· accel s new 12-volt breakerless 6.5 amps dwell control module · cnc- ... machined billet 6061-t6 aircraft grade aluminum housing · ... tappet or hydraulic roller camshafts · race-proven high output magnetic pick assembly · ... 52100 all std deck height chevrolet 8 cylinderengines except 348 409 engines 52102 ... 1955-81 pontiac 301 326 350 389 400 421 428 455 ... engines except 1973-74 super duty 455 engines 52103 1964-90 oldsmobile 260 307 330 ... 350 400 403 425 455 engines 52108 holden 8 cylinder 253 304 308 ... engines 52200 1958-76 ford 332 352 360 390 410 ... 427 428 fe engines 52201 1962-80 ford 221 255 260 289 302 ... 302 boss engines 52202 1968-95 ford 351c 351 boss 351m ... 400 429 460engines 52204 1969-80 ford 351w engines 52300 ...
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ignition tune up parts make year model engine notes cap rotor cap rotor kit heavy ... cont electronic distributors 4 cylinder1978-76 400 6.6l eng all models w/lean ... burn 400 6.6l eng all models exc lean burn ... truck electronic distributors 4 cylinder 1995-90 153 2.5l eng voyager w wo/ ... 1987-84 1562.6l eng voyager ... 6cylinder 1989-87 181 3.0l eng voyager ... 130319 8326 · 8 cylinder 1983-81 318 5.2l 360 5.9l eng all ... 120326 130319 8320 8321 pontiac distributorless ignitions 4 cylinder ... can 1991-87 151 [r 2.5l eng 6000 151 [u 2.5l eng grand ... 151 [r 2.5l eng fiero 6cylinder 2003-99 207 [e 3.4l eng grand ... can 1991-88 189 [t 3.1l eng 6000 coil pack .140017 ...
hei distributor · for chevrolet v8 engines262-400 and 396502 · cnc-machined cast ... 356t-6 aluminum housings · direct plug-in ... street perf dist w/mallory 29212 race in-cap coil ... ignition module chevy v8 74 85 66941bkc .black cap 119. ... 99 66941bc .blue cap 119. ... 99 66941rc .red cap 119. ... have only a single bushing 66983r red ford 351 windsor 154. ... 99 66980b blue ford 351c-400m-429-460 209 ... .99 66980bk black ford 351c-400m-429-460 209. ... 99 66969r red ford 62 83 260 289 302 154.99 66969b ... blue ford 62 83 260 289 302 154.99 66969bk ... black ford 62 83 260 289 302 154.99 p c d ch ...
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connection 140035 1989-04 ford edis 6cylinder 83.99 140036 1998-00 ford ... edis 6cylinder86.99 140018 1998-99 ford ... edis 4 cylinder 54.99 140028 1999 1/2-04 ford ... edis 4 cylinder with european contacts ... breakerless electronic ignition system $69.99 40,000 volt ignition coil replaces most ... 1186lsc126191261 ii applications 6 cyl gm cars and trucks 1961-1974 8 cyl ... -58 dual points 8 cyl chevrolet 1955-566 cyl most ford cars and trucks 1968-1974 ... most 1960-1972 dual points 1361a91361a6 cyl chrysler cars and trucks 1960-1972 ... deere dist #ibt-4101l r s 1163a91163a6 cyl john deere dist #11126241112466 ... 3385721 ml183 9ml-183 replaces unilite #605 module $69.99 $104.99 more available ...
price chevrolet 283-400 small block pontiac v8 ford 289-302-351 gold tone finish ... 920g 603 3/8 26.97 chevrolet 396-454 big ... block pontiac heavy-duty bright zinc finish 921g 670 ... stamped steel rockers black finish 922g 6105/16 44.97 for aluminum rocker arms ... chevrolet 283-400 small block pontiac v8 ford 289-302-351 ex 351c gold tone ... /8 35.97 chevrolet 396-454 big block pontiac heavy-duty black finish 924g 544 7/16 ... pushrods 599.97 pontiacrp1451-16pontiac1965-1979326-455 v8 ... 169.97rp1452-16pontiac1965-1979326-455 v9 1.65 magnum ... 1441-kit oldsmobile 350 and 403 v8 1.6 magnum rockers guide plates studs high ... 255.97 1442-kit oldsmobile 455 v8 1.6 magnum rockers guide plates studs high ...
