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Author Topic:   engine I.D. question?
thumpin cat

Posts: 129
Registered: Mar 2002

posted 02-28-2003 11:35 PM     Click Here to See the Profile for thumpin cat     Edit/Delete Message   Reply w/Quote
how can i tell the bore of my 351w by just taking the head off? if their any I.D. numbers on the piston?

please let me know thanks a lot.

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Ryan Wilke

Posts: 1115
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 03-01-2003 01:06 PM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
Sure -- MOST (but not all) of the time, IF it's an oversize piston - the amount of overbore size will be stamped on the piston top: 010, 020, 030, etc. Trouble is, if the engine has been run a while, the stamping may be filled in with carbon deposits...... so you may need to CAREFULLY scrape the piston top. It would be best to turn the engine over by hand to bring the piston up to the top of the clyinder (Top Dead Center, TDC) so you prevent any slip and gouge of the cylinder wall.... also don't dig into the metal of the piston head....that won't help any.

The only 100% true way would be to borrow somebody's mic or snap gage and hand turn the engine so the piston is 1/2 way down the cylinder then physically measure the diameter of the cylinder.

Good Luck!

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