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MotorTrend on MSN1h
Project X Goes Back on the Gas With 1,004-HP ZZ632 Big-Block Swap!For HOT ROD’s 75th anniversary we decided to change our iconic 1957 Chevy long-term project car once again! Some might call ...
MotorTrend on MSN1h
Exclusive Behind-the-Scenes Look at GM’s ZZ632 RSX Big-Block Cylinder Heads!Go inside GM’s Performance and Racing Center to check out the new 1,004-hp crate engine’s revolutionary cylinder heads.
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