Afr ??
Afr ?? I just bought a set of AFR 205 off a sponsor. I ask for them to be milled down so i could have a 10.75 to 1 cr. I received them yesterday and they say they've be cut .030 on the box. That seems like alot to me. So what i need to know is what head gaskets to use to give me a pump gas friendly c/r.Or if they heads are milled too much for that and have to be returned.It is on a stock LS1 block with a TR 224/112.Also will the stock 7.4 pushrod be ok or will i need 7.35s.
Thanks,
Anthony
Thanks,
Anthony
Last edited by 01SOMWS6; Aug 13, 2005 at 07:37 PM.
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From: Don't Blink or you might miss me :P
the OEM LS1 head gasket would enough but if you wanted a thicker one, go with the LS6 head gasket, it would be more than enough
the OEM LS1 head gasket will give you exactly 10.75:1
the OEM LS6 head gasket will be around 10.6:1
the OEM LS1 head gasket will give you exactly 10.75:1
the OEM LS6 head gasket will be around 10.6:1
Actually, you're in luck. The AFR 205s are not as octane sensitive as stock heads of the same compression because of their superior combustion chamber design with the double quench pads. You can make lots of pump-gas-friendly hp with 11-1 compression. That's what I'm running!
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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From: Working in the shop 24/7
Originally Posted by Patrick G
Actually, you're in luck. The AFR 205s are not as octane sensitive as stock heads of the same compression because of their superior combustion chamber design with the double quench pads. You can make lots of pump-gas-friendly hp with 11-1 compression. That's what I'm running!
Thanks for the replies!
Using that compression ratio chart i came up with 11.11 to 1 with a stock .054 gasket.And 11.38 to 1 on a .045. Is that correct?
And is 11.38 to 1 ok on pump? I can get 93 octane or if need be sunoco 94.
Thanks,
Anthony
Using that compression ratio chart i came up with 11.11 to 1 with a stock .054 gasket.And 11.38 to 1 on a .045. Is that correct?
And is 11.38 to 1 ok on pump? I can get 93 octane or if need be sunoco 94.
Thanks,
Anthony
Last edited by 01SOMWS6; Aug 13, 2005 at 09:46 PM.
Installed my AFR 205's milled .024 to 62cc with .040 cometics on vette, used 7.325 pushrods with crane 1.8 rockers, very quiet now. If you can find 93 octane you should be fine
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Originally Posted by 01SOMWS6
Thanks for the replies!
Using that compression ratio chart i came up with 11.11 to 1 with a stock .054 gasket.And 11.38 to 1 on a .045. Is that correct?
And is 11.38 to 1 ok on pump? I can get 93 octane or if need be sunoco 94.
Thanks,
Anthony
Using that compression ratio chart i came up with 11.11 to 1 with a stock .054 gasket.And 11.38 to 1 on a .045. Is that correct?
And is 11.38 to 1 ok on pump? I can get 93 octane or if need be sunoco 94.
Thanks,
Anthony
Almost exactly what I got as well.
You will be fine with a good 93 octane and a good tune.
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With a 61cc head, 3.960 .053 gasket I get 10.88-1, 3.960 .043 I get 11.17-1. I run 11.1-1 on 91 octane with 28 degrees timing and 0 knock. I would run the .043 gasket if it was me.
Originally Posted by strokedls1
With a 61cc head, 3.960 .053 gasket I get 10.88-1, 3.960 .043 I get 11.17-1. I run 11.1-1 on 91 octane with 28 degrees timing and 0 knock. I would run the .043 gasket if it was me.
where do you get the 3.960?
Is that the bore size your using?
If so Why?
I am just using a 3.960 as the head gasket bore. It could be smaller, but it would not have a big change in static compression if you went down to say 3.930 with a .043 gasket it only goes to 11.18.
11.3 can be easily daily driven in any state that has 93 octane.
It is all in the tune.
I haven't even done a heads and cam package on a daily driver with less then 11.3 CR in the last year. There is just to much power, and gas milage in the added compression and we all run 93 octane anyways so might as well get the most out of our expensive *** gas.
It is all in the tune.
I haven't even done a heads and cam package on a daily driver with less then 11.3 CR in the last year. There is just to much power, and gas milage in the added compression and we all run 93 octane anyways so might as well get the most out of our expensive *** gas.
If you are wanting a little bigger gasket you can get the standard replacement FelPro #9284 PT, these are what I use to deshroud the chambers on heads when I did them. The bore on them are 3.985 I think.
