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Old 04-15-2017, 09:55 PM   #61
HP HUNTER
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Talking Re: 1971 Buick 455 GS F/SA G/SA Build

I finally got the exhaust side of my heads done. Although I'am not sure I have this right, so I have questions. On my BBC builds with conventional camshafts I've always wanted lazy low lift flow then have it come on after .300 lift and take off, this has always worked well for me. On my Buick I gained around 12 CFM @ .200 and 12 CFM @ .300 and about 10 CFM @ .400 and finally 9 CFM @ .466 peak lift, will this help me or hurt me?
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Old 04-17-2017, 08:59 AM   #62
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

I almost didn't answer this because there's not enough info to make a valid response ( again, where are the .100 flow figure improvements on intake & exhaust). Also, i don't know what was done to improve the intake or exhaust flow. You are definitely going to have a (seemingly) wilder cam with low lift flow increase. You will have more reversion, true, but, in my opinion, you are going to see a substantial performance increase. Ron.
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Old 04-17-2017, 08:07 PM   #63
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

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Originally Posted by R. Thorne View Post
I almost didn't answer this because there's not enough info to make a valid response ( again, where are the .100 flow figure improvements on intake & exhaust). Also, i don't know what was done to improve the intake or exhaust flow. You are definitely going to have a (seemingly) wilder cam with low lift flow increase. You will have more reversion, true, but, in my opinion, you are going to see a substantial performance increase. Ron.
Ron, I will send you the flow numbers in .050 increments, I'm actually scared to to see the increase @ .100 lift on the exhaust. Intake to exhaust flow is roughly 67% @ peak lift.
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Old 04-20-2017, 05:38 PM   #64
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Default Re: 1971 Buick 455 GS F/SA G/SA Build

Sorry for delay, Mark. As Mike Taylor, Adger Smith, and others have said total and/or average flow is more important than peak lift flow increase at the expense of lower lift flow. I did not see anything exorbitant in your low lift exhaust numbers. Frankly, there is probably more potential low lift available. There are, of course, ways around the reversion issue if that is what concerns you, but I don't think you will need it. In short, yes, IMO, it will help you. Ron.
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