Page 50 of Offenhauser Automotive Performance Products by Exeter Auto Supply

inn offenhauser s guide to proper carburetion engine c.i.d nverted tcs volume]1 as base 1figures t t is cemplicated cornputer f o rmula wa s deengi ne capacity and c arburetor flow co1 s igned t o aid ~n the proper offenhauser manil old and carburetor selectio n refe!r also to the offer ihauser intake manif old alan+i r -i .3 a we i s hart on page 4 additional carburetion enf~rma m cm ,n.g for engirles capable of dual quad manifolds double 1 above carbureti on guide is based 1on single quad mari ifold apl he t he cfm listed for v our applilcation tising 4 ha 1o find the correct size carburetor in cubtc feet to use rwith an 0lffenhausf ?r manifo id look d own the r:olumn marked engine t c.i .u.i f n d the djsplacernenf nearesl to your engine then look across the column marked e n g n e r.p.m locate the maxmum r.p.m capability of your engine and where the englne c.1.d and engine r.p.m intersect i s the minimum size carburetor in c u b c feet t o use on your engine for street or strlp applications example a 350 c.i.d chevrolet capable of 6500 r.p.m would require a mrnirnum carburetor size of 658 cfm rounded off t o 650 cfm a 350 c.i.d c3evrolet modified a n d cap able of 8500 r.p.m using an offenh auser d u ai i d setup would requ~re each folur barrel carburetor tohea rnlnlmum of 861 cfm rounded off t o 850 ca,rbyireti4 in order to obta n of the perform lnce engirleered int ale offered for your assistance ana conver ng tips user 3eio manifc 3llowing tuning tips ar,e 7 lnstall~ng carburet0 too large a size or a of due to over-carburetion select t h e prloper carbl 4 c 2 carburetor jettinq has t o be altereb +m i average sugge ~d j e t siz e changes to corn1 t housandtli leaner for each 1000 fee t increas s temperature increase above a /u average 8 ng t o properly mat ~r the manifold an1 un8 e of engir7 will reslu l t in poor performlance e ccrmb~natl n from the endo sed listinsis o peratures uull ,zrences i n altitude l r temper ature an i altitude are as f c,ilows ptpprexim t e l ythre de above sea level one ill thousand,ths leaner for each 30 degre 4i changt!s in cam timing t c1 the racirif type alr;o affect c:arburetor size and jetting h igh lift an d long du ration carns need tci run r icher thari stock f ot chanqe r s also telnds to 1 in o u t thr carburel,ion from stock so that the type of headers wi ic also alter the am note when any high performance or custo rn equiprnent i s installed ori any eng ine intentlecl for u e an pub lic streets and i .n le nnpratlr +ha oh11rfp v hfghways b e sure to reconnect all of t h e emlss ion control devlces comnl t ~h vfnr

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