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ignition module chevy v8 74 85 66941bkc .black cap 114. ... 97 66941bc .blue cap 114. ... 97 66941rc .red cap 114. ... vehicle rapid acceleration typical race profile cam 66996 h chevy sb bb billet ... dist 141.97 66997 m chevy sb bb billet dist ... 99.97 66998 l chevy sb bb billet dist ... 141.97 669916699366995 100 new gm v8 late model distributor ... for 87 95 gm trucks and 87-93 cars 66938rc66939bkc red cap polished 162.97 ... 80 high performance blue-printed design 66965 blue cap 126.97 distributors hei ... a minimum of 7500 rpm they also produce 67 more energy in the coil and is 45 ... great module and coil that have been engineered to work together to produce these ...
chevy ls series the ls engine family tree everything you wanted to ... but were afraid to ask ls heritage the engine family commonly called the ls series ... with cast-in provisions for fuel-saving cylinder deactivation larger displacements and ... continued to refer to its modern v-8 engine family as gen iii and gen iv but to the ... tremendous performance potential of the engines every engine based on the platform is ... nicknamed ls the range of production engines from the ls platform is wide on the ... truck side iron-block engines have included 4.8l and 5.3l versions as ... well as all-aluminum 6.0l and 6.2l premium engines car engines include 5. ... 3l 5.7l 6.0l6.2l and 7 displacementsincluding some ... -drive .0l gen iii/iv small-block crate engines part number 191656281780126717801268 ...
Ignition Rev limiter to protect your engine. Adjustable from 4,000-8,000 RPM ... Two wire easy hookup CARB E.O. D-225-67 50 state legal 750-1700 Fits 1957-74 ... Ford 8 Cyl. . . . . . . . . . . . . .$69.99 750-1710 Fits 1957-74 Chevy 8 Cyl ... . . . . . . . . . . . . .$69.99 Ignitor Ignitor II Applications 1162A ... 91162A6 Cyl. GM Cars and Trucks, 1961-1974 ... ** 8 Cyl. Chevrolet 1955-561261912616 Cyl. Most Ford Cars and Trucks, 1968- ... 1960-1972 Dual Points 1361A91361A6 Cyl. Chrysler Cars and Trucks, 1960- ... dist #IBT-4101L, R, S 1163A91163A6 Cyl. John Deere dist #1112624, 1112466 ... ML183 9ML-183 Replaces Unilite #605 module $69.99 $104.99 More Available! ... counter clockwise for Oldsmobile and Pontiac. They cannot be interchanged. Ignitor II ...
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, Electric Hypertech Hyfire VI (6) Series Ignition Systems HYFIRE VI ... , turbocharged and nitrous apps. 685 ... crank triggers (exc. hall effect) 6852M . . . . . . . . . . . . . . . .$119.99 ... crank triggers (exc. hall effect) 6853M ... millijoule sparks burn everything from race gas to alcohol. Multi-sparking CD ... Includes rubber shock mounts 7220 8 cylinder . . . . . .Call Two Step Module ... plugged into the rev control on yourMSD 6AL, 7AL-2 or other MSD ignition with a ... Call MSD 6AL The #1 selling performance ignition in ... Fits most foreign and domestic vehicles 6420 ... Call MSD 6A Multi-sparking, CD Ignition improves ... 20 degrees of spark duration Fits 4, 6, and 8 cylinderengines CARB E.O. ... Approval 6200 ... Call MSD Digital-6 Plus Advanced digital technology makes ...
fit chevy small block and big block engines these 100 new distributors have all the ... reliable components of the 66940 but they also include a highpower 50, ... a perfect affordable gift for the pro-racer would-be racer or anyone who just likes ... battery life and it s affordable fun 67025c perfect launch practice tree fits 55 ... 82 chevy small block and big block engines no rebuilt components 100 new it has a ... rotor except where otherwise specified 66940 tan cap 66940c tan cap 66940r red ... cap 66940rc red cap 66940b blue cap 66940bk black cap 66940wo no cap or rotor gm ... with external coil such as proform p/n 66937c comes with small-sized premium quality ... look or with an unpolished factory-look 66941r red cap 66941rc red cap 66941b blue ...
