Gen 6 head gasket question - Team Camaro Tech
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post #1 of 3 (permalink) Old Jan 9th, 17, 06:53 AM Thread Starter
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Dave
 
Join Date: Jul 2005
Location: Virginia/Mass
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Gen 6 head gasket question

I was on the Offshore forum trying to find some info about my Gen 6 494ci motor. It seems a lot people don't actually know much about them even though they think they do... One of the guys told me that if you use Mk IV head gaskets on a Gen 6 block, they will leek up into the intake area badly and you'll have a few other problems. I got my heads back this weekend and I don't see it.
The reason I'm asking if I can use a Mk IV gasket on a Gen 6 motor is because there are a lot more options in the Mk IV head gaskets. The only difference between the two is a blocked off coolant hole at either end of the gasket. The Gen 6 block isn't cast with the extra coolant hole. If the gasket doesn't cover that spot, so what? Would it hurt anything? The gaskets I pulled of the motor were Mk IV, but that doesn't mean much considering who built the motor.
Here's a couple of pics of what I have:






'69 SS396 X66 L34 08D M21 BS
460ci Gen VI 9.75:1 AED 950 carb
241/249 @ .050" .625/.625 110 LSA

Semper Fi!

"The galleries are full of critics. They play no ball, they fight no fights. They make no mistakes because they attempt nothing."
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post #2 of 3 (permalink) Old Jan 12th, 17, 09:01 AM
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Re: Gen 6 head gasket question

Some Mk IV head gaskets will not have the coolant passage holes between the cylinders. With the lack of end-holes in the block, that will lead to overheating.

The Mk IV head gasket MUST be for parallel cooling, not series cooling, if you have any chance of success.

Beyond that, I can't really help. Never had a Gen 6 block to compare to. I did put Gen 6 heads on a Mk IV block, though. I used Mk IV gaskets. This was on a boat using a non-pressurized cooling system. Good thing, because when I took it apart, I found the gasket was barely sealing in a couple of places.
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post #3 of 3 (permalink) Old Jan 13th, 17, 11:10 AM Thread Starter
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Dave
 
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Re: Gen 6 head gasket question

Quote:
Originally Posted by Schurkey View Post
Some Mk IV head gaskets will not have the coolant passage holes between the cylinders. With the lack of end-holes in the block, that will lead to overheating.

The Mk IV head gasket MUST be for parallel cooling, not series cooling, if you have any chance of success.

Beyond that, I can't really help. Never had a Gen 6 block to compare to. I did put Gen 6 heads on a Mk IV block, though. I used Mk IV gaskets. This was on a boat using a non-pressurized cooling system. Good thing, because when I took it apart, I found the gasket was barely sealing in a couple of places.
Thanks a lot. I actually was able to get myself edjumacated on the subject. It turns out I was looking at the wrong coolant passage. At the end of the day, no matter what heads you're putting on a Gen 6 block, you need Gen 6 head gaskets.

The bottom pic is of a Gen 6 gasket. The top is Mk IV. The Gen 6 has the right and left side top passages blocked off.



'69 SS396 X66 L34 08D M21 BS
460ci Gen VI 9.75:1 AED 950 carb
241/249 @ .050" .625/.625 110 LSA

Semper Fi!

"The galleries are full of critics. They play no ball, they fight no fights. They make no mistakes because they attempt nothing."
HawkX66 is offline  
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