Internally balancing a Gen V Big Block?

[matchframe]

I am making plans for the machine work of the 454. I met with a machine shop owner (Clear Lake Speed Center) and we talked about what I wanted to do with the Big Block.

My engine is a Gen. V, which means it is externally balanced at the flywheel, and harmonic balancer.

This guy said that we could internally balance and blueprint a Gen. V, but I would have to get a different flywheel and harmonic balancer...which I destroyed tonight and have to get another one anyway.

Should I leave it externally balanced, or should I have it done internally? What are the pros and cons of leaving it externally balanced?


Thanks,
Bill

 

[ShakeRattleRoll]

WOW

Where to start lol. I feel that if it is balanced correctly and that is with the intended flywheel and hat sorry pressure plate and harmonic ballancer I would leave it external. To do it internal requires allot of work and time. I have done it before for very high rpm BB motors and when I say high I mean in the 95OO to 10000 rpm range. But you have to drill out the counter weights on the crank to be able to put in plugs of Mallory metal to correct the weight that will be needed. But since I have not messed with things like that in a few years I do believe that the aftermarket now has internal balanced cranks for a BB. It all depends on what you want to do and how deep your pocket is. But if I was going to go to all that work I would just get a stroker crank and build a 540 or 604. A 604 is a great street motor. On unleaded gas at the pump they produce right at 750hp in street tune. The 604 I mean. If you want to know more just e mail me or pm me and I will give you a friends number that builds those on a regular basis. If you look at Hot Rod he is the one that threw together that 708BB for that 57 studi of Vintage Air. Now that engine was a pain and expensive lol.

 

[wallyknoch]

internal or external

To rebalance the engine to internal will be expensive. So, you can go all the way to a 640 by purchasing a complete internally balanced assembly. Rods, pistons, and shaft. Done with the right camshaft and fuel system the potencial would be mid 10`s at 130 mph or better and still be a street driven machine. Now that would be some serious HP. I know of one machine similarly set up that turns 10.35 at 135 mph on straight motor. The neat thing about this piece is that it`s a heavy ex 440 69 Dodge Charger. The Mopar guys freak out when the hood is off. This car is a solid black very nice piece and done correctly with a roll cage and narrowed dana.

 

[matchframe]

Thanks for the replies!

I think I will stay with the externally balanced. I did not know it was so involved.

The 640 sounds like a radical engine, but I better stay with my original plan of going to a 468 because of budget.

Thanks again!
Bill

 

[GDaina]

if your crank and flywheel are destroyed, then, by all means, get an internal balanced crank, a flywheel and balancer from a 427.

you can get internal balanced cranks in various strokes, 4, 4.25, and 4.5". The price is the same. Keep in mind that if you increase the stroke, you will also have to replace the pistons and rods. If you stay with the 4" stroke, you don't have to change pistons/rods.