Not Ranked
I'd do the sonic check first.....I've done 4.275" bores without sleeves....but I would rather put 8 in and make it 4.250 as suggested above....and do it with a thin wall sleeve.
George
my 427 has 8 sleeves since 1994....and I still Red Light...just ask Rick Lake...the sleeves didn't help me race better...but the motor runs fine...have a good shop install and use liquid nitrogen.
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