Damper spacers for serpentine belts?

[sweet88coupe]

your running a 351W? Your engine guy must have ground the whole crankshaft down to balance your combo, because the 302 uses a 50 ounce/inch imbalance, while the 351W uses a 28 ounce/inch imbalance, making the 302 dampner nearly impossible to use. the correct dampner for the engine (FRPP) is part #m6316c351 and yes you will need a spacer which is part # m8510c351 (.875" thick)or m8510b351 (.950" thick). You can get around all this FRPP stuff by finding a '75-'80 302-351 dampner that measures 3.95" from the mounting face to the end of the snout with a four bolt pattern.

------------------
'88 coupe
351W (.060" over)
trickflow "R" series heads, 1.6 ratio crane gold series rockers.
Miloden 7qt oilpan
trickflow street series intake, with 70mm throttle body, and 77 Pro-M mass air meter.