afr 205 76cc heads please!!!
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Joined: Jun 2004
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From: Kintnersville, PA
afr 205 76cc heads please!!! my project has changed, and the afr 225 72cc heads i have i really dont wanna use on my forged 347, for obvious reasons.. ( was gonna do an LS2)
now everyone is tellin me 4-6 weeks to get the 205 76cc heads i really want/need. anyone help me? thats kinda too long of a wait.
or what heads would you use in place of? really am trying to get the bigger chamber, for my desired comp ratio...engine will be blown, upwards of 15 lbs, of boost.
thanks if ya help!!!
now everyone is tellin me 4-6 weeks to get the 205 76cc heads i really want/need. anyone help me? thats kinda too long of a wait.
or what heads would you use in place of? really am trying to get the bigger chamber, for my desired comp ratio...engine will be blown, upwards of 15 lbs, of boost.
thanks if ya help!!!
Originally Posted by BoostedWS7
my project has changed, and the afr 225 72cc heads i have i really dont wanna use on my forged 347, for obvious reasons.. ( was gonna do an LS2)
now everyone is tellin me 4-6 weeks to get the 205 76cc heads i really want/need. anyone help me? thats kinda too long of a wait.
or what heads would you use in place of? really am trying to get the bigger chamber, for my desired comp ratio...engine will be blown, upwards of 15 lbs, of boost.
thanks if ya help!!!
now everyone is tellin me 4-6 weeks to get the 205 76cc heads i really want/need. anyone help me? thats kinda too long of a wait.
or what heads would you use in place of? really am trying to get the bigger chamber, for my desired comp ratio...engine will be blown, upwards of 15 lbs, of boost.
thanks if ya help!!!
AFR hasn't produced a 76 cc 205 and has admitted publically many times that we have no intentions of producing that head. Main reason being is that any application we could think of would be better suited in the larger 225 intake and exhaust runners (be it a big displacement build-up or a forced induction car such as yours).
Rick, the President of this company, has a bonestock GM short in his 2001 C5 and has put down 647 RWHP thru an A4 with only 9.5 lbs of boost. He did this using the exact heads you already have in your hand. Use the Felpro 1041 gasket or a Cometic with at least a 4.125 bore diameter and you will be fine. It doesn't matter that your stock bore is 3.900....the chamber being a little larger than the bore doesn't hurt a thing....in fact it improves low and midlift flow by making more room around the valve.
Bolt that baby together and get to the dyno....you wont be disappointed.
Thanks,
Tony
Last edited by Tony Mamo @ AFR; May 26, 2006 at 05:54 PM.
Thread Starter
Launching!
Joined: Jun 2004
Posts: 236
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From: Kintnersville, PA
thanks guys,
i am a lil nervous bout the bore bein smaller than the head chamber.... i would think the top of the cylinder sleeve would become a hot spot problem.
im really no engine building pro but, is this at all a possibility in running this setup? id really hate to mess things up.
ive talked to an engine builder about this, and he thought i should get the smaller heads,... but then again, this guy doesnt do much LS1 stuff.
thanks again guys, hook me up with more info and thought! i value all of your opinions.
i am a lil nervous bout the bore bein smaller than the head chamber.... i would think the top of the cylinder sleeve would become a hot spot problem.
im really no engine building pro but, is this at all a possibility in running this setup? id really hate to mess things up.
ive talked to an engine builder about this, and he thought i should get the smaller heads,... but then again, this guy doesnt do much LS1 stuff.
thanks again guys, hook me up with more info and thought! i value all of your opinions.
Tony Mamo knows AFR heads better than anyone, since he has been part of their development process for the LS1.
I'd give him a call if you still have any concerns...
With that said, the bore of the AFR 225s are 4.100" so even the LS2's bore would have been too small. You'll be fine, because the combustion hot-spot is not going to happen, since combustion happens in the middle or near the middle of the chamber... not along the edges (at least with a head that isn't half-assed designed that causes pre-ignition). The edges are very near to the piston anyway with very shallow clearances, and this is what is refered to as the "squish" or quench. This area causes the combusting gasses to travel rapidly towards the center of the chamber to increase turbulence (for good mixture and improved combustion rate).
I'd give him a call if you still have any concerns...
With that said, the bore of the AFR 225s are 4.100" so even the LS2's bore would have been too small. You'll be fine, because the combustion hot-spot is not going to happen, since combustion happens in the middle or near the middle of the chamber... not along the edges (at least with a head that isn't half-assed designed that causes pre-ignition). The edges are very near to the piston anyway with very shallow clearances, and this is what is refered to as the "squish" or quench. This area causes the combusting gasses to travel rapidly towards the center of the chamber to increase turbulence (for good mixture and improved combustion rate).
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Originally Posted by BoostedWS7
i would think the top of the cylinder sleeve would become a hot spot problem.
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On The Tree
Joined: Oct 2005
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From: PNW
Then get a set of LQ9 heads if you don't want to run the AFR 225's. They are basically a LS6 head with 72 cc chambers. If you like the small chambers of the AFR 205's, then get some dished pistons. I prefer custom dished to big chambers because they have a better squish. But the bigger chambers has less valve shrouding.
