Re: Who makes the best timing chain?
 

As far as vibrations and harmonics effecting chains goes, Pontiac had to come out with a better chain for the 195" 4cyl. which was 1/2 of a 389 due to the vibrations of that engine. The links had a wave type of a flat spring between the links and they would last. They were the chain to use in a Pontiac before the roller chains came out. If anyone on here knows of any GM# 9772801 chains or the version Republic Gear made, please let me know. John Kissel K242

Re: Who makes the best timing chain?
 

I have used the cloyes hex-a-just set ups for years and so far all I have seen is the IWIS chains and have seen no problems.

Like I sais earlier some times if stock cam bearings are used with a high spring pressures the cam bearing will flatten out causing the chain to be lose.

To the OP which cloyes set up did you have??

Re: Who makes the best timing chain?
 

Have one here in original GM box,Keep it for conversion piece,It actually belongs to Allpontiacs,Frank Gostyla ,it is a Morse product,I will check and see if he wants to sell it.Bill C.

Re: Who makes the best timing chain?
 

At one point, Speed Pro came out with a premium quality "link belt" timing set for racing use, it had heat treated steel gears and a premium chain. I know Speed Pro did not make it, not sure if it was a Borg Warner or another brand, Kevin would probably know. It was, however, more expensive than even a Cloyes Tru-Roller, which has been the "gold standard" for decades. Between the reluctance to put a "stock" timing set on a race engine, and the higher price, it did not sell well and they gave up on it quickly.

Yes, Grump ran a stock GM timing set for years, right up until the Jesel came out. It was a little known "hot setup" for a while.