If I’m not mistaken a 327 is a small journal and a 350 is a large journal. So I think no. But to 100%

 

Good point, but as I understand it, 327's come in both small and largen journal...

 

Only if it is a 69 327, since earlier 327's had smaller main bearings than a 350.

 

It’s very possible I’m not to familiar with 327’s

 

If That is the case You might have to change rods also ! You Would have to find out rod length difference if there is any !

 

Just wondering...I see a bunch of 327 blocks for sale cheap on craigslist from time to time...I have all the internals for a 350 already...was just windering if it could work.

 

Rod length is the same, 5.7 inches. Rod bearing journals for early 327 was (nominal) 2.00 inches, for 68 and 69 327 it was 2.100 inches.

 

1968 327 used large journals

 

My error, you are correct.

 

From the best of my knowledge: 1967 and earlier 327s have 2.30 inch mains. If someone makes a 3.48 inch crank with 2.30 mains, then yes, a 350 is possible. Some company may do that, I don’t know.

In 1968, the 327 switched to 2.45 inch mains. Same as the 350. Swapping out the 327’s 3.25 inch crank for a 350’s 3.48 inch crank will make it a 350 as the 327 and the 350 both have a 4.00 inch bore.

 

Just remember to change the pistons with the crank

 

Short answer, yes.

Of course if your using a small journal 327 it gets harder, but how many guys are using stock parts like cranks anymore in these old motors. You can literally do darn near any combo anymore, just order the crank to fit. (It wouldn’t make sense to mess with a small journal block though anymore, imo).
Days of using different stock cranks and spacer bearings or turning the journals, etc., is simply not cost effective.

And rod length has no bearing (no pun intended) on cubic inches.

 

Also the crank came cast and forged if I'm not mistaken.

 

Sooooo, if you have a pre-1967 327 block with the small journal mains, you could have your large journal 350 crank main journals ground down to the correct main bearing diameter. You would use your 350 rods and pistons and you are home free (almost). Check the clearance on the crankshaft weights to make sure there is no interference with the block (Don't think there will be).

 

Yes. But you would need to re treat the crank (harden), and it’s not even in the ball park of cost effective.

 

The only problem with grinding down a Large journal to Small journal is the new material is softer, or at least this was the excuse a well-known machine shop back home said, aka, the early '70's.
Just make a high-winder, i.e., 302, put a small journal 283 crank. Horsepower is at the upper rpm limit, and be sure to get the rotating assembly and reciprocating assemblies balanced.

 

I would rather have the 327. It revs higher in my opinion.

 

If you are using a pre 68 block and wanted to make it a 350, line bore the block to accept the larger crank.

 

You can buy a 350 short block cheaper then building a 327 into a 350

 

This.

 

Yes to that !!

 

Yeah--Like I said...just a thought. I have a 30 over 350 block on the garage floor, awaiting a project worth assembling it for (have all of the internals already), although I may have to go to 40 over with that block (not sure if a hone will be enough to clean it up)...if I have to go to 40 over, then I need new pistons...at which point, I just as soon pick up the below 327 block and bore it 30 over and save some cash to re-use the pistons, rods, crank I already have...

I got a lead on a '69 327 block that someone is looking to get rid of for like $50...can't beat it, either way!