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engine builders tools universal piston ring ... heavy-duty bench top spring testers cylinder head work stands adjustable easily ... size and tap into bore it s that easy 67725 universal piston ring installer heavy- ... available at powerhouseproducts.com 66774 spring tester 300 lbs spring pressure ... 66775 spring tester 700 lbs spring pressure ... our heavy-duty cylinder head work stand is great way to hold ... your cylinder heads above your workbench while ... proper height and maintain stability 66483cylinder head work stand adjustable ... a slideshow presentation on this tool 66773 rod splitting fixture no more banged ... oil pickup tube for chevy big block engines66480 chevy b/b oil pump pick-up ... tool easily modify your heads for 1.6 ratio rockers with this handy pushrod ...
in hopping-up the flathead ford v-8 engine in his own car today over fifty years ... s commitment to quality control and engineering excellence is reflected in their ... arms and valvetrain components hi-6 ignition · fully digital high output cd ... in · lightweight only 2.15 lbs part no 6000-7100 new pro-curve billet distributor ... firing accuracy for street or all-out race accurate to .5 degrees at all rpm ... -1800 1000-1801 1000-1802 1000-1803 hi-6 ultra ignition · dual stage rev limiter ... input · compact low profile part no 6000-7200hi-6s ignition · inductive ignition · ... adj in 100 rpm increments part no 6000-7500 application chevy v-8 sb bb 55-96 ... cap chrysler rb 426-440 small cap hi-6 series all digital performance cd ... · capacitive-discharge ignition for race/street · new hi-6 delivers higher spark ...
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25 years our dedication to research engineering and testing result in products that ... thundersport spark plug wire accel has engineered a way to put their race winning 300 ... ferro spiral race wire core into a much smaller spark ... t go description part no universal 8-cylinder wire set 90° spark plug end universal 8 ... -cylinder wire set 180° spark plug end 7541 7540 ... chevrolet cars 74-79 all w/hei 350 58-65 all 348 409 64-69 all wire over valve ... cover 283 327 68-73 all wire over valve cover 307 70-74 all ... wire over vc 400sb 74-76 all w/hei 400 67-69 camaro z28 wire over vc 302 76-79 ... application part no 5041 5041 5040 5040 6 8 cylinder 90° 5/8 hex plug w/male ... 5.0/5.7l 5114 chrysler/dodge/plymouth 64-72 all 273 to 360 5047 73-76 dart swinger ...
chevrolet small block v-8 v-6 stock and performance cylinder heads ... port and bolt hole locations engine cid 265-283262-400262-400262-400262 ... 305-350 305-350 350 305-350 346 13 14 engine liters 4.3-4.64.3-6.64.3-6.64.3-6.6 ... 4.3-6.64.3-6.64.3-6.64.3-6.64.3-6.64.3-6.64.3-6.64.3-6.6 5.7 5.7 5.0-5.7 ... 8 8 8 8 8 8 8 8 8 8 8 8 8 8 years 1955-67 1955-91 1955-91 1955-91 1955-91 1955-91 ... stock port stock port stock port sml race port sml race port sml race port med ... race port med race port lrg race port lrg race port ext lrg race port ... ext lrg race port lt1 vortec design port tpi upper ... throttle body base gasket performance cylinder heads non-conventional port and bolt ...
v8 qtm rm-330 sbc front motor mount engine components moroso engine cleaning brush ... linkages a common result of excessive engine movement these solid steel mounts ... each of the brushes in these moroso engine cleaning brush sets is designed for a ... can be used on crankshaft oil holes cylinder heads etc their bristles are made of ... not scratch set includes 12 brushes mor 61820engine cleaning brush kit $27.50 magic ... epoxy $19.50 extreme pressure lube mor 62500 mor 62510 mor 62515 mor 62520 mor 62530 ... mor 62610 mor 62630 mor 62635 block mount sb chevy oem #3990914 block ... #2536121 block mount sb/bb chevy oem #6258154 frame pad sb/bb chevy use w mor-62510 ... frame pad sb chevy use w mor-62515 frame pad sb/bb chevy 93-97 camaro/ ...
