Thread: piston deck height

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As Jerry suggested, swap 1,5 and 2,8 and see what you get. And like Denny said, place the dial indicators at 3 O'Clock and 9 O'Clock as you stand at the side of the motor. A difference between the 3 and 9 positions could indicate a bent rod or one that was not machined correctly. The pistons are usually pretty square.

When all is said and done, choose a gasket thickness that when added to the pop-up of the tallest stack, will give you a squish of 0.045" to 0.050". I use 0.035" to 0.040" for a tight fitting cast or hypereutectic, but forged pistons use a little looser fit and have more room to swivel on the pin, so a little more clearance on the squish is called for. At least that's the way I do it. There are others on this board who have a lot more engine building experience than I do and may suggest something different to you.

If you want to know the length difference between all the piston/rod assemblies, just mount each of them in the same hole and dial indicate them.