Afr 210 Lt4 With 76cc
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Joined: May 2001
Posts: 7
From: Ancaster, Ontario, Canada
Afr 210 Lt4 With 76cc
I am looking at installing the afr 210 for LT4 intake heads on my 350 short block which has the stock compression pistons. Will the 76cc reduce my compression and by how much. If it does what are my options with this head. If I reduce the deck thickness will I have to change the LT4 intake flange angle or height.
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Joined: Oct 2002
Posts: 6,518
You need to mill those heads to fit.
Stock chambers are 56cc's, usually on a stock bottom end I recomend ported LT1's or LT4's. The 76cc will kill the compression ratio and since the runners are larger that's a bad combo for throttle response.
If you mill the head, you need to mill the bottom of the intake to match the runners, if you angle mill the head then you need to mill the edge of the intake to match it.
Bret
Stock chambers are 56cc's, usually on a stock bottom end I recomend ported LT1's or LT4's. The 76cc will kill the compression ratio and since the runners are larger that's a bad combo for throttle response.
If you mill the head, you need to mill the bottom of the intake to match the runners, if you angle mill the head then you need to mill the edge of the intake to match it.
Bret
West South Central Moderator / Special Guest
Joined: Dec 1998
Posts: 1,650
From: Coppell, TX USA
I think he is trying to lower the compression for a blower or something?
if not.. obviously you will want to mill the chambers down to 52-56 depending on other variables. just tell AFR you want 56cc chambers, and they will mill them the correct amount, and drill the accessory holes properly.
if not.. obviously you will want to mill the chambers down to 52-56 depending on other variables. just tell AFR you want 56cc chambers, and they will mill them the correct amount, and drill the accessory holes properly.
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Joined: Feb 2002
Posts: 13
From: Ancaster, Ontario, Canada
Thanks for the reply. I am presently running stage 2 LT1 heads but would like to increase my performance by upgrading to the AFR. Would the 190 AFR give improvements over my existing heads which flow 270 intake and 180 exhaust at 550. Car runs 12:0 @113 with A4 with heads and cam. Does anyone have some comparison dyno or et numbers of stage 2 vs AFR as the AFR literature really doesn't show much improvement on flow numbers over what I have.
On the topic of supercharging I have stayed away from this due to stock bottom end but would the 76cc AFR 210 decrease the compression enough to safely boost 8-12# of Procharger without worry of destroying the shortblock or are you still better off with low compression forged pistons.
On the topic of supercharging I have stayed away from this due to stock bottom end but would the 76cc AFR 210 decrease the compression enough to safely boost 8-12# of Procharger without worry of destroying the shortblock or are you still better off with low compression forged pistons.
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Joined: Oct 2002
Posts: 6,518
AFR heads are not going to be worth anything on a 270cfm LT1 head car. So don't even bother with them now, your not going to gain anything.
With a low compression you could run boost, but I would not recomend 8-12psi on a stock short block, you'll wear it out.
Bret
With a low compression you could run boost, but I would not recomend 8-12psi on a stock short block, you'll wear it out.
Bret
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