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flatford39 · 02-02-2016, 09:59 PM

Rebuilding a Mercury 8BA motor. 1953 I think. It's time to buy the pistons and it's not as easy as doing a SBC. This is a stock bore that has been bored out .030. It also has a 4" crank.

So I am looking for 3.2175 pisons that are compatible with the 4" crank.Has anyone used to .030 over Sealed Power pistons that Summit Racing is selling. They are four groove but they don't differentiate between a 4" crank and the ford 3.75 crank.

Should I be concerned??? Are there camshaft clearances with the longer stroke???

Internals on this engine will be pretty much stock.

Thanks for any help.

02-02-2016, 09:59 PM	#1
flatford39 Senior Member Join Date: May 2010 Location: NE Illinois Posts: 499	Some advice on 8BA pistons Rebuilding a Mercury 8BA motor. 1953 I think. It's time to buy the pistons and it's not as easy as doing a SBC. This is a stock bore that has been bored out .030. It also has a 4" crank. So I am looking for 3.2175 pisons that are compatible with the 4" crank.Has anyone used to .030 over Sealed Power pistons that Summit Racing is selling. They are four groove but they don't differentiate between a 4" crank and the ford 3.75 crank. Should I be concerned??? Are there camshaft clearances with the longer stroke??? Internals on this engine will be pretty much stock. Thanks for any help.