#6223 BB, forged crank question

[Chevy454]

Good info, Paul...I believe the hi-po versons got the same treatment as the 7xxx cranks, except for the counterweight. They're a good crank, and the 1/8" counterweight difference is negated with a balance job...less rotating weight with a 6223, which means free power...

[jerry j]

All BBC # 7114 cranks were crossdrilled & tufftrided from the factory & only installed in original L/88 & ZL/1 427 engines.All GM BBC #6223 cranks that were factory crossdrilled are tufftrided, whether 396 or 427, they came in SPEC HI PERF solid lifter engines only from the factory.
Hope this helps.
Jerry

[jerry j]

Fat fingers the forging # is 7115 for the L/88 crank, it was too late to edit when I saw it.
Jerry

[nuch_ss396]

I have to agree that the 3856223 chankshaft came in both
396 & 427 applications. It has been found in cross drilled,
and non-cross drilled variants along with Tuff-triding
for the cross-drilled version.

I had always thought that the 427's used a different crank
due to what I read in Colvin's book. However, I have found
many Corvette owners with L/71's that had original '6223
cranks. All the L/72's also used the '6223 cranksahft.

Now, for a kicker, the L/34's also used the '6223 crank,
but it wasn't cross-drilled or tiff-trided. I've heard
that some L/34's were found with cross-drilled cranks, but
they definitely weren't tuff-trided. That was a SHP only
option.

Steve

[Bblock]

Originally Posted by nuch_ss396

I have to agree that the 3856223 chankshaft came in both
396 & 427 applications. It has been found in cross drilled,
and non-cross drilled variants along with Tuff-triding
for the cross-drilled version.

I had always thought that the 427's used a different crank
due to what I read in Colvin's book. However, I have found
many Corvette owners with L/71's that had original '6223
cranks. All the L/72's also used the '6223 cranksahft.

Now, for a kicker, the L/34's also used the '6223 crank,
but it wasn't cross-drilled or tiff-trided. I've heard
that some L/34's were found with cross-drilled cranks, but
they definitely weren't tuff-trided. That was a SHP only
option.

Steve

What more can you tell me about the L-34?? I have Alan Colvins book and I saw a section on the 402/427 where it says the 402 3rd lobe is 7/16". Is this true?? I have a 70 SS Camaro L-34 and trying to verify what crank should be in the block, CTX stamping. Would it be the 6223? The only 6223 I have seen is 3/4" wide 3rd lobe.



Any info on these other 402 cast numbers mark with red dot?


Thanks!