LA 318 advice

PRH said

Question for George Jets…….
Do you have a factory original piston from like a 69 318 that’s not in an engine you could measure the compression height on?
Or, know what that dimension is?

Often, the aftermarket “stock replacement” pistons have a different height than the originals.

Click to expand...

PRH

Here is a picture of a 1968 318 stock flat top piston with the valve reliefs, 9.2:1 cr.



See what you can make of this. Did this comparison 4 years ago, the '68 318 stock piston on the left and a '75 318 piston on the right.



As you can see the '68 piston on the left has the taller Compression Height.

Here are stock '69 pistons in a stock bore 318 block.



.040 ths down in the hole.


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