Thread: my 355 sounds like a diesel

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Originally posted by j*b
I'm not familiar with the Crane cam you're using but if it is designed for low RPM torque and your static compression ratio is around 10 or 11-1 that could possibly be your problem. The "torque" cams are designed to be more volumetric efficient in the lower RPM ranges and generally work best with static compression ratios ranging from 8.5 to 9.2-1.

You might try dumping some racing gas in it and see if it quiets down. If it doesn't you should probably look for a mechanical cause.

I'm not a first time engine builder and this won't be the last, my engine is a fresh 355 with moley rings TRW forged pistons,floating rods, steel crank, cast Dart 2 heads,with 205 intake and 160 exhaust stainless valves crane energizer cam, , with 1.5 roller rockers, Elderbrock torker2 intake, MSD ignition 6A , with a 750 holley carb compression ratio is 10.14 cranking compression is 185 psi per cylinder the motor is in a 1968 Chevelle 2 door sports coupe with a 4 speed saginaw rear end gears are 411 in a 12 bolt posi with ladder bar suspension motor sounded like it was dieseling while running sound came from below intake I ripped the motor down all I found was cranes lifters had 8 parts to them never seen that before but I totally tore motor down to nothing after 1 and a half hours of running time oil pressure was between forty and up I'm not sure whether it's piston slap or cranes lifters all bottom end specs are perfect PS I'm Canadian my brothers crossing the border at Christmas says he can get me a gear drive for my sbc what do you think of noisy gear drives Thanks to all you guys for your input