Donny vestal Posted October 22, 2014 Share Posted October 22, 2014 what do i have to do to take my 402 ci to a 427 ci. Quote Link to comment Share on other sites More sharing options...
overdrive Posted October 22, 2014 Share Posted October 22, 2014 Check http://www.hotrodders.com/forum/402-into-427-a-140795.html and http://www.chevelles.com/forums/showthread.php?t=234709 Dan Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted October 22, 2014 Share Posted October 22, 2014 427s have a 4.25 inch bore, 402s are 4.125. Boring a 402 .125 would make some thin cylinder walls. You could get a 454 block and put your crank in it with new pistons, but at that point why not go 454? The extra .250 inch stroke would help torque. There are some stroker pistons out there, a 454 crank in your 402 would get you 433 with a .030 over bore. Seems like lots of cost when there are still 454s to be found. Quote Link to comment Share on other sites More sharing options...
Donny vestal Posted October 23, 2014 Author Share Posted October 23, 2014 that answers my question dave thanks. Quote Link to comment Share on other sites More sharing options...
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