Head gaskets
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
Head gaskets I'm buying a complete gasket kit (GM), and want to know if I need the 6.0L or 5.7 for my setup. 347 with #317 6.0L heads. Why are the 6.0L head gaskets more expensive? Remember, this will be for a boosted motor, please let me know, I want to make a purchase tonight! Thanks!
Under a stock block you want to match your gaskets with your bore..so most of the time a gasket w/ 3.910" bore and about .050 thickness will do fine, you have the "6.0L" heads not a 6.0L bore correct? May go with a different thickness to adjust slight compression for FI applications...
You can use the stock 5.7 head gasket with the 6.0 head on a 5.7 short block. The thickness on eather gasket is .051 thick. One thing to think about depending on how much boost you plan to run, the 6.0 head gasket will help you drop some compression. It won't be much but any little bit helps! Another thing you might want to consider is a Cometic gasket. We can order them for you in a custom thickness to help bring down compression. Eather way let me know if I can help!!
Originally Posted by KJ@FriendlyChevy
You can use the stock 5.7 head gasket with the 6.0 head on a 5.7 short block. The thickness on eather gasket is .051 thick. One thing to think about depending on how much boost you plan to run, the 6.0 head gasket will help you drop some compression. It won't be much but any little bit helps! Another thing you might want to consider is a Cometic gasket. We can order them for you in a custom thickness to help bring down compression. Eather way let me know if I can help!!
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It is a must to have the gasket wider than the bore obviously and it must be wider than the combustion chamber otherwise it will hang in the chamber sides and cause detonation and burn. So whatever is wider, the chamber or the bore use that measurement and add at least .010 minumum to be safe on most gaskets. I believe the GM 6.0L's are 4.040" gasket bore.
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Verdad Gallardo Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
hehe, no DIRECT answer, I love this. =) I bought the 6.0L MLS gaskets vs the 5.7 "composite" they had advertised. That was their primary concern - the combustion chamber being wider than the gasket, but I have no idea. With the diamond pistons I have, the #317's, and the 6.0L gaskets, I should be around 8.7:1.
