z28 harmonic balancer?

[jonboy1216]

does a 68 MO 3817173 have the cooling fins on the back of the balancer? i have seen NOS ones both ways just dont which one is right

[1968 Z28]

My original '68 balancer does not have the fins....Looks like the finned ones were on the earlier Corvettes.

[68Zproject]

My original '68 balancer does not have the fins....Looks like the finned ones were on the earlier Corvettes.

Mine either.

[1968RSZ28]

My '68 Z/28 harmonic balancer is "fin-less" too.

Paul

[jonboy1216]

thanks guys for the info

[GaryL]

What would the fins be cooling?

[JohnZ]

What would the fins be cooling?

Most likely someone thought it would reduce the temperature of the hub, thereby improving the durability of the elastomer material between the hub O.D. and the inertia ring I.D.; warranty and test data probably didn't support the theory, and the fins were removed. Most optional '62-'67 Corvette engines used the 8" balancer with the fins.

[Jerry@CHP]

Have never seen any original 302 with finned balancer.

Jerry

[MyRed67]

What Balancer did the'67 - 302 use?  Was it the same as the 350?

[Jerry@CHP]

350 8" balancer is thinner.

Jerry

[SSMUNDY]

Can anyone tell me what the thickness is of the '67  8" balancer? I need to know the distance between the face of the balancer where the pulley bolts on, and the back side of the hub where it meets the crank?
Thanks,
Sean