Question for Engine Gurus, Timing/Balancer
Back story: 66 Convertible. C4 trans, thought I had the original 289. Pulled motor for rebuild and everything stamped 302. 302 crank, heads etc. Casting on block for a 1969 302. So, not original.
Problem: Machined block .20 over. Installed a Comp Cams Nostalgia kit. The timing setup is a double chain as opposed to original single chain. The smaller pulley has three locations to install on shaft where original only had one. From our research we used the rounded looking middle slot, which said it was for 0 degrees or TDC. Everything lined up perfect and number 1 piston is verified at TDC.
The timing pointer on my motor was missing, so I replaced it. Bought a stock replacement harmonic balancer. It is speced for a 289 as I bought it before I knew what I had. Visually, looks identical to what I took off. It is a 28oz. When installed, the pointer does not point at 0, but at about 9 degrees retarded. I slid the old crusty balancer on and it does line up perfectly at TDC on the timing marker.
Searched on Summit and found a different model number from same manufacturer. According to specs it is for a 1969 302 as opposed to the 1966 289 balancer I have. Same weight and bolt pattern (3 bolt). So, I ordered it. The new unit is slightly larger (around .10 inches). It has not come in and will not try to install until this weekend anyway.
My searches on here make me question if the new balancer will be any different as I've read they are interchangeable.
Anyone have any input or suggestions? Is there indeed a difference in the balancers?
1966 Mustang Convertible