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BigBlocksRule · 03-06-2014, 09:06 AM

I have a new block and pair of heads, probably going to go with the 4.125" stroke to make a square motor, 441 cubes. Cylinder walls are longer than other production blocks, which allows for longer stroke without pulling the piston out of the bottom of the bore. Sleeves are more brittle than other LS engines, so detonation will kill them pronto. Other than that, they're reliable to around 900hp. I'm not far from Texas Speed, they have quite a few that are doing well. Valvetrain and valve guide issues are no more common in LS7's than LS3's.
Other than a show piece, I don't see any reason to drop one into a truck. They are NOT the block choice for big power race engines, but they're a great street/strip mill.
Mine is reserved for a '40 Ford Coupe, there's one in a field not far away, just waiting for the old fart to kick the bucket so I can snag it from his heirs.

03-06-2014, 09:06 AM	#13
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: anybody do an LS7 swap yet? I have a new block and pair of heads, probably going to go with the 4.125" stroke to make a square motor, 441 cubes. Cylinder walls are longer than other production blocks, which allows for longer stroke without pulling the piston out of the bottom of the bore. Sleeves are more brittle than other LS engines, so detonation will kill them pronto. Other than that, they're reliable to around 900hp. I'm not far from Texas Speed, they have quite a few that are doing well. Valvetrain and valve guide issues are no more common in LS7's than LS3's. Other than a show piece, I don't see any reason to drop one into a truck. They are NOT the block choice for big power race engines, but they're a great street/strip mill. Mine is reserved for a '40 Ford Coupe, there's one in a field not far away, just waiting for the old fart to kick the bucket so I can snag it from his heirs.