Tearing down a 67 330 high compression engine (code G) for rebuild. Am wondering what differences, beside a 2bbl and likely different pistons(?), does it have from the low compression engine (code L). I have one of each and can use the best of the parts. Looks like the block and heads are the same (same casting #'s).
Biggest difference I see is the G code has a harmonic balancer while the L code has none. (internally balanced?).
The G code has 140K on it and was running when pulled. The cylinders mic out as standard and have no ridge. I hate to bore a block if it does not need it. Would just a touch hone do the trick?
Also, I found a good deal of metal chips in the oilpan. Need to source that out.
Any knowledge or advice is, as always, appreciated.

 

The chips are probably not metal, but the plastic from the timing gear.

 

You're right, not metallic. Makes me feel better.

 

This isn't a Chebby. All Olds motors are externally balanced.

 

Thanks, that's exactly what I thought. But this engine has no external balancer, and I read a post on a blog or forum somewhere (lost when my last computer puked) from the previous owner that stated "the engine is at the balancers. That of course is no proof of anything. But I certainly am curious.

Found the link its 442.com. Go to 64-67 then hit Mike Carpenter. Sorry for using your name, Mike but this has been online for about 20 years.

 

Notice offset weight is on the hub? THAT is the "balancer" part. This engine doesn't use a damper. Don't confuse the two. The offset weight is the external balance function. The damper smooths out harmonics. Likely that was less of a concern on the low compression motors that would typically be installed in a low-performance car that never saw high RPMs. Saved a few pennies on each car by leaving it off.

 

Thanks, Joe. Always wondered about that. I can move this from the I don't know column now.

 

The engines are pretty much identical except for piston dish, camshaft profile, and of course pushrod length. And damper/balancer vs balancer only.

Cylinders in good shape, yes, a hone can revive them. New surface requires new rings. You could re-use the HC pistons- clean well, make sure the oil return holes are clear. Assuming ring grooves are not too wide.

Al the usual mitaswells- new bearings, valve job, rockers n pedestals, timing set, your favorite new cam and lifters, etc.

 

Now that the engine is torn down completely, and I have only small chips, What and where is this timing gear? Remember, this was a decent running engine.

 

Note the missing nylon teeth on the cam gear.

 

If your timing gear does not look like the one in Joes' picture, the timing set may have been changed but the pan and oil pickup tube may not have been cleaned up.

 

That's gotta be it cause my timing gear is intact. Thanks

 

Does your cam gear have metal or nylon teeth. I don't think you can even get a replacement gear with nylon teeth anymore.

 

The gear in it is metal. I'm certain now it is not the original.