Replacing flywheels

[JimNolan]

Guys,
   Maybe you can help me out here. I've got a 410 in my 57 Fairlane with manual transmission external balanced flywheel.  If I pulled that engine out and used it in another car with an automatic transmission is there a way that you can balance a flexplate to match the engine without re-balancing the whole (crank, harmonic balancer) assembly again.

[Barry_R]

Bring the old flywheel to the balance shop.
Easy deal...

[NIsaacs]

Just buy a 410/428 flexplate.

Nick

[JimNolan]

Barry and NIsaacs,
    Thanks, I can't find my Bobweight Card but the guy that balanced the engine is alive and kicking and I'll take him the flywheel and have him transfer the balance. Thanks again. Jim

[My427stang]

Jim, bring him both wheels.  I assume you meant that, but just in case. 

[JimNolan]

427Stang,
  Yea, that's what I meant to say. I'm debating taking the 410 out of my 57. It's a sweet running motor but it's just too much for the car. I'm lucky if I get 15mpg on trips and it can't make the car that much faster drag racing because I can't put big enough tires on it. I've still got the 270hp 390 I had in it before and it gives me just as good of 60' times (2.1) as the 410. I'm through drag racing anyway. I've got a 66 Fairlane Convertible I'm restoring now and it will have a C6 in it. I think it will be better suited with the 410 in it. I've gotten as much as 21 mpg out of that little 390 and the car just seems to feel better than the 410 when driving it. I run a 570 avenger on the little 390 and it still sends me through the quarter in 15.2. The best I've gotten out of the 410 is 14.3. Thanks for your help when building that 410. It's a strong motor. Jim

[ScotiaFE]

But gas is getting cheaper. 
A buck 7 a litre here on the shore.

[RJP]

Barry and NIsaacs,
    Thanks, I can't find my Bobweight Card but the guy that balanced the engine is alive and kicking and I'll take him the flywheel and have him transfer the balance. Thanks again. Jim

Most shops that do balancing keep records of each balance job and that should include all the part weights, bobweights, counterweights etc. Several years ago I bought a bunch of parts that included a 428 CJ crank. It had a stamped code that looked vaguely familiar to me. I called the shop that may have done the balance job. The orig. owner had passed away but his son, who now ran the shop pulled the card his dad recorded and kept all these years. He gave me all the balance specs, when it was done and by who. Turned out that crank was done about 30 years prior to me getting it.

[JimNolan]

But gas is getting cheaper. 
A buck 7 a litre here on the shore.

You're right about gas prices. I shouldn't complain because it's got a 7.5 DCR and I can burn Jack Daniels in it if I wanted to. The main reason I'm pulling it is to make sure the cam plug didn't come loose causing an oil leak out the back. It's that or the main rear seal. Before I pull it I'll take the bell housing off and see where the leak is coming from. It's still too much motor for the car but it's a lighter engine and it sure looks good with all that aluminum.

[Lenz]

I remember your oil leak issue from a while back, now you get to put it to bed.  Bet that 410 will do the job in the 66 .