rumblebox
Full Access Member
- Joined
- Feb 13, 2015
- Posts
- 164
- Reaction score
- 44
- Location
- Victoria, TX
- First Name
- Carlton
- Truck Year
- 74
- Truck Model
- K20
- Engine Size
- 468
I'm starting a new thread, since practically everything about the build changed, and i can't edit my OP.
The engine that came out of the truck was trashed. The knock ended up being a loose rod cap, which ultimately introduced the #1 rod to the #2 cylinder.
So i found a big block in a 79 Z28 that was supposedly a 496. We pulled the engine, and i tore it down at the house. It ended up being a 454....... with a broken oil pump shaft. The rings cam off in about 6 pieces each, but ths crank was barely scratched. Then i looked closer at the crank and saw that it was forged. Then i looked at the date on the block, heads, and crank, measured the bore and found that it was a standard 1973 454 from a truck. It also had 049 heads that were in way better shape than my old 781's with sunken valves. So i wasn't so aggravated anymore about buying a smoked engine for $400.
The cylinders were pitted from sitting outside with water in them prior to being installed in the Camaro, but it still made .060 over. The heads needed a couple of valve guides and hardened exhaust seats, but they were fine too. The crank easily made .010" under. The thumb rods were fine too.
I originally tried to apply LSX logic to this build and wouldn't really listen to anyone who told me to keep the compression down due to dogshit burn chambers, but i ultimately came around and built it very mild knowing it'll still make crazy torque and decent HP.
-.060 over flat-tops instead of domes
-no decking of heads of block was necessary, which i regret now that i know the pistons are .037" down the hole, making it 7.8:1.
-"RV" cam
-1 3/4" headers
-air gap knockoff
-Holley Sniper EFI
-drilled block for parallel cooling
The engine that came out of the truck was trashed. The knock ended up being a loose rod cap, which ultimately introduced the #1 rod to the #2 cylinder.
So i found a big block in a 79 Z28 that was supposedly a 496. We pulled the engine, and i tore it down at the house. It ended up being a 454....... with a broken oil pump shaft. The rings cam off in about 6 pieces each, but ths crank was barely scratched. Then i looked closer at the crank and saw that it was forged. Then i looked at the date on the block, heads, and crank, measured the bore and found that it was a standard 1973 454 from a truck. It also had 049 heads that were in way better shape than my old 781's with sunken valves. So i wasn't so aggravated anymore about buying a smoked engine for $400.
The cylinders were pitted from sitting outside with water in them prior to being installed in the Camaro, but it still made .060 over. The heads needed a couple of valve guides and hardened exhaust seats, but they were fine too. The crank easily made .010" under. The thumb rods were fine too.
I originally tried to apply LSX logic to this build and wouldn't really listen to anyone who told me to keep the compression down due to dogshit burn chambers, but i ultimately came around and built it very mild knowing it'll still make crazy torque and decent HP.
-.060 over flat-tops instead of domes
-no decking of heads of block was necessary, which i regret now that i know the pistons are .037" down the hole, making it 7.8:1.
-"RV" cam
-1 3/4" headers
-air gap knockoff
-Holley Sniper EFI
-drilled block for parallel cooling
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