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Old 12-03-2011, 08:45 PM
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bare Large port bowties vortecs casting # 371c

hi all, ive been talking about a mild street performance build 400 sbc, cheap and low cost, the cylinder heads i have now. Have been recomended to me before, for low dollar performance cylinder heads. I took it very seriously, looked up prices and decided to take a shot at these heads, and though they were not meant for flat tappet cam matching performance, theyr the new roller cam/ roller rocker hi perf springs and things. I got them bare. Plan on buying the valves from the same place i got my heads. Crate engine depot here in Illinois, surprised as how much cheaper they are. And shipping was quick.
But anyways other than that i plan on matching the cam instead of doing something like a thought up cam before. Thinking i could just build a motor and argue like an idiot, my apoligies to all that have corrected me.. I am sadly mistaken.
And alot have told me these heads werent worth high performance applications. People tell me to set my eyes on some AFRs for what power i was seeking. But recently found out the intake side flows better then the 'racing' afrs at .550 lift(ill get to that if anyones curious of the point) Theres a flow sheet on SBC cylinder head info, AFRs and stuff should google and look. The sheet i got with the heads says May 2007 GM revised the 371 casting to improve flow there 215 cc intake runners, 84 cc exh.(revised) Ports and the 65 cc heart shaped combustion chamber.. The heart shaped chamber really defines a unique slogan "The Heartbeat of America" valve covers...
BUT anyways lets take a look at these heads.

This sheet also lists all the P/Ns like the valves. Im going cheap through the crate engine depot cause of coarse there prices are much better than summits.

Notice this sheet also explains the five angle valve grind the heads come with. Its pretty wild, didnt expect this at all....
Has anyone got any clue as to what the flow charts from .100 all the way up to .500 inch lift on the 371s? If so thank you. This sheet only provides lil info on lift/flow (wet flow) at .550 281 CFM
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Old 12-04-2011, 04:46 PM
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I cant speak of the 371 casting but I have the 906 casting heads and found a lot of power out of the comp cams 288R grind. 12 to 1 compression static, 355 bore. Something to the tune of 450 horse, all motor.
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Old 12-04-2011, 05:02 PM
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Check Stan Weiss's site, has about any Head you can imagine.
http://users.erols.com/srweiss/tablehdc.htm
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Old 12-04-2011, 05:11 PM
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302, would you please post the entire casting number? Thank you.
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Old 12-05-2011, 02:31 AM
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casting number is 25534371.
Im not for sure on my claims before about comparision to afrs, that flow data about the afrs could be old or not used as real proof., notice ive googled these heads and no ones metioned these kinda 371s except a few that were intrested in them 4 years ago...
If im not mistaken.
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Old 02-23-2012, 04:35 PM
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Stainless steel retainers, manleys swirl polished race series valves 2.00,(they fit right in and cost less then GMs) and im looking at a matching 1.56 exhaust valves from manley, (also cheaper). Comps 3/8s raised guide plates. Plan on a pocket port by a pro, which should boost flow about another 10%.
Roller cam springs, what kinda springs should i be looking at? Im also looking at roller rockers, ik im not reving to the moon, but it also keeps wear out of the guides. I just want something i can stomp on and be dead reliable
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