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Message: [QUOTE="Hotrodtractor, post: 373786, member: 25"] Good question without an easy answer. You want the piston to head clearance to basically be minimized right down to the point so when the engine is running that the piston just BARELY doesn't hit the head. This number is a stack up of MANY variables - if you say increase the rod bearing clearances - you now need to increase the piston to head clearance, you install a heavier rod - again increase in clearance, you want to rap it out at a higher RPM - that causes more rod stretch so you need more clearance, etc...... So in the end its a combination that whoever is building your engine needs to come up with so they can take into account the clearances and tolerances that they are building your engine to as well as the components of your specific build. When in doubt - err on the large side of the most clearance possible. Factory spec is 0.010-0.031" piston protrusion - minimize the protrusion to get the most clearance possible. I feel that 0.050" piston to head clearance is "safe" for most people to build to. I go a little tighter than that on the combo of parts that I know and feel safe with - but the next motor I plan on opening it up a little more BECAUSE of another tolerance change in a different component that I am also opening up for a different reason. Its a vicious cycle. LOL [/QUOTE]

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