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I have a later build Eddie 440 Sixpack manifold, and the machining and core shift is gruesome. Wouldn't surprise me a bit if it needs some correction.
The trouble is finding a machinist that can do it, and KNOWS what he's doing.
What also confused me is when I used a simple compression ratio calculator plugging in the values of existing setup it really shouldn’t have had a pinging problem.
Yeah, I'd like to have the gasket diameter closer to the bore size, but I'd look first for the thickness I want.
Time to do some calculations to find how much available gaskets affect the comp ratio.
I've always used the Wallace calculators, and without actual measurements of the heads, I use...
Keep in mind that air/fuel falls off a step a whole lot better than having to go over a step....best not to have any steps especially when the step is up.
It had fel pro permatex torque blue head gaskets and I measured their compressed thickness at ,050. If I use cometic I can easily get a fatter head gasket. Bore measured .030 over but the fel pro gaskets measured 4.5 bore. Shouldn’t I use a smaller diameter gasket?
If I were you....
I'd use the fattest head gasket (within reason) I could find (no quench to lose with a 906 head), a new bathtub, and use both gaskets that come with it.
The fat head gasket will take the place of the material removed, and lower the compression ratio a bit, so you can maybe use...
Had a mess of E body parts years ago but sold it all...and probably have enough to put my 66 Belvedere back together and not have to buy much but that's not in the cards.
No, do not touch the manifold. If all you did was remove enough to clean up the block, it will be fine. It is best to take material off of the intake side of the heads. If you remove material off of the intake, it is married to that engine. I would do a mock-up to test fit the heads to and...