I'm in the progress of replacing the head gaskets on my '66 high compression 330 engine. As far as I know everything is stock.
I ordered the Mr. Gasket Ultra seal head gaskets with a compressed thickness of 0,038i http://www.summitracing.com/parts/MRG-5788G
Now the question is if I should mill my heads to compensate for the thicker head gaskets? And if so how much?
As always any answers will be greatly appreciated!
Thanks

 

I'd just do a 'clean-up cut' on the heads, unless you've got better than 93 octane fuel available.
Sure, you're reducing some compression, but modern fuel is junk, compared to what that motor was designed to live on.
If you're bringing the car back with you, all the better!

 

Okay thanks Rickman!
I can choose between 95 octane fuel and 98 octane fuel but it's the ROZ not the MOZ...
But will I feel any power difference because of the reduced compression?

 

98 RON is roughly equal to our 93. I'd just do a clean up cut as discussed.

 

I doubt you'll feel a difference - if you've loud mufflers, it might be a decible quieter.
I once took .010 off a pair of 283 fuelly heads with 12 1/2 pistons - MUCH LOUDER!

 

A whole decibel?! I doubt that I feel a difference, too, as I've only driven the car for about 10 minutes so far
I'll let them do the clean-up cut then! Many thanks for your advice, Rickman and Mark!

 

I forgot to ask if I have to change anything on my valvetrain due to the thicker head gaskets??
Thanks

 

If it was me I would cut .020 off. Just to compensate for the thicker gasket.
But that is me.

Gene