A typical align-bore starts with milling about .005" off the main caps' surfaces, so the new bore is centered slightly higher in the block. Timing chains are available in slight under-lengths if the crank center is moved up significantly. As Tom said, the machinist tries to do most of the cut from the caps.
Bill- it sounds like your friend is the guy who PM'd me for that 288 info. He didn't acknowledge receiving my reply (?). As I said to him, I'm guessing that bearing inserts are the same thickness among 288, 316, 347, 370, and 389 engines. If that's true, the numbers I gave him for his 288 main bores is correct (I need to look back at the PM for them).
edit: 2.4380"-2.4390"
Is his sceen name mjvaughans?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
Last edited by Jack Gifford; 01-03-2019 at 03:37 AM.
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