balancing 351w

[incoming]

I've been a bowtie guy since the early eighties and am putting together my first SBF from long block with all new parts. I've picked up a new stock 28oz harmonic balancer for it.

My car is an early '90s built '69 block 351w with a toploader. I'm kicking around the idea of an aluminum flywheel.

My replacement is a '94 truck block running a flat tappet cam.

I haven't had my engine pulled yet. I don't know what else is under it. I spun a bearing a couple of months ago and want to basically start all over with everything engine related.

If I have a 28oz harmonic balancer, do I need 28oz weights on the flywheel?

[bobcowan]

Originally Posted by incoming

If I have a 28oz harmonic balancer, do I need 28oz weights on the flywheel?

Absolutely. The harmonic balancer and the flywheel/flexplate must much.

[Jerry Clayton]

Most likely the flywheel will come equipped with a bolt on weight for the counter balance. If your building the engine with all new stuff and going to have it balanced--you could have heavy medal inserted just in the flywheel end of the crank for a neutral balance back there and then you could use a flywheel that was neutral balaned-this method works good for conditions where the clutch /flywheel gets lots of replacing such as in race cars

[olddog]

What oz off balance depends on what the crank was balanced to be.

If you are starting over with a fresh rebuild, and you can afford the cost, have the rotating assemble balanced to 0 off set externally. In other word, have it internally balanced. Then use a 0 offset or balanced harmonic dampener and flywheel.

[flyboyjy]

I built up a 351 last year. Selected all the parts to match then took to a machine shop and had all the components weight matched and balanced. Costs a couple of hundred dollars but well worth it in the end.

[incoming]

Thanks, all.