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Chevy Engine Specifications

Posted in How To on July 29, 2003 Comment (0)
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It's 11:30 at night--you're working in a dimly lit and rather chilly garage assembling the engine you've been diligently working on and compiling parts for over the past few weeks. You've just set the crank in the block and you reach for the torque wrench. But wait! What's the torque specification? Where do you look it up, and who are you going to call at this hour to verify that the specs are correct? Do you guess and continue assembling the engine not knowing if it's all in vain?

We've been there, done all of that. If you're building a V-8 Chevrolet engine, the solution is to tear out (or photocopy) these pages and post them on the wall of your garage, or tuck them away in a safe drawer of your toolbox. Because on these thin sheets of processed trees are all the engine specifications you'll need to complete your engine buildup. We even included production figures, which are handy when shopping for another engine to rebuild or when looking over a used truck to buy.

While this article won't help you remember to install the oil-pump driveshaft or install all the rings on the pistons before sliding them in the cylinders, at least you'll know the correct torque specs and engine clearances.

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Torquing Disclaimer

Torquing fasteners is a method that's used to achieve a preload without actually measuring the preload. This ensures that the bolts or nuts are tight enough to hold the parts in place, but not so tight they're overstretched. The proper torque specification for a fastener depends on the material of the fastener, how it was heat-treated, and how large it is. A factory 11/32-inch rod bolt requires 35 lb-ft of torque while a 3/8-inch bolt takes 45 lb-ft. Change to an American Racing Products (ARP) 3/8-inch rod bolt and the torque specification jumps to 50 lb-ft because the ARP fastener is stronger.

There's also a dramatic difference in required torque when tightening fasteners with various forms of lubrication. In the ARP catalog, it specifies that its 170,000-psi tensile-strength 3/8-inch studs be torqued to 50 lb-ft when using engine oil, but only 35 lb-ft using ARP moly lube. However, both torque readings should deliver 9,200 pounds of preload.

The bottom line is to follow our recommendations unless the aftermarket fasteners you are using come with directions that deviate from our chart, in which case, the specs in the directions should be adhered to.

All V-8 Chevys are the Same

We've included all Chevy V-8s in this article. All of them share bellhousing and motor-mount patterns, so you can swap a 400ci engine from a station wagon into a truck if you want to replace a wheezing 305. This info is also provided so you'll know what was produced in order to avoid less desirable engines.

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