Source a Small Journal SBC 350" Crankshaft

Larry Fulton · 10-14-2010, 08:03 PM

I've got a really nice Small Journal 327" block that I want to build into a 350" or bigger... Whats out there and avail?

Thank You in advance!!

Larry

Tom keedle · 10-14-2010, 08:20 PM

Quote:

Originally Posted by Larry Fulton

I've got a really nice Small Journal 327" block that I want to build into a 350" or bigger... Whats out there and avail?

Thank You in advance!!

Larry

there's NO OEM small journal 350 cranks.
i'd think aftermarket only..

Jeff Lee · 10-14-2010, 10:56 PM

Put a 283 crank in it and have fun!

Tom keedle · 10-15-2010, 04:42 AM

Quote:

Originally Posted by Jeff Lee

Put a 283 crank in it and have fun!

uhh, he wanted bigger but i agree with you

Owen S Quirion · 10-15-2010, 07:51 AM

Jeff, Great Idea, I did a 302 for a customer of mine last year with a .650 lift roller, some Dart Heads, and a Tuned Port Injection set-up. It runs on E85 and sounds like an Indy Car. It is in a 67 Camaro Street Car with a flat hood and 4-speed. Fun car.

Tom Meyer · 10-15-2010, 08:28 AM

If I remember right will the big joural crank swing in a small journal block with out a lot of grinding, some 283 s won,t take a 327 crank.

Dwight Southerland · 10-15-2010, 10:08 AM

I don't know if there is a readily available small journal aftermarket crank with that stroke. It is not difficult to have a 350 crankshaft machined to fit. If you do that, you could then use small journal rods to make the historically infamous "9/16 stroker" and make 368 cubic inches. Tom Meyer is correct, you should check clearance in the crank case before you start assembling.

Larry Fulton · 10-15-2010, 10:38 AM

Quote:

Originally Posted by Tom keedle

there's NO OEM small journal 350 cranks.
i'd think aftermarket only..

I believe your quote is incorrect...

The first 295HP / 350" in '67 were o.e.m. assembled Small Journal Cranks...
It wasn't until jan / feb '68 production that GM went to the Large Journal 350"...
Dwight, is my memory correct?

(I'm done with the 283" stuff / just sold the 721 blocks, cranks, etc that I had been sitting on forever)

Thanks again! Larry

Mike Pearson · 10-15-2010, 11:34 AM

Quote:

Originally Posted by Larry Fulton

I believe your quote is incorrect...

The first 295HP / 350" in '67 were o.e.m. assembled Small Journal Cranks...
It wasn't until jan / feb '68 production that GM went to the Large Journal 350"...
Dwight, is my memory correct?

(I'm done with the 283" stuff / just sold the 721 blocks, cranks, etc that I had been sitting on forever)

Thanks again! Larry

If you could find one it would be extremely rare. I have never seen a small journal 350 crank. You would be much better off using a 4 bolt main block. Unless you have one of the very early 327 blocks they are not reliable. I ran them for several years in my car and had lots of split cylinders. Switched to large journal cranks and 4 bolt blocks no more problems. Better yet get a bowtie block.

Larry Fulton · 10-15-2010, 12:25 PM

Quote:

Originally Posted by Mike Pearson

If you could find one it would be extremely rare. I have never seen a small journal 350 crank. You would be much better off using a 4 bolt main block. Unless you have one of the very early 327 blocks they are not reliable. I ran them for several years in my car and had lots of split cylinders. Switched to large journal cranks and 4 bolt blocks no more problems. Better yet get a bowtie block.

Good advice!

10-14-2010, 08:03 PM	#1
Larry Fulton Member Join Date: Oct 2003 Posts: 271 Likes: 54 Liked 0 Times in 0 Posts	Source a Small Journal SBC 350" Crankshaft I've got a really nice Small Journal 327" block that I want to build into a 350" or bigger... Whats out there and avail? Thank You in advance!! Larry __________________ Larry Fulton

10-14-2010, 10:56 PM	#3
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Source a Small Journal SBC 350" Crankshaft Put a 283 crank in it and have fun! __________________ Jeff Lee 7494 D/S '70 AMX

10-15-2010, 07:51 AM	#5
Owen S Quirion Junior Member Join Date: May 2005 Location: Captiol District of New York Posts: 71 Likes: 0 Liked 0 Times in 0 Posts	Re: Source a Small Journal SBC 350" Crankshaft Jeff, Great Idea, I did a 302 for a customer of mine last year with a .650 lift roller, some Dart Heads, and a Tuned Port Injection set-up. It runs on E85 and sounds like an Indy Car. It is in a 67 Camaro Street Car with a flat hood and 4-speed. Fun car. __________________ BF/S 1985 Grand Am 3.0 V6

10-15-2010, 08:28 AM	#6
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 936 Likes: 78 Liked 354 Times in 120 Posts	Re: Source a Small Journal SBC 350" Crankshaft If I remember right will the big joural crank swing in a small journal block with out a lot of grinding, some 283 s won,t take a 327 crank. __________________ Tom Meyer 5240 SS Stock ???

10-15-2010, 10:08 AM	#7
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,001 Likes: 64 Liked 779 Times in 193 Posts	Re: Source a Small Journal SBC 350" Crankshaft I don't know if there is a readily available small journal aftermarket crank with that stroke. It is not difficult to have a 350 crankshaft machined to fit. If you do that, you could then use small journal rods to make the historically infamous "9/16 stroker" and make 368 cubic inches. Tom Meyer is correct, you should check clearance in the crank case before you start assembling.