Chrysler LA / NASCAR 355 cu. in. crank shaft

Rat Bastid said

I believe the 18 degree stuff is on the bore center. You just can’t get valves that big in the bore if they don’t open on the bore center.

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do people angle mill sbm heads like every body dose sbc heads? i know in dirt track the fords are 9 degree head,...ive seen chevy 23 on down to 13 but 13 degrees didnt work good on them bow ties