Head Gasket Choices?

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Apr 22, 2010 | 02:25 PM

slow ride 02

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Head Gasket Choices?

I am doing a head and cam swap, and would like to know what you guys have found out about different head gaskets. To start, we are working with a stock bore and stroke 346 (LS1) with AFR 205's milled to 62 cc's. First up we have stock MLS .051 GV ?. Next is Fel-Pro 1041 .041 x 4.135 9.cc G.V. (Built in pre flattend SS o-ring), Next we have Cometic C5475-040 .040 x 3.910 7.87 cc G.V. I will be using 91 octane pump gas, clearly I would like my cake and eat it to...lol what is the max C.R. I can use with a tight quench and 91 octane?

Apr 23, 2010 | 11:17 AM

slow ride 02

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Did I post this in the wrong section? Two days 56 views and 0 replys?

Apr 23, 2010 | 05:22 PM

SlickVert

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Quote:

Originally Posted by slow ride 02

I would go with the Cometic .040 gasket as long as you don't have piston to valve issues.
The tighter quench will help reduce the on set of detonation and make more TQ.
Bob

Apr 23, 2010 | 07:57 PM

Squirts11

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Quote:

Originally Posted by slow ride 02

I am doing a head and cam swap, and would like to know what you guys have found out about different head gaskets. To start, we are working with a stock bore and stroke 346 (LS1) with AFR 205's milled to 62 cc's. First up we have stock MLS .051 GV ?. Next is Fel-Pro 1041 .041 x 4.135 9.cc G.V. (Built in pre flattend SS o-ring), Next we have Cometic C5475-040 .040 x 3.910 7.87 cc G.V. I will be using 91 octane pump gas, clearly I would like my cake and eat it to...lol what is the max C.R. I can use with a tight quench and 91 octane?

I like the route you're taking, a bump in compression by milling and improving quench to run more timing, but I'm not positive the Fel-Pro 1041 is ideal for the 346, as the gasket indicates it's for a 4.135 bore (LS1 is a 3.91).

Am I incorrect? Can this be run on the stock LS1 bore?

Apr 23, 2010 | 11:01 PM

Duffster

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From: South of West Point Iowa

engine internal section might be more appropriate.

Apr 24, 2010 | 04:52 PM

slow ride 02

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Quote:

Originally Posted by Duffster

engine internal section might be more appropriate.

How do I move it? Or do I need to start a new thread?

Apr 24, 2010 | 05:02 PM

slow ride 02

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Quote:

Originally Posted by squirts11

That is a good question. Fel-Pro 1041 is the correct part number for the 346, I need to check with Cometic to see what the I.D. of there gasket is. I am told that the stock MLS is 3.940 x .051. I dont think the Cometic is the same size as the bore, if is was the ID of the gasket would be .225 larger than the bore leaving .1125 on each side of the bore.

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