66 Small Block Exhaust Clamps

[Donald H.]

The 66 and 67 TIM&JG describe and show pictures of the guillotine style clamps. The AIMs has part numbers U-Bolt=3853726 and Clamp=2385666 for the forward clamp and part numbers U-Bolt=3791371 and Clamp=3791357 for the rear/exhaust tip clamp. The TIM&JG simply states that the exhaust tip clamp is "...the same guillotine style clamp as described above".

For the manual transmission cars, these were 2 1/2" clamps.

Since there are two different part numbers in the AIMs, I assume there were two different Clamps. What was the differences?

Thanks

Don

[Gary B.]

Re: 66 Small Block Exhaust Clamps

Don,

The clamp for the exhaust tips is 2.0". As you said, the clamps at the connection between the front and mid-pipes for manuals transmission '66 ad '67 is 2.5". The 2.5" clamps uses flanged nuts (still available from GM # 1359887) with no lock washer; the exhaust tip clamps uses regular nuts and a lock washer.

Gary

[Donald H.]

Re: 66 Small Block Exhaust Clamps

Thanks Gary. I should have just measure my tips!

I wasn't sure since my car had an under car baffled exhaust system when I purchased it.

I'm going to order a set of the clamps that Greg Thompson is advertising the the Driveline.

Don

[Gene M.]

Re: 66 Small Block Exhaust Clamps

Understand on 65 and back the base engine used 2" pipes all the way back on both 3&4 speeds. As did the SB automatic tranny cars.