Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Higher Compression????

How would one go about increasing their engines' compression ratio??? Thanks for any advice.

It would depend on if you're looking for the easy way or the hard way. The best (but most expensive) way is to change pistons. Not something for the faint of heart or wallet.

In the 'good old days' a reasonable increase in compression could also be had by exchanging the head gasket for a thinner version and/or machining (i.e., milling) a few thousandth of an inch (typically .015 to .030) from the cylinder head. In today's world with thin wall castings etc. I wouldn't venture a guess as to whether the "OLD SCHOOL" approach would be safe or effective. Perhaps someone with specific knowledge of the Ztech would care to jump in???

Well if ya got an SVT 2.5 and convert it to a 3.0 the you get 11:1 compression

Hmmm, yeah I doubt the different head gasket or milling would make much difference but who knows. So, what changes about the pistons to make the compression change? Would they be taller to actually increase the compression of the gasses? Or would the connecting rods be lengthened to increase the stroke?

look on ebay for svt pistons