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So, first thing's first deciphering this drivetrain. I have a brand new flywheel ready to install, but I see this:
This thing
Do I need that hatchet blade-shaped thing on the crankshaft? If not, how do I remove it? I also found that weird aftermarket plate just above it, don't know if I really need it.
please explain 625? that is a big block. i have never seen a 383 add-on weight put on a big block crank. you need to tear this beastie down and figure out what the heck is in there. that welded-on external weight i have also never seen before. but removing it will drastically alter the balance. at the very least this guy needs the rotating assy balanced-new flywheel, harmonic balancer and all. may be better to go with a different crank altogether.
Wow.....that's a new one.
So this must be an external balance Big Block......and the above mention of this being for aluminum flywheel fits.....the weight has to be somewhere else than the flywheel.....so they welded a huge weight on the crank and used that balance plate shown in your pic. Scary.
I think I would go to a regular external flywheel and grind the weight off......but first, where did this come from, what is it......and what info do you have at all on it?
..but first, where did this come from, what is it......and what info do you have at all on it?
Jebby
This is my recently deceased father's car. I'm still compiling information about it, finding various parts & invoices in the garage & house. I'll be adding everything to my account's album to figure things out.
Looks like somebody's balance job when using mis matched rods and pistons (heavy) then just do what you can to the crank to make up for it , McLeod aluminum flywheels have a steel bolt on weight for external balance
Looks like somebody's balance job when using mis matched rods and pistons (heavy) then just do what you can to the crank to make up for it , McLeod aluminum flywheels have a steel bolt on weight for external balance
Yeah, but wouldn't it actually be easier to use Mallory metal directly on the crank?
625HP with iron heads means some serious work went into this. And still 625 may be optimistic. At any rate it is probably a radical build to get anywhere near that number. A 454 has an external balancing weight vaguely similar to that, but only vaguely.
I would have a hundred questions:
What do you know about the engine?
Does it run?
How well?
Is it what you want?
If you have too many "no"s I would take it apart and figure it out!
Check the bore & stroke, piston tops & combustion chambers. Take a good pic of the entire crank to share. I would even throw a degree wheel on it and figure out what the cam is like.
Then we can help.
you have to start from scratch with this motor. tear it down and see what you have for bore, stroke, pistons, rods and that crankshaft. if all that weight was added to the crank to run an aluminum-i assume neutral balance-flywheel, you can run no other flywheel. including the new flywheel you just bought. 625 hp is doable with a 454. but that rotating assy has to be redone.
That counter weight would cut your leg off if it ever separated from the crank at 6500 rpm , it might be worth X-raying the crank or just replace the rotating assembly like mentioned if you really want to use it
Yeah, but wouldn't it actually be easier to use Mallory metal directly on the crank?
Some external cranks will not balance without a buttload of Mallory…..and the metal itself is expensive as well as the procedure to do it….as much as a new premium 4340 crank….if it took say…three or four slugs….
My feeling is that Bubba knew this and decided this was the way to go…..but ummm….it isn’t.
I would not run this in its current state….
another WAG
Perhaps previous mechanic/assembler didn't have an external balance flywheel (454) on hand; but forged ahead as best he could with what resources he had ?
If the crank's flange were restored and a standard 454 external balance flywheel were installed, perhaps motor will be OK ?
Was your late father actually a pretty good mathematician ?
Project 625 - Do I need this hatchet?
