Quote:
Originally Posted by bigblockv6
Myself, I would not waste time and money on the 305, just go with a bigger V6. I pulled the 305 out of my 68 K2500 and replaced it with a 478M V6. Putting a 3.86 stroke in a 305 will require custom pistons, the longer stroke will make the pistons travel slightly above the bore, some say you can have the stock pistons machined down. You want a stroker V6 GMC made a 379 from 1973-74, basically a 351 with a 478 crankshaft. Same thing with the 432, a 401 with a 478 crankshaft.
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The 3.86 crankshaft has eight mounting bolts to the flywheel along with external balancing on the flywheel and front balancer, the 305 has six flywheel mounting bolts and is internally balanced. You would be putting way to much money into a 305 just to accomplish and extra 25-30 more cubic inches, just not worth it
