Dear Oldsmobile,

[olds307 and 403]

The 403 and 307 use the same crank?????

Yes, direct bolt in, just the balance issue.

 

[TURNA]

Well then i'll just find a good 307 crank

Does it matter what years? roller/non roller use the same crank?

 

[olds307 and 403]

No all the 307 cranks should be the same. A 350 N crank is a good option if you want stronger but only marginally heavier. Also the 74 to 80 350 crank is the same and would require less weight to balance.

 

[pontiacgp]

what we need here is lots of popcorn....

 

[pagrunt]

what we need here is lots of popcorn....

First order, some might be left overs from Iowa buts still good. 😉

 

[JAMCAR223]

20 on the crank 20 on the rods
40 on the pistons

this thing was beat to poop

Oh My... I wouldn't use the block or the crank. Curious to see how this pans out.

 

[olds307 and 403]

Honestly I would run both, quit being babies. I have .039" overbore stroker pistons for my 403. There are .040" bearings for Olds cranks. Big babies😫

 

[MrSony]

i have an olds 350 n crank. but it's mine soooooooo~
sucks about the crank. makes me worried for my old 350's crank. them gouges are deep.

 

[TURNA]

No all the 307 cranks should be the same. A 350 N crank is a good option if you want stronger but only marginally heavier. Also the 74 to 80 350 crank is the same and would require less weight to balance.

So what years on the 307 cranks??

 

[fleming442]

Any of them. Send it.