Benjamin Franklin
Active Member
Can you put a poly crank in a 273? Im going to save a 273 empty block. Can I but any leftover 1965 318 poly parts in it?
Poly crankshaft in 273?
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Inertia
Well-Known Member
Benjamin Franklin
Active Member
Thank you everything i was remember/finding left out the 273. But this one doesnt say anything about the poly.
Babyblue66
Cool dude
Better plan on balancing it.
Yes, it's physically a bolt in deal.....as long as it's the "later" poly 318 and not the earlier ones.
perfacar
Well-Known Member
back in the day, mopar wanted you to install 318 poly crank in 273, as it was nitrated, i think the balance was very close as both used same rod. the piston/rod combo's were same weight. prob reblance though. this would be the 62 and later poly cranks.
Thanks for that. I couldn't remember the cutoff year from early to late.
According to Hot Rod Magazine's tech article on the new 273 back in 64, Chrysler gave the 273 an extra thick piston pin to make the 273's piston/pin the same weight as a 318 poly, thus they balance the same. Now I've never tried it myself, so can't personally vouch for that info.
Edit: and of course, aftermarket replacement 273 pistons may or may not have those extra heavy pins.
They also have those real heavy pins.
My +.030 Egge pistons and pins were 68 grams lighter than the stock standard slugs.
Torqueflite
Well-Known Member
There's a comprehensive parts interchange between the 1962 - 1966 A-block and LAs here: Poly Parts Interchangeable
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