AFR 225 large bore on a small bore block with boost?
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From: Tinker till it blows, then back it off a notch, maybe!!
AFR 225 large bore on a small bore block with boost? I am currently buidling a 383 ls engine.
4" stroke and 3.905" bore with cr just under 9 to 1
I have AFR 225's, but they are for a large bore engine. AFR recommends using a 4.135 to 4.165" bore gaske, but I am concerned about sealing, in that I may need to turn the boost up to 15 or 20 psi.
Looking for 800rwhp/800rwt with my 3.3 liter whipple.
Anyone used these heads on a small bore engine with lots of boost?
thanks
4" stroke and 3.905" bore with cr just under 9 to 1
I have AFR 225's, but they are for a large bore engine. AFR recommends using a 4.135 to 4.165" bore gaske, but I am concerned about sealing, in that I may need to turn the boost up to 15 or 20 psi.
Looking for 800rwhp/800rwt with my 3.3 liter whipple.
Anyone used these heads on a small bore engine with lots of boost?
thanks
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From: Tinker till it blows, then back it off a notch, maybe!!
My current setup is close to that being a stock cube motor with the large bore AFR 225s on it. I run the AFR recommended cometic gasket and it works fine so far at 15 psi. I am going to run about 18-20 now that my fuel system is all done but just haven't had a chance to turn it up yet.
8 sec potential, 12 sec slip
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I had that same question. Well, close... Check out Tony Mamo's responses (and others) here:
https://ls1tech.com/forums/generation-iii-internal-engine/813229-afr-225-big-bore-72cc-heads-346-a.html
https://ls1tech.com/forums/generation-iii-internal-engine/813229-afr-225-big-bore-72cc-heads-346-a.html
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From: Tinker till it blows, then back it off a notch, maybe!!
So what's the verdict on gaskets??
4.1 bore or min 4.125 as recommended by Tony?
MLS = OK....did you guys spray the gaskets with copper or install dry?
Also what do you think max boost can be....can I go to 18 -20 psi safely, if detonation is held in check?
Also, how thich are the 5 layer gm gaskets? I am looking for .041" or thereabouts. Part number?
thx
4.1 bore or min 4.125 as recommended by Tony?
MLS = OK....did you guys spray the gaskets with copper or install dry?
Also what do you think max boost can be....can I go to 18 -20 psi safely, if detonation is held in check?
Also, how thich are the 5 layer gm gaskets? I am looking for .041" or thereabouts. Part number?
thx
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From: Tinker till it blows, then back it off a notch, maybe!!
Just checking to find out if anyone has had problems with boost levels near 20 psi.
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From: Tinker till it blows, then back it off a notch, maybe!!
I got a sweet deal on a 383 rotating assembly, so I took it.
With the power level that i am looking for, I will hopefully get there without having to up the boost too much, and am using a cam that should bleed off a bunch down low....
Looking for around 600 rwt at 2k and 800 rwhp at 7k, without having to go to 20 psi.
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I have a balanced rotating assembly (346) that I decided to keep together....higher cr, etc. May use it in another car or off it.
I got a sweet deal on a 383 rotating assembly, so I took it.
With the power level that i am looking for, I will hopefully get there without having to up the boost too much, and am using a cam that should bleed off a bunch down low....
Looking for around 600 rwt at 2k and 800 rwhp at 7k, without having to go to 20 psi.
I got a sweet deal on a 383 rotating assembly, so I took it.
With the power level that i am looking for, I will hopefully get there without having to up the boost too much, and am using a cam that should bleed off a bunch down low....
Looking for around 600 rwt at 2k and 800 rwhp at 7k, without having to go to 20 psi.
still very nice work. cant wait to see final numbers.
Chris.
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From: Tinker till it blows, then back it off a notch, maybe!!
so , the cat is out of the bag....I have been running twin ic's layed down.
I guess that if GM or whoever thought it to be a decent idea, then my setup isn't too bad.
Not too many options when trying to fit it ll under ANY hood...only so many ways to configure it.
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Actually and surprising to me, my ic setup is almost identical to the ls9 pics floating around. Differences are copper vs alu and actual depth of ic's.
so , the cat is out of the bag....I have been running twin ic's layed down.
I guess that if GM or whoever thought it to be a decent idea, then my setup isn't too bad.
Not too many options when trying to fit it ll under ANY hood...only so many ways to configure it.
so , the cat is out of the bag....I have been running twin ic's layed down.
I guess that if GM or whoever thought it to be a decent idea, then my setup isn't too bad.
Not too many options when trying to fit it ll under ANY hood...only so many ways to configure it.
are you still planning on selling kit once you have finished?? how about an 'performance' lower manifold (with your twin intercoolers) for the Magy guys?
thanks Chirs.
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From: Tinker till it blows, then back it off a notch, maybe!!
My manny is obsolete
So....when the smoke clears, I'll have to see
