Head Gasket Question - Team Camaro Tech
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post #1 of 6 (permalink) Old Jun 3rd, 14, 06:24 PM Thread Starter
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Al
 
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Head Gasket Question

I'm in the midst of a cyl head swap (383) -

When my engine was built the final cylinder hone was done with a torque plate and a Fel Pro 1043 .039 head gasket. The block got a clean-up cut only on the decks, pistons are .026 in the hole, measured with a dial indicator. I ignored his advice at the time and used a Victor 5746 @ .026 for about 10 years, to get a CR of 9.45:1

My old heads were listed @ 62 cc although I didn't cc them. The new heads are 64 cc. - not gonna cc them either.

With the same Victor gasket I'd go to 9.25:1 , and with the .039 Fel-Pro I'd go to just a hair over 9:1. With a Fel-Pro 1094 (coated shim) I'd get right back to 9.45:1. The 1094 would give the most ideal quench @ .041, although I'm not sure how important quench is on a motor of 9 -9.5:1 CR.

I'm probably obsessing over a half point of compression. My question has more to do with distorting the bore by using a different head gasket than the one the final torque plate honing was done with.

What do you guys recommend? Thoughts on bore distortion? All thoughts much appreciated.


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post #2 of 6 (permalink) Old Jun 3rd, 14, 06:41 PM
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Re: Head Gasket Question

The distortion comes from the bolt torque and the sequence it was done in. I think you'll be fine with any gasket you choose.
IF you go with a MLS gasket, I would double coat each side with copper spray (helps seal).
Half a point in compression loss....guessing 20-30hp loss ?

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #3 of 6 (permalink) Old Jun 4th, 14, 07:19 AM
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Michael
 
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Re: Head Gasket Question

Aluminum or iron heads?
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post #4 of 6 (permalink) Old Jun 4th, 14, 07:23 AM Thread Starter
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Al
 
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Re: Head Gasket Question

Aluminum


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post #5 of 6 (permalink) Old Jun 4th, 14, 04:40 PM
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Sean
 
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Re: Head Gasket Question

Actually gasket type does matter, I would try to use what they used with the torque plates. The fiber type gaskets allow more distortion than an MLS and probably the shim type. It would be worse going MLS to fiber type probably, but I would try to keep it the same.

As for compression change, I hear you I obsess overy stuff like that too, but from 9.5 to 9.0 I would be surprised to see much loss at all, and you will never feel it in the SOTP dyno.

Glad to see your not going to the "dark side" like Ron did....

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

Franklin D. Roosevelt
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post #6 of 6 (permalink) Old Jun 5th, 14, 07:05 AM Thread Starter
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Al
 
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Re: Head Gasket Question

Thanks Sean. No - not the dark side, but I was jealous of your SB 2.2 heads, so I got a pair of 3.3s. Looking to make about a million horsepower.

I like the Marshawn Lynch quote. Not quite as deep as fellow Golden Bear Jason Kidd when he said they were going turn the Mavericks around 360 degrees.


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