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ZZ502 Big-Block Engines - Big-Block Bolt-Ons
The ZZ502 Is A Great Crate Engine, But It Can Be Even Better With Just A Few Upgrades.
By
Steven Rupp
, Photography by
Steven Rupp
Camaro Performers
,
July, 2010
The Gen VI block features four-bolt mains and is filled with a 1053 forged steel, externally balanced 4-inch-stroke crank and forged, shot-peened steel connecting rods with 7/16-inch rod bolts. This stuff will easily hold up to a bit more power.
The Gen VI block features four-bolt mains and is filled with a 1053 forged steel, external
Reimann also worked over and opened up the intake and exhaust ports, as well as cleaned up the heads for better flow. When we took the reworked heads to get flow tested at Westech Performance, we found that the chamber size had increased to 117 cc. We suppose we could have milled the heads down to get that compression back, but the small gain in performance didn't justify the cost. Besides, did we mention how our gas in California sucks?
Reimann also worked over and opened up the intake and exhaust ports, as well as cleaned up
Tim Reimann did a valve job, opened up the bowls, back-cut the valves and short-turned the corners back to get better cross flow. He also took out the parting lines, and generally smoothed out any bumps or protrusions.
Tim Reimann did a valve job, opened up the bowls, back-cut the valves and short-turned the
The 4.470-inch bores are filled with forged 9.6:1 aluminum slugs. The relatively low compression assures that this is a pump-gas-friendly mill, even in states where 91 octane pretends to be the good stuff.
The 4.470-inch bores are filled with forged 9.6:1 aluminum slugs. The relatively low compr
When we said earlier that the ZZ502 kit from GMPP came with everything, we weren't exaggerating. Every seal, bolt, plug, and widget needed comes packaged in the crate. water pump, distributor, and plug wires.
When we said earlier that the ZZ502 kit from GMPP came with everything, we weren't exagger
Even supplies like pipe sealant, RTV, and assembly lube are included. The deluxe kit also includes accessories like the starter,
Even supplies like pipe sealant, RTV, and assembly lube are included. The deluxe kit also
After lightly coating the supplied bolts with oil, we installed the now-ported GMPP oval port heads and torqued them per the GMPP instruction sheet.
After lightly coating the supplied bolts with oil, we installed the now-ported GMPP oval p
One of the main keys to making more power was upping the size of the cam to a 242/248 duration, .566/.566 lift, 112 LSA COMP stick. Quite a bit larger than the 224/234 duration, 527/544 lift, 110 LSA cam that came in the engine from GM. This should generate more power while keeping the engine easy to live with on the street.
One of the main keys to making more power was upping the size of the cam to a 242/248 dura
Using the GM-supplied assembly lube, we then dropped in the hydraulic lifters that came in the ZZ502 kit.
Using the GM-supplied assembly lube, we then dropped in the hydraulic lifters that came in
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By
Steven Rupp
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