LT-1 or LT-4 in tri5

[chevynut]

Does a 90's LT1-LT4 require more firewall clearance than a traditional SBC? I know the block and head castings are the same/similar, but I recall hearing about some additional interference behind the heads. How far forward do you have to put the engine to clear the firewall?

[Rick_L]

LT1 and Lt4 have steam lines that attach to the back of the heads with a banjo fitting. That's what decreases the clearance compared to a traditional SBC.

Usually it's recommended that the engine should be mounted 3/4" forward to help with this. I think the bolt heads would clear on most cars without moving the engine forward but then you couldn't remove the banjo bolts without pulling the engine off its mounts.

[chevynut]

Thaks Rick, I remembered something like that. We put all our SBC engines 3/4" forward. I just wanted to make sure it would clear with the LT engines.

[Maddog]

LT-1, LT-4? You got to be like your buddy Otis and buy a 725hp-572! I was just reading a post that he bought one of those new GM crate engines, they're around $18K I think. Life must be good taking in that sponsor money, won't be long before he see's the light and has his sheep herd start contributing.

[chevynut]

This is for a customer C4 frame, not my car. My Nomad has a Ramjet 502 in it. ;)

[Maddog]

I know, I just thought I take a little dig:p Plus I find the Otis thing amusing.