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msd 8173 msd 8190 msd 8191 msd 8193 6_pin weathertight conector 2-pin ... computer circuitry to drop spark one cylinder at a time until your engine is at or ... below its maximum rpm those cylinders are then fi red on the next cycle to ... rough stuff this unit works with msd 6t6tn6hvc ignition systems included are ... 6,000 7,000 and 8,000 rpm plug-in modules and ... msd s rpm module selector msd 8738 msd 6t6tn6hvc ignitions $93.70 rpm module ... 3,000 3,800 4,000 4,800 5,000 5,800 6,0006,800 7,000 7,800 8,000 8,800 9,000 ... four pins msd 8824 two pin connector $6.00 cvr protorque starters state of the art ... ford 351m 400 429 460 chrystler sb bb pontiac olds v8 350 400 455 reverse mount bert/ ... supercharged or just hard to turn your engine over how about 3 1 horsepower and a 4 ...
performance automotive warehouse 818 678-3000pawengineparts.com ssi performance ... 112 hyd hyd hyd hyd hyd hyd hyd hyd $64.95 $64.95 $64.95 $64.95 part no duration ... 472 214-224 280 290 .472 .496 hyd hyd $64.95 hyd hyd $64.95900-16vs-270-16900-16 ... 10364 10355 ssi-11335 ssissi hyd hyd $69.952083-16vs-410-16 hyd hyd $69.95 2083- ... 16vs-410-16 hyd hyd $69.952083-16vs-410-16 hyd hyd $64.95 hyd ... hyd $64.95 hyd hyd $64.95 hyd hyd $69.95 hyd hyd $69.95 hyd hyd $64.95 hyd hyd $ ... 64.95 11339 8 8 ssi-10329 ssi 900-16 vs-320- ... -425-455 1967-1985 10335 ssi-10336 ssi pontiac v8 301-316-347-350-370-389-4 00-421-428 ... -controlled vehicles/motor vehicle enginespre-1966 model years products bearing ...
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performance automotive warehouse 818 678-3000pawengineparts.com rocker arms $uper $ ... you get the maximum hp from your engine also reduces wear on valve tips comes ... excellent for street/strip racing engines where stamped steel rockers are ... 129.95 set 1.6 sb chevy 3/8 stud 1955-1986 ... arms are a secret weapon in street and race applications they re more durable than ... valve stem and guide wear so your engine makes more power and stays in race- ... v8 265-400 chevy v6200-262 chevy v660° 173 chevy v660° 173 chevy v8 265-400c ... 350-403 oldsmobile v8 400-455 pontiac v8 265-455pontiac v8 265-455 rocker ... 3/8 3/8 7/16 3/8 3/8 7/167/161.6 1.52 1.52 1.52 1.601.61.6 1.72 1.72 1 ...
pin dia .927 sb chevy 350 lj length 6.000 bushed pin dia .927 sb chevy 350 lj ... length 6.000 press pin dia .927 sb chevy 350 lj ... length 6.200 bushed pin dia .927 bb chevy 396 402 ... 427 454 502 length 6.135 bushed pin dia .990 7/16 rod bolts ... bb chevy 396 402 427 454 502 length 6.135 press pin dia .990 7/16 rod bolts ... bb chevy 396 402 427 454 502 length 6.385 .250 bushed pin dia .990 7/16 ... bolts sb chrysler 318 340 360 length 6.123 standard length bushed pin dia .984 ... sr6760p rb chrysler 413 426w 440 length 6.760 standard length press pin dia 1.094 ... ford 351w 420 stroker rod length 6.200 special stroker rod length bushed pin ... journal par-sr6605p ford 429 460 length 6.605 standard length press pin dia 1.040 ...
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/302 distributorless ignition system v-6 v-8 universal set 9mm blue wire 45° ... boot for-m-12259-c302 48.95 v-6 v-8 universal set 9mm black wire 45° ... boot for-m-12259-r460 48.95 1996-984.6l 4v mustang 9mm red wire set 45° long ... wire sets for common motorhome engines msd 8.5mm wire features the lowest ... ensures that more spark makes it to the cylinder to burn the fuel completely the outer ... warranty made in u.s.a fits amc 6066 all v8 ford/mercury 6776 all v8 ford ... truck 62 all f-100 f-250 international 75 77 ... traveller lincoln 75 76460 lincoln 61 74 all v8 per-708104 ... 43.95 95 1996-984.6l 4v mustang 9mm blue wire set 45° long ... boot for-m-12259-c464 119.95 4.6l 2v f-150 truck 9mm blue wire set 45° ...
