MustangMatt1966 said:
aluminum flywheels are not always best, i bought one and had the transmission out and decided not to run it because of the advice given on here and it was the best decision i made.. an aluminum flywheel has less centrifucal force than the steel ones, thus causing the engine to have to rev higher....
Uh, it revs faster, not higher. It will bog more as you don't have the inertia, but in a launching situation, this isn't always bad as it'll help you from blowing the tires off. It probably depends on your operating rpm. The big thing I hear about whether or not to run one appears to be dependant on the weight of your car. Over about 3200#, I don't think you want to run one.
If you never ran the aluminum one, how do you know if it was the best decision?
Not trying to sell my flywheel here, and I'm not sure at what point an aluminum wheel is better than a steel one, but I ran this flywheel behind my race only 289. It was in a 3000# '69 Mach I with a Jerico and a 5.67 gear on 9x30 slicks. We'd launch the car at 6400 and shift at 8000, crossed at 8000 as well. I bought it because I asked my chassis guy what to get and he said to get an aluminum one. He also told me to get a Offy 360 tunnel ram and a pair of 660's (1320 cfm on a 289?!?). I trust him because he's usually right. I asked him what the car would run the first time we took it out and he said 13.50. It ran a 12.51 so he was wrong that time

I'm not racing sbf's anymore, I'm going big block with an FE and I have an aluminum flywheel for it as well. The big block will be in a '63 Fairlane and I'm hoping to keep the full weight uner 2800#.
But I do agree with Matt, ask someone that races a lot more than either of us about what to run. Also, ask a lot of people and sort of take what everyone says and put it in one lump and see what the overall tendancy is, that usually works for me.