CamKing wrote:With the 4412 and performer intake, I'd normally run a shorter exhaust lobe, but with the stock exhausts, I'd go with a single duration profile.
CamKing wrote:With the 4412 and performer intake, I'd normally run a shorter exhaust lobe, but with the stock exhausts, I'd go with a single duration profile.
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[i]Those of you who think you know it all are particularly annoying to those of us who do[/i]- Penske garage sign @ Indy circa '71
I'm not sure about the exact compression ratio. Around 11.5 I believe. 4.030 bore, zero decked, 5cc valve reliefs, .041 gasket, Vortec heads flat milled .035. We can't angle mill.
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Sorry but that motors compression ratio is 10.7 to 1 and it could be less. Its swept volume is 727.35cc in a 75 cc compressed volume. So its 802/75 = 10.69 or 803/76 =10.57 To be 11.5 to 1 it would have to have a 69.3 cc compressed volume. You would need to flat mill the head .075. Why do people alway think the comp is higher than it really is? I get alot of customers who say "I have a cast flat tops 350 with double bumps and its 10 -1" No sir its 8.5 because your 4 relief pistons are .040-.045 down the hole plus your 35 year old head probably have sunk seats and with that big cam your running, you might as well save your money and run regular gas.
Yolu allowed 1.125 inches for a spacer and gaskets. I use a standard 1" phenolic 2bbl adapter mounted centered.
A guy in town did some dyno testing, he said the Wilson tapered spacer was worth 2 hp. For the price I passed. The only dual plane intake he tested that was sensitive to fore and aft placement was the Torque Link intake.