in hopping-up the flathead ford v-8 engine in his own car today over fifty years ... s commitment to quality control and engineering excellence is reflected in their ... developing the z-cams for popular v-8 engines the z-cams are designed to increase the ... seat but only after maximum flow and cylinder filling has been achieved z-cams ... -2 1200-5200 1600-5400 1800-5800 2200-64003000-6800 8.0 to 9.5 8.5 to 10.0 8.75 ... -268-2 z-274-2 1200-5000 1800-56002200-6000 8.0 to 9.5 8.75 to 10.5 9.5 to 10.75 ... -12 ig zhr-296-2s-12 ig 1600-56002200-6000 9.5 to 11.0 10.0 to 11.5 139011 139021 ... though the musclecar era ran for only 6 or 7 years these uniquely american cars ... mechanical flat tappet 435 hp 427 ci pontiac v8 hydraulic flat tappet 400 hp ram air ...
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in hopping-up the flathead ford v-8 engine in his own car today over fifty years ... s commitment to quality control and engineering excellence is reflected in their ... arms and valvetrain components gold race extruded aluminum roller rocker arms ... in sets description part no chevy sb 1.60 ratio 7/16 stud increased ratio w/ ... enlarged stud dia clears 1.630 od spring v8 55-87 262-400 stock ratio ... ratio standard stud dia ford sb v8 s 62-94 221-302 351w 1.60 ratio 3/8 stud ... ratio standard stud diameter ford v8 s 69-82 351c 351m 400 boss 302 351 bb 68-93 ... common use of stud girdles for racing engine applications most importantly the crane ... are easily installed and require no cylinder head machining or modifications for ... description part no chevy v8 262-400pontiac-brodix w/standard rocker arm stud spacing for ...
vehicle rapid acceleration typical race profile cam. 66996 (H) Chevy S/B B/B ... Billet Distributor.......$266.5066997 (M) Chevy S/B B/B Billet Distributor ... ......$266.5066998 (L) Chevy S/B B/B Billet Distributor ... as above, but without vacuum advance: 66999 (H) Chevy S/B B/B Billet Distributor ... .......$266.5067019 (M) Chevy S/B B/B Billet Distributor ... ......$266.5067020 (L) Chevy S/B B/B Billet Distributor ... with external coil (such as PROFORM P/N 66937C). Comes with small-sized, premium ... , or with an unpolished factory-look. 66938R Red Cap, Polished ... ......................... $179.09 66938RC Red Cap, Polished ... ......................... $180.91 66939BK Black Cap, Unpolished ... ....................$160. 80 66939BKC Black Cap, Unpolished ...
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Engine Builders Tools 20 Some items may not be ... , and tap into bore. It's that easy! 67725 Universal Piston Ring Installer ... a slideshow presentation on this tool! 66773 Rod Splitting Fixture ... out the springs with heads on the engine. This heavy-duty, stud-style compressor ... . Works with Chevy SB BB, Ford, and Pontiacengines. 66848 Economy Valve Spring ... Tool Includes 0-1.000" Dial Indicator 66962 (0.001")! With O-rings on each end to ... .) and Ford (.875" dia.) applications. 66838 GM/Ford Cam Checker Tool ... ....................$72.5 6 Heavy-Duty Bench Top Spring Testers ... available at powerhouseproducts.com. 66774 Spring Tester, 300 lbs spring pressure ... .....$283.17 66775 Spring Tester, 700 lbs spring pressure ... oil pickup tube. For Chevy big block engines. 66480 Chevy B/B Oil Pump Pick-Up ...
starts proven for over thirty years in race cars offroad vehicles national rental ... compatible with flame-thrower ii 0.6 ohm coils and other low resistance ... 1381a 1481 1483a ho-181 1847v 1581 1582 cylinder 8 8 8 4 6 8 8 8 8 6 8 8 6 8 8 8 8 4 8 8 ... 009 dist automotive applications most 62-74 gm vehicles most 32-56 gm vehicles most ... /buick lobe sensor type most 57-74 olds/pontiac lobe sensor type most 49-74 ford most ... 57-75 ford dual point dist non/vac most 62-72 mopar single point most 62-72 mopar ... single point 68-78 ihc w/holley dist 64-83 ihc w/prestolite dist 74-81 ihc w/ ... holley gold box dist 68-79 volkswagen fits entirely inside the ... ii flame-thrower ii 45,000 volt coils 0.6 ohm oil filled canister coil 0.6 ohm ... built in adjustable rev limiter for 4 6 8 cylinderengines adaptive voltage ...
