Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
this came out of a light duty 1975-1987 truck 454ci
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Give me the numbers and last three letters above the timing cover on the block and I can give you more information such as horsepower.
Date code: E 17 8 =May 17th 1978
Block casting number: 14015445.....454........78-90........2 or 4 bolt Truck
TDS523195=VIN serial number match this number to the vin on truck if original.
Head Casting number: 336781 454 73-85 Oval Port Open 113.0cc Valve size 2.06 intake, 1.72 exhaust
Big Block Chevy Cylinder Heads
Open vs. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. Open chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head.
Aluminum heads are very expensive. You'd be better off getting a cheap set of closed chamber oval port heads to raise your compression. You will have to stick with oval port heads unless you intend to change your intake and exhaust manifolds as well.
Check out this article on how to build a performance 454 on a cheap budget.
Here's another good article:
You don't want to raise your compression above 10.5:1 or you'll become addicted to airports for fuel and octane booster.