Michael Davis

Okay, Ed and Vader... flame away.

"A friend" put forth an idea of building a 327 ci motor from a block that was 1 pc rear main seal and roller cam.

I can't remember my history sometimes but IIRC


283 is a 283 crank in a 283 block
307 is a 350 crank in a 283 block
327 is a 283 crank in a 350 block
350 is a 350 crank in a 350 block

So if IIRC ... then the real question is can a 283 crank which was made in the days of a 2 piece rr main seal block be "up-fitted" into a 1pc rr main seal block

stevedave454

well basically what is comes down to is there are a few diff cranks..

3.00" 283/302
3.25" 307/327
3.48" 305/350
3.75" 400

now if you wanna make a 327 with a newer block then get a 350 (4" bore) block and use a 327 (3.25" stroke) crank...now of course they didn't make a 1 piece rear main 327 crank, but i there are adapters.... either they make adapters to put a 2 piece crank in a 1 piece block (this is what you want) or vice versa, but im pretty sure they make the ones you need (around $150-200)
and for the record depending on what your doing with this i think a 350 might make more power cheaper... it'll at least make the same power... but i am one of those that believes cubic inches are not the only way to build power, and i also love short stroke motors (preferably with a large bore) that rev very high, so i say go for it you might end up having 10-15 RWHP less than a similarly built 350, but atleast you have a somewhat unique motor, and i think thats cool

ChevyGuy87

i don't know if theres a crank out there that fits your criteria, but there's a small problem with your thinking. a 350 is a 4 inch bore, 3.48 inch stroke. 327 is 4 inch bore, 3.25 inch stroke. a 283 is 3.875 inch bore, 3 inch stroke. if you take a 283 crank and put it in a 350 block, you'll have a 302. however, if you take a 327 crank and put it in a 350 block, you'll have a 327. if you jump in the wayback machine, you'll see that the 302, 327, and 350 all shared the same block, just different crank and pistons.

look around at crank manufacturers, there is probably a one piece seal 3.25 stroke crank out there. but you will still wont make as much power as a 350, with all else being the same. the longer stroke helps. why else would people stroke a 350 to 383?

Streetiron85

I actually bought an adapter to fit a LJ 2pc seal crank into a 1pc seal block for less than $20. It's made by CAT, Dyno-Flo sells them.
I haven't tried it, but at the price it seemed like a good thing to have around, just in case I wanted to do what you're asking about.
I have an extra 3.25" stroke crank, and the concept of a roller cammed 327 seems interesting.

SOLID LIFTER

GM also sells an adapter kit for useing a 2 piece seal crank in a 1 piece block.

ede

biggest problem using gm parts is all 327 cranks except the last year the made them are small journal aqnd one pice gm blocks are large journal. it'd be as simple as giving your credit card info to any of, or some of, the aftermarket crank makers to get a one piece crank with a 3.25 stroke. call some of them and see what's out there to be had. unless you're restricted by class rules is's sort of foolish to limit yourself on cubic inches.

Streetiron85

I agree with this. In fact, it's darn near SENSELESS to go shopping for new hi po parts for a street 327, when parts for a longer stroke motor will cost you less. Especially when you consider that there are many many 3.25 cranks out there that nobody seems to want, gathering dust. Of course there's the journal dia issue too.
BUT... If you're one of the guys that has a LJ 3.25 crank sitting around gathering dust, or you can get one for free, IMO it doesn't make sense NOT to build it. There are some great heads that will fit onto a 327, all the other stuff too.
If it isn't fast enough, build a stroker, and your 327 can be a spare.
If there are 305s running in the 13s...