Thinner head Gaskets
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Thinner head Gaskets Anyone know who makes a .042" or .043" compressed head gasket for a 99 LS1? I'm putting a set of milled AFR's on soon. I have a set of .052" compressed stock gaskets for installation. What I would like to do is put together the h/c package assembled and check my p/v clearance and if adequate install a .042" or .043", and if not stay with the .052" gaskets. Right now I have the heads milled .010" and with the .052" gasket I should be close to a 63cc combustion chamber vol. I'm using a 224/228 .581/.588 112+2 or +4 cam (I'll check for best fit then set the advance). I'd like to get the tightest quench but unfortunately can't keep the car where the lift is for more than a few days so I don't have time to assemble, check, remove, disassemble, re-mill, and reassemble. I also have the Isky piston notchers but I really, really don't want to go there unless I absolutely have to (inadequate p/v with .052" gaskets).
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Originally Posted by PREDATOR-Z
Cometics .043 + .030 (62cc) = ~11:1 CR as per Tony Mamo (AFR)
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From: BFE
You are correct!! I goofed 
This is part of the PM he sent me:
So felpro would be good.
This is part of the PM he sent me:
I would do it differently with an .040 gasket and a 62 cc chamber....provides the same CR and better (tighter) "quench", which is a good thing.
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Originally Posted by PREDATOR-Z
You are correct!! I goofed
This is part of the PM he sent me:
So felpro would be good.
This is part of the PM he sent me:
So felpro would be good.
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From: Washington Township, NJ
Originally Posted by PREDATOR-Z
On another thread, Tony mentionned having thin cometic gaskets in stock.
From the AFR site it mentions "Cometic AFR # 6846".
This might be the one.
Call Tony and find out.
From the AFR site it mentions "Cometic AFR # 6846".
This might be the one.
Call Tony and find out.
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From: BFE
Originally Posted by ArKay99
I'll check that out. I'll give AFR a call tomorrow.
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From: Washington Township, NJ
Originally Posted by PREDATOR-Z
BTW, I'm going with AFR's too. Could you post if that are the gaskets needed? It would be good info to have on the forum's data banks.
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Here is what I discussed with Tony@AFR. Optimum head mill is .024 for 62cc combustion chamber for 11:1 c/r using a .040 gasket. One thing to keep in mind is this is on the hairy edge for detonation. They are using a Cometic gasket that is a custom MLS with 3.910 bore and .040 compressed thickness. The cam that was used was a 224/228 .581/.588 @114. I didn't ask about the advance. With that mill and gasket thickness p/v was as close as could be reliable. I'm using a 112lsa+2 and will try a +4 install but I may be close due the tighter ICL of the 112@+4. So I'm leaving the .010 mill and checking p/v and if I have the room I'll mill them the extra .014. If not I should only leave ~5hp on the table. I'll be running 64.34cc combustion chambers and quench should still be good with that gasket.
quench is .033
Originally Posted by John B
This is pushing it a bit much. Any decent racer's shortblock assembly handbook will typically spec out a minimum 0.035" - 0.045" for use with good aftermarket connecting rods because your stockers will stretch too much at high RPM! Might want to think twice about this one
its on a forged 347 w/ arp bolts and studs through out.
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From: Washington Township, NJ
Originally Posted by jrp
im running a cometic .043 gasket 3.905 bore, 5.7 heads milled .020, and pistons out the hole .010; quench is .033. my SCR is a little higher then 11.1 though 
DCR much different than SCR
Originally Posted by ArKay99
pistons out the hole... That's my unknown until I get the heads off and mic them. That is definitely going to be a factor with stock decks. Are yours .010 out due to cleanup/squareing? BTW, I heard that cam you are running. Lot's of overlap there...
stock treated crank
eagle 6.125 rods
custom diamond pistons; 3.905 bore 1.309 CH w/ .927 pin
stock deck (9.240)
ect.
Last edited by jrp; Sep 7, 2004 at 11:23 PM.
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From: Washington Township, NJ
Originally Posted by jrp
im running custom diamond pistions with a CH of 1.309. and are you talking about my old tr230? my custom cam for the new setup aint ground yet
Originally Posted by ArKay99
There was a sound byte about 2 weeks ago that you posted of a scarey sounding cam. I thought that is what you are running.
my DCR should come out to ~9.1
Just wanted to let everyone know that we are a stocking dealer for Cometic! I have 0.030" & 0.040" (3.910 bore) in stock ready to ship. $63.75 per side is what they go for. Let me know if I can help!!
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Originally Posted by z-ya
felpro 9284pt for stock bore.
Where would I get it????
***EDIT***
I found Felpro's tech line number... it is .054 compressed, .060 uncompressed....
Last edited by SideStep; Oct 25, 2004 at 03:39 PM.