496 to be DYNO'D!

[GMR-PERFORMANCE]

With timing locked out and slicks it may not work as well as you want it to.. Locked Vs unlocked is a whole chevy ford deal.

[Bad70sbchevy]

Actually unlocked is the "ideal" setup since you don't need as much advance down low, but for a strip truck where you spend most of the time in the top end in you power band, the optimum timing does not vary hardly at all with higher rpm so you can get away with locked timing since the motor hardly spends any time in the lower rpms (or none with a high stall TC).

[GMR-PERFORMANCE]

If the convertor is right and the tires gear ratio and tire size etc works then yes you can keep timing locked however when things are not "perfect" if the engine bogs for what ever reason you are done .. way too much advance for given rpm etc. I would unlock it while you get the set up dialed in then once you are in the ball park then lock it out. But I see a plate on that truck so it does get driven on the street correct??

[bbcmudtruck]

Well my guess from after talking to mark is that your running an ISKY hyd roller. Thanks for clarifying the fuel pump for me, wanted to be sure I had the right one. As far as the timing goes, a street ride should definitely have the vacuum advance hooked up. However its his motor and the fella who built it for him is more than knowledgeable. If I were guessing, its still timed exactly how it came off the dyno. Just be sure mark knows that your driving this thing out on the street! That little bit of info needs to be relayed to the builder.