1946 59a Mercury standard bore 3 3/16 pistons

[Phil Gillespie]

Originally Posted by Ronnie

Take that same ring and measure end gap at the bottom cylinder where the rings don't run.


R

That is where i did measure the end gap at this exact location.
Phil NZ

[Phil Gillespie]

[QUOTE=flatjack9;1859502]

Originally Posted by Phil Gillespie

Still awaiting some telescopic bore gauges to arrive to measure accurately.
My vernier at top of bore nil ridge apparent is 3.1878 approx.
Phil NZ[3.1875 would be .060 over. For every .001 increase in diameter, the end gap will increase a little over .003.

Must have misread this reading as its certainly not 60 thou over. oops.
Phil NZ

[cadillac512]

No,your measuring is correct...3 3/16" is 3.1875". That's the standard sized bore for your Merc. .060" over would be 3.2475"


Terry

[flatjack9]

Yup, my mistake. Forgot it was a 59AB engine.

[Phil Gillespie]

Originally Posted by Ol' Ron

If this was my engine, I'd bore it to 3 5/16, use Egge 3 ring pistons. Angle mill the heads .060: Use a Dremel to make piston to head clearance, same with valves. End result would be : increase of torque in the low and mid range , and better economy. Especially with a SBC distributor. Just use the stock cam and valve assys.

Ron would you please expand on the angle mill the heads .060,
Thanks,
Phil NZ