Head gasket
 

Hello, needed for a friend.On a 4 cyl model A are there difference thickness head gasket to lower the compression after the head and block have been shaved.Who make them?

Re: Head gasket
 

How much was taken off the head and block. If they were just cleaned up I wouldn't think you need to worry about too much compression. A little more compression is a good thing. I use the Best Co. copper gasket.

Re: Head gasket
 

I like the [U]Best[U] copper too. Best gaskets are thinner than some, but that is a good thing. Best makes a composition gasket that is the same number, so request the copper as it is easier to remove when needed.

Re: Head gasket
 

I read the questions several times and still missed the "to lower" compression.

Re: Head gasket
 

On a stock model A engine , the pistons will protrude around 32 thousands or a small amount above deck height .

Re: Head gasket
 

Re: Head gasket
 

He has calculated the compression to be to high due to ping,other than retarding the timing,what do you recommended. On sbc we can order head gasket any size we need to adjust the comp if the block and the heads are shaved to much.

Re: Head gasket
 

Re: Head gasket
 

Hilarious! I forgot about that scene.

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Re: Head gasket
 

To prevent weeping, seal the gasket around the inner side of the water passages with silicone or some such thing.

Re: Head gasket
 

I have a Winfield head on my engine. The deck on the block had been shaved to clean it up. At TDC the pistons are almost .100" above the deck. After having the surface counter bored .062" for the pistons, I still get 165 psi compression. The pistons are .100" over.

Re: Head gasket
 

That was great, never saw that one before.......... Thanks for the laugh

Re: Head gasket
 

If you need more clearance, you can also use 2 head gaskets. I bought an engine at a swap meet, and when I cleaned it and took it apart I found someone had used 2 head gaskets for some reason, but it ran fine.

Re: Head gasket
 

Thanks for all that answered,any other suggestions to lower other than cut the pistons?

Re: Head gasket
 

I think it would be easier to flycut the recess above the pistons. Not much meat on the tops of the pistons to cut them shorter. Most people would be trying to increase compression and adjusting the spark rather then lowering it. Have you done compression check or clearance check with clay? Right now you are asking questions with too many unknowns? Like how much was taken off both? How thick the material is left on the head above the pistons? How far do the pistons pop up above the block? etc
I am thinking the 165 above is a typeo and might be 65LBS

Re: Head gasket
 

you think its pinging because of excessive compression on a stock head??? are you running it on kerosene? set your timing.

Re: Head gasket
 

The pinging could also be the pistons hitting the head.

Re: Head gasket
 

Decking or milling changes the cr very little. Check your timing. There is a timing strip available from the dealers that bolt to the front passenger motor mount bolt. Then you can actually use a timing light.

Re: Head gasket
 

Great video.

Re: Head gasket
 

I've used 2 gaskets with no problems, this on a Cyclone head. It resulted in 7.4:1 compression and cleared the pistons, which is why I did that.