1976 440 balancing

kinghs95 · Oct 2, 2020

I have a 1976 440 cast crank engine. I want to run it on engine stand and already have bracket to hold starter. I bought internally balanced(0 balanced) flywheel and was wondering if since I’m only using flywheel to break in cam will it be alright or do I need to add weight on flexplate? Also how would I know if it was internally balanced by a machine shop bc I bought it rebuilt but not sure and it’s been a while. I see a hole was drilled on the crank in the back but not sure if it’s to balance it or not? I’m only using it to break in cam at 2000 rpms for 20 minutes or so.

67belvedere/225 · Oct 2, 2020

Make sure you you have a oil pressure guage on it and get pressure before starting it.
dont need to add any weight to the flex, and you added a engine breaking bottle or using a break in oil

kinghs95 · Oct 2, 2020

67belvedere/225 said:
Make sure you you have a oil pressure guage on it and get pressure before starting it.
dont need to add any weight to the flex, and you added a engine breaking bottle or using a break in oil

Yeah I will hook up oil pressure gauge and I have comps cam additive that has zinc that I will use with regular 10w30 oil.

forphorty · Oct 2, 2020

Are you using a flexplate or a flywheel? If using a flexplate, The torque converter would have to be bolted on to engage the starter. A converter spinning on an engine with no transmission will surely be a catastrophe. I would imagine the flexplate bending instantly and a bunch of clanging, banging and metal parts flying across the room.

yella71 · Oct 2, 2020

what does the front balancer look like? if its not been rebalanced for internal it will shake with no weight on the rear of the engine. needs to be figured out before you run it.

kinghs95 · Oct 2, 2020

forphorty said:
Are you using a flexplate or a flywheel? If using a flexplate, The torque converter would have to be bolted on to engage the starter. A converter spinning on an engine with no transmission will surely be a catastrophe. I would imagine the flexplate bending instantly and a bunch of clanging, banging and metal parts flying across the room.

I meant flywheel. That’s my bad.

kinghs95 · Oct 2, 2020

yella71 said:
what does the front balancer look like? if its not been rebalanced for internal it will shake with no weight on the rear of the engine. needs to be figured out before you run it.

69Bee · Oct 2, 2020

You need an externally balanced flywheel for a 440 with a cast crankshaft. That balancer has the offset weight on it, and the crankshaft needs to also. If you will run an automatic behind in in the car, make sure the converter has the weight on it. Throw that additive and oil in the garbage and get proper break-in zinc oil from: Joe Gibbs Driven, Amsoil, Brad Penn, Royal Purple, et al... After you break the motor in, change to a high zinc oil from any of these manufacturers. Don't use the additive, as you can cause yourself problems, just use the zinc oil with it mixed properly and at the proper levels from the start.

6872n73 · Oct 2, 2020

I have ran a 440 with a flex plate and torque converter on a stand at 2k or less with no problems

RemCharger · Oct 2, 2020

I've raced and ran hard a cast crank with the wrong (neutral ) balancing. With small shots of juice. It lived . I then external balanced it and ran it for many years. would I recommend it? No, its ugly.

1976 440 balancing

kinghs95

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67belvedere/225

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kinghs95

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forphorty

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yella71

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kinghs95

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kinghs95

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69Bee

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6872n73

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RemCharger

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