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Old 05-02-2012, 05:13 PM
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454 Timing Question

I have a Chevy M1008 truck with a 6.2 diesel and i'm replacing the diesel with a 454. The 454 has a little over 80K on it and before i put it in the truck i'm replacing the gaskets and getting rid of the nylon timing chain and oil pump shaft setup. The engine is stock low compression peanut port engine with just an Edelbrock airgap intake and 750 carb that will have hedders and a 2 1/2" exhaust. I am getting ready to install the new timing chain which has the 3 key ways, 4 degrees retarded, advanced, and straight up. I'm more concerned with torque so i was going to install the crank gear advanced 4 degrees, however i see many people recommend putting it in straight up. By installing it advanced 4 degrees would that not make the torque curve begin sooner? Thanks.

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Old 05-02-2012, 09:47 PM
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Quote:
Originally Posted by turchiac
I have a Chevy M1008 truck with a 6.2 diesel and i'm replacing the diesel with a 454. The 454 has a little over 80K on it and before i put it in the truck i'm replacing the gaskets and getting rid of the nylon timing chain and oil pump shaft setup. The engine is stock low compression peanut port engine with just an Edelbrock airgap intake and 750 carb that will have hedders and a 2 1/2" exhaust. I am getting ready to install the new timing chain which has the 3 key ways, 4 degrees retarded, advanced, and straight up. I'm more concerned with torque so i was going to install the crank gear advanced 4 degrees, however i see many people recommend putting it in straight up. By installing it advanced 4 degrees would that not make the torque curve begin sooner? Thanks.
Advancing the cam in theory will lower the power band a couple hundred rpm and it tends to increase the dynamic compression ratio. I'd want to run the numbers to be sure this increase won't cause you trouble w/detonation or an increase in octane. I doubt it will, given the relatively low static CR the engine probably has, but it's worth mentioning. That said, if it's a stock cam I'd install it straight up. There may be some disagreement about this, so see what else is said.
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Old 05-03-2012, 10:01 PM
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most likely will not make much of a difference.

straight up should be fine.

stock timing chains retard timing by 4 degrees.

fyi, compcam grinds in 4 degrees advance even in their little cams.
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Old 05-03-2012, 10:12 PM
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is the cam yor using alreadt ground on a 4 degree advance? if its not then go ahead and advance it the 454 with peanut port heads were low compression engines and the advance wont hur it a bit.

if you dont like it you can always change it back for the price of a new gasket
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Old 05-03-2012, 10:38 PM
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Not sure if the cam is ground with any advance, it's the factory 454 truck cam. I'll set it at 4 degree advance and see how it runs, and adjust it if necessary. Thanks.
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