Page 4 of Performance Parts 2007 by Melling

10555c the same as the 10552c but with increase in volume of 25 over stock volume pump uses 3/4 bolt on or 3/4 press in screen for racing applications only the 10555c uses the high pressure spring only recommend new 12550 drive shaft 10990 performance upgrade for m-99hv uses 3/4 press in screen must use 12550 drive shaft 25 increase in volume over stock pump the drive and idler shafts have been extended to allow for additional support in the cover eliminating dynamic shaft deflection at increased rpm levels the cover is doweled to the pump housing to assure alignment of the shaft bores screw in plug retains relief valve spring instead of pin all bolts are self locking socket heads the housing and cover are cnc machined and manganese phosphate coated manufactured with pink spring installed for higher pressure to change pump to lower pressure use supplied spring 10990c the same as the 10990 uses 3/4 press in screen features the addition of anti-cavitation grooves machined in the body and cover the grooves reduce cavitation effects in high rpm applications pressure will be reduced at idle for racing applications only the 10990c uses the high pressure spring only uses new 12550 drive shaft 10050-825 aluminum billet oil pump for 8-1/4 deep pans pump features a lightweight billet 6061-t6 aluminum housing cover with a protective anodized hardcoat the high volume gears are also coated the chrome-moly drive shaft has been extended pump shafts have been extended into the cover for support the pickup screen has been integrated into the pump body and features a stainless steel wire mesh this pump has multiple pressure settings and is cnc manufactured to exacting tolerances and surface finishes the supercharged inlet allows for improved performance at high rpm s includes 12550 chrome moly intermediate shaft stud kit and +10 and 10 relief springs for racing applications only new item new aluminum billet pump gm big block v-8 performance oil pumps part no 10070-800 10774 10775 10770 10778 10778c volume increase 25 0 0 25 25 25 inlet dia inches 3/4 3/4 3/4 3/4 3/4 3/4 coatings anodized mag phosphate mag phosphate mag phosphate mag phosphate mag phosphate shaft support xxxx screw-in valve plug xxxx provision for screwin screen anticavitation grooves x 10770 performance upgrade for m-77hv uses 3/4 press in screen must use 12770 drive shaft 25 increase in volume over stock pump the housing and cover are cnc machined and manganese phosphate coated the lower pressure spring is included to reduce pressure if desired 10774 performance upgrade for m-77 uses 3/4 press in screen must use 12770 drive shaft standard volume oil pump the housing and cover are cnc machined and manganese phosphate coated the lower pressure spring is included to reduce pressure if desired 10775 uses 3/4 press in screen must use 12770 drive shaft standard volume oil pump the housing and cover are cnc machined and manganese phosphate coated manufactured with pink spring installed for higher pressure to change pump to lower pressure m-77 use supplied plain spring.

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