is it in the car? it must be or you would have simply counted them

ok then look at your starter mounting bolts....

1) are they across from eachother diagonally? then its a 168 tooth
2) are they directly across from eahother in a straight line perpindicular to the centerline of the car? then you have a 153 tooth...

 

I believe all of the automatic flexplates (flywheels) are 168 tooth units. The 153 and 168 tooth flywheels were for manual transmissions. If you are running a TH 400 with a small block, are you using big block frame mounts to line up the engine /trans? All TH 400 trans came behind a big block in 67-69 camaros and had the offset built into the crossmember.

 

I believe all of the automatic flexplates (flywheels) are 168 tooth units. The 153 and 168 tooth flywheels were for manual transmissions.

The statement above is absolutely incorrect. Most certainly, at least in 67-68, ALL 327 cars, regardless if equipped with a powerglide, T350, or any/every manual trans came with 153 tooth flywheels.
ALL Z28's came with 153 tooth flywheels.

I'm not sure about the SS350's and BBC's, but believe they came with 168 tooth flywheels.

As was stated in the first reply, the easiest way to tell is to look at the starter.
Starters for 153 tooth flywheels have the 2 bolts exactly 90 degrees from the centerline of the car, and one bolt (outside) is shorter than the other.
Starters for 168 tooth flywheels have the bolts stagered, the inner bolt is ahead of the outer, and both are the same length (long)

 

I did not state my response as a fact. That is why I said "I believe", and it was based on the fact that the local auto parts store only lists 2 flexplates for these models and they are both 168 tooth units. I have never had an automatic. My experiences with automatics have been with a few friends cars with both 327 and 350 engines. They both used the same flexplate.

 

The car is sorta rigged actually, and I think the tranny is a turbo 400 PONTIAC pattern....4 of the 6 mounting studs are being used. Came this way when I bought it and I havent the $$$ to go Chevy 400 yet. There is a freaking mount under the tranny that prevents me even switching the fluid (I need one with a drain plug). When we installed solid steel motor mounts we had to flip them (backwards) and beat in the firewall a little for the HEI.

The main reason I asked this question was I want a high torque small starter because the stock one I have isnt engaging, hahah ... so time to crawl under her and check the studs/mounting points.

But from what Jim said, it sounds like a 153? THANKS GUYS ---

 

39 years is a long time.
If the general built it with a 327, he built it with a 153, but today, who knows?

 

If it's 12-3/4" diameter, its 153-tooth; if it's 14" diameter, it's 168-tooth. :thumbsup: