I've got a one piece rear main seal (externally balanced) .030 over 350 (355?) in my '88 Formula. This engine was put in place of a former 305 (LB9) and is using the original flywheel to feed power through to the original T-5. The flywheel was resurfaced and checked when I did the engine swap.

I suspect that the stock balancer has gone out as I get an RPM-dependent vibration in the 2K range as I recall; I haven't driven it in nearly a year so I'm not sure of this.

This is not a race car but rather a pseudo-daily driver so I just need something of good quality that will be better than stock.

If anyone has a unit for sale, I'd be interested in knowing about it too.

Thanks,
Paul

 

Got mine from Summit, it was less than 200 bucks, fluid damper.. i think its working good.

 

Seems to me everytime I've looked in my Jegs and Summit catalogs that they only list ones for internally balanced engines (which I assume most racers use) rather than externally balanced as the '87-up stock SBC's are.

If yours is for an externally balanced engine such as mine, I'd appreciate it if you could give me the part number.

As of right now, I'm either going to buy that other respondants stock 350 unit or try the old 305's unit on there. I've confirmed this with my local engine machine shop that there is only a minor weight difference between the 305 and 350 balancers and it would not be hazardous to try it; and it's FREE!

Thanks for your input.

Paul

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'83 Firebird (now) 305 H.O. & 4 speed slush box w/200K and looking for 300K with a MAJOR attitude
'88 Formula (now) 355/T-5 w/120K
'89 Formula 350 w/95K+ and it's for sale

 

ive only heard good stuff about fluid dampr, from a variety of people, i'd go for one of their dealy's