Flywheel Weight for 67 BB

[Howard P.]

Does anyone know what the flywheel weight would be for the 67 BB application. Does it differ between 400 and 435 HP cars ?

[Clem Z.]

Re: Flywheel Weight for 67 BB

Does anyone know what the flywheel weight would be for the 67 BB application. Does it differ between 400 and 435 HP cars ?

the only BB corvette that had a light weight flywheel(15#) from the factory was the 1965 425 HP 396.

[Joe L.]

Re: Flywheel Weight for 67 BB

Does anyone know what the flywheel weight would be for the 67 BB application. Does it differ between 400 and 435 HP cars ?

Howard-----


The weight of the flywheel used for all 1967 big block applications EXCEPT L-88 is 28 pounds.

[Joe C.]

Re: Flywheel Weight for 67 BB

Does anyone know what the flywheel weight would be for the 67 BB application. Does it differ between 400 and 435 HP cars ?

Same weight for both, which is standard weight of about 25-30 pounds.
The 15 pound flywheel was only used on L88 for 1967.

[Joe L.]

Re: Flywheel Weight for 67 BB

the only BB corvette that had a light weight flywheel(15#) from the factory was the 1965 425 HP 396.

clem-----


....and 1967-69 L-88 and ZL-1.

[Howard P.]

Re: Flywheel Weight for 67 BB

Thanks very much, I thought it was in the 30 Lb range but wasn't sure. I'm considering an aftermarket unit however most seem to be in the 30 to 32 lb range. I'm not sure if that would be a good choice for the car.

Does anyone have thoughts or experiences with a heavier than stock weight flywheel ?

[Clem Z.]

Re: Flywheel Weight for 67 BB

if you plan on running say a 3.08 rear gear and a close ratio trans the heavier wheel will help launch the car from a dead stop

[Howard P.]

Re: Flywheel Weight for 67 BB

Clem

The car is a 4:11 Rear car (435 HP).
Thanks for your comments

[Clem Z.]

Re: Flywheel Weight for 67 BB

with that combo i would install the 15# GM flywheel part #14085720 and get the benefit of the faster acceleration

[Michael H.]

Re: Flywheel Weight for 67 BB

with that combo I would install the 15# GM flywheel part #14085720 and get the benefit of the faster acceleration

Me too. Love that 15# wheel. Only problem for the 435 is, the 15# wheel is the small diameter and a 435 needs a large diameter.

[Joe L.]

Re: Flywheel Weight for 67 BB

Me too. Love that 15# wheel. Only problem for the 435 is, the 15# wheel is the small diameter and a 435 needs a large diameter.

Michael-----

The L-71 originally used a 14", standard weight flywheel. However, the 12-3/4", 15 pound GM #14085720 can be used on an L-71. It requires changing the bellhousing, starter, and, of course, clutch. Personally, I'd never make that change, but it can be done.

[Howard P.]

Re: Flywheel Weight for 67 BB

Thanks for all the feedback. I will stay with the 14" flywheel combination and perhaps go with a 30 lb aftermarket billet flywheel which will provide durability and the added safety of the SFI rating. The car has been raced previous and had utilized a light weight aluminum flywheel, but those days for this vehicle are over.

Again many thanks

[Warren F.]

Re: Flywheel Weight for 67 BB

Joe,
Just for comparison sakes, the unique dual plate clutch flywheel weighs 23.4 lbs.

[Joe L.]

Re: Flywheel Weight for 67 BB

Thanks for all the feedback. I will stay with the 14" flywheel combination and perhaps go with a 30 lb aftermarket billet flywheel which will provide durability and the added safety of the SFI rating. The car has been raced previous and had utilized a light weight aluminum flywheel, but those days for this vehicle are over.

Again many thanks

Howard-----

I don't think they'll be any significant difference in performance with a completely stock flywheel versus the 30 aftermarket unit. Any difference in weight is not enough to be a factor. I think that steel flywheels are a good choice assuming that with respect to important dimensions, they are identical to stock. I would NEVER use an aluminum flywheel for street operation.

[Joe L.]

Re: Flywheel Weight for 67 BB

Joe,
Just for comparison sakes, the unique dual plate clutch flywheel weighs 23.4 lbs.

Warren-----


I assume that you're referring to the GM #3992094 used for 1971 LS-6 rather than the GM #3955151 used for 1969 MA-6? However, I would expect the two to be very close in weight with the 3992094 being a tad heavier due to the counterweight.