I may be buying a 327 block, crank rods and pistons here pretty soon, but the guy doesn't know if it's a small or large journal. i looked the casting number up on mortec, and found that the block was used in 67 for 302's 350's and 327's but it didn't say anything about journal size. I believe 67 was the first year for the 350, but i can't remember if it was ever a small journal or not.

Anybody know?

Eric

 

It should be small journal, large journal came in during late 68 and 69.

 

I second. Large journal came in 68. My '67 327 is a small journal.

 

thats what i was fearing, just couldn't remember. I was hoping to buy it and put a 350 crank that i have sitting the garage in it but i guess thats out.

Does anybody make stroker cranks for a small journal block?

Eric

 

You could offset grind a 350 crank to fit the smaller mains and use some weird combo of rods and pistons. Or even offset grind 3.75" crank to 3.80" and use the GM 383 pistons and rods. Or offset grind to 3.87 and use GM 5.94 PM rods and 6" rod 383 pistons or......

But is it really worth it?

 

it's be easy to use a LJ 350 crank in a SJ block. just have the mains ground to SJ specs and leave the pins alone and run stock JG 5.7 rods, or any rod length you want.

 

Yeah but why just grind the mains down, when you could offset grind them down to SJ size.

 

Pretty tough to "offset grind" mains.... you can do that to rod journals though, to increase the stroke, but you need to make sure that whatever you change the stroke to, you can get pistons for.

Or, like ede said, just leave the rod journals alone, and use LJ rods.

However; there was never any such thing as a small journal 350; so if that block could possibly have been used to make a 350, then it has to be a LJ block. Mortec's listings can be a bit ambiguous that way: for instance, it might have been a 350 block in 67 (Camaro SS only) but not a 302 or 327 in that year; and it could also have been a 350, 302 or 327 block in later years.

I don't recognize the casting # myself, so I can't just say it's small or it's large. I would if I could but I can't. Sorry.

 

Measure them

 

Oops that would definitely not work, you know what i meant. I can just see somebody trying to offset grind the mains, what the hell this thing doesn't fit in the block. lol My block must be FUBARed