While the Vortec and LS engines have several differences-- notably, Vortecs are cast-iron blocks while LSes are aluminum -- the primary difference was in application: GM branded their truck and ...

all-aluminum Anniversary 427 Big Block crate engine – based on the legendary ZL-1 – will be auctioned during the Barrett-Jackson auction on Friday, January 18 in Scottsdale, Arizona.

For the ZZ6, Chevy is working to improve the Small Block's high-rpm performance. To make that happen, the engine has Fast Burn aluminum cylinder heads and an updated valvetrain inspired by the LS ...