Hey Pontiac gods

[SCOTT SST2871]

I have seen a couple of those motors with just a hub also but,i dont remember the hub looking so much like a stock balancer hub.that looks to me like a balancer with the outer ring missing.ive got a garage full of those engines and parts.i would put a regular balancer on it and not worry about it
scott fifield

[Dave Ribeiro]

Brian,

I agree with Scott , change the balancer to the 6 3/4 " .. I think that is a 5 1/4" balancer , Pontiac has several dia. up to 7 7/8" ... I have changed balancer's many times without a problem on my racecar ... Most of the pontiac's are externally balanced, unless they have had crank & rod work done..
* Stock pan , after trying several stock replacement oil pans that would't line up the bolt holes ... I try the Jegs stock pan, worked great & cost $59 bucks... Perfect fit, I have since ordered another one.. Good luck ,

[Brian Hummell]

thank you scott and dave

after more research last night. i did find a thread on performance years for pontiac. mid year 1976 there was a switch to that hub in automatic with a tall highway gear for the 350s and 400s through 79/80. which this car has 2.73 or 3.08 gears in rear.weight savings and lower rpm. below 2500 rpm. was a bullitin sent to dealers for it.

if i do install a regular 6 3/4 balancer will it throw balance off on crank and rods?

they were supposed to have been balanced before assembly.

maybe it is time to build a 400 or 455 instead.

[Brian Hummell]

side of block does have 350 cast in it.

[Dave Ribeiro]

Brian,


Replace it with the 6 3/4" balancer & you will be fine ....

[Brian Hummell]

only problem is timeing cover between lower tabs is only 6.5 " . will the 6.75 clear these ok?