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flow 285 otb,







FWIW, in the stealth vs eddy rpm flow test that that dwayne (fast68plymouth) did when the stealths first came out, neither the stealth nor eddy heads came near touching 285cfm OOTB. In that test, at .300 lift and below, the stealths had a slight few cfm edge over the eddy heads, after that the eddys had about a 10cfm lead, peaking at 276cfm at .600 lift. From what I'm told, a clean up of the bowl to valve seat transition on the steath heads really helps bring them up to par with the eddy heads.

But hey, everyone's flow bench is different. Some seem to put out some really 'happy' numbers!


you can also pick up those #s by doing nice unshrouding of valves with no other work and remill to get the same size chamber.but scrap 452 iron heads must be better...with ports bone stock, little bowl cutting/blending and 5 angle valve job #s get better with stealth heads.and full ported will flow 300-320 intake at useable lift of 600,does this not prove its a great stock looking replacement head?



The stealths are a good head, I own a set of the first run stealths. And yes of course their flow comes up nicely with porting. The CNC job that Jeff at modern cylinder head does will bring them up to a nice 300cfm flow. But that's an extra 1k. My point is the stealths absolutely do not flow 285cfm right out of the box. The edelbrocks don't even flow 285cfm OOTB. The flow test that Dwayne did when they first came out several years ago:

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4.375 bore, 28" test pressure, radius plate on intake, no tube on exhaust:

average flow for #5 and #7 cylinder

lift----I/E
.100--63.8/49.0
.200-140.5/104.1
.300-207.8/139.7
.400-239.2/164.6
.450-248.1/172.5
.500-256.1/177.8
.550-261.5/182.6
.600-265.3/188.2
.650-267.3/191.5
.700-267.3/195.8

here is an OOTB E head i tested recently, also the average for a left and right cylinder:

lift----I/E
.100--66.1/50.8
.200-138.3/105.4
.300-203.8/140.5
.400-243.1/163.6
.450-258.0/170.4
.500-265.7/178.6
.550-272.3/185.3
.600-276.5/190.3
.650-276.1/194.6
.700-275.7/197.3