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in hopping-up the flathead ford v-8 engine in his own car today over fifty years ... s commitment to quality control and engineering excellence is reflected in their ... arms and valvetrain components hi-6 series performance cd ignition plug-in ... -discharge ignition for street · new hi-6 delivers higher spark-gap current than ... cd ignitions · multi-spark cd for race street nitrous-oxide supercharged and ... needed application multi-spark cd for race/street 10 to 14.5:1 compression ratio ... multi-spark cd for race/street up to 14.5:1 compression ratio ... hi-6dsr cd ignition with dual stage rev ... firing accuracy for street or all-out race accurate to .5 degrees at all rpm ... 1000-16001000-16021000-1604 part no 6000-64406000-64006000-6424 application chevy v ...
here include 1968 yenko camaro 1966pontiac gto 1969 dodge charger 500 19631/2 ford ... 427 galaxie 500 fastback 1973 pontiac super duty trans am 1966 l79 chevy nova ... is strictly for the small-block ford engine it is a guide on giving your small- ... other small-block at the starting line engine building techniques are included for ... street machines drag racers tow vehicles for just about any ... power this book covers 351w and 302 engines contents include how to rebuild short- ... track engines claimer class special class and ... racing b132814 ea 18.95 ford engine overhaul manual complete step-by-step ... for rebuilding the most popular ford engines includes the 255 260 289 302 351c 351m ... 360 390 400 428 429 and 460 cubic inch engines everything you ll need to know in one ...
in hopping-up the flathead ford v-8 engine in his own car today over fifty years ... s commitment to quality control and engineering excellence is reflected in their ... high rpm range performance rpm range 6500 to 7000 hi intensity hydraulic lifters ... designed for more compression than the engine actually has the result is that the cam ... and cam lift maximum rpm potential 6500 to 7000 rpm mechanical solid lifters ... cam and require installation into an engine with an adjustable valvetrain the ... rpms when properly matched with cam and engine components application chevy 55-95 v8 ... 262-400 chevy 65-90396 454 502 ford 62-95 v8s except fe chrysler v8s except pre ... 68 blocks pontiac v8s except 77-81 265 301 buick/olds ... 95 v8 262-400 chevy sb horizontal chevy 65-90396-454 502 ford 62-95 v8s except fe ...
performance automotive warehouse 818 678-3000pawengineparts.com balancers dampers ... of the air-fuel mixture each time a cylinder fires the connecting rod pounds the ... energy to be dispersed throughout the engine multiply this by the number of ... cylinders with variations in engine speed and you have what is commonly ... the accessory drive pulley · excessive engine vibration · slipping squealing drive ... -da3071 application chevy 1968-1973 307 6-1/4 dia gmc-3896903 chevy 262z 305 vin h ... 6-3/4 dia camaro 1987-1992 350 vin 8 ... 350 1969-1992 350 8 dia car/truck gmc-6272222 chevy 350 1993-1997 7.5 dia serpentine ... belt no hub chevy 400 sb 8 dia gmc-6272225 chevy big block 396 427 8 dia gmc- ... 3.9 v6 1978-1991 chry-4173443 ford 302 6.5 dia raised pulley location 28 oz ...
pistons ford pistons oldsmobile pistons pontiac pistons wrist pins engine kits probe ... engine kits scat cranks probe cranks scat ... cranks/rods return policy 2-3 4 5 6-11 12 13-14 13-21 22-24 25-35 36-3736-37 ... 38 39-6162-79 80-81 82-87 88-89 90-92 93-96 97 98 99 ... in computer aided solid modeling and engineering software to develop all of our ... the latest cmm technology master engine builders and a dedicated balancing ... balance 3 includes new thrust washer tw-611s 20 internal balance 4 fits dart ... 5 lightweight 22 cleveland/svo mains 6 3 valve 23 24 tooth reluctor 7 big bore ... 24 includes new thrust washer tw-611s 8 uses cleveland head 25 super cobra ... metal 11 will not fit scj or kaase cylinder heads 28 includes reluctor wheel 12 ... 30 will not work with brodix track 1 cylinder heads 14 will not work with twisted ...