Quote:
Originally Posted by Jims Mongoose
thanks to both Vader and Bad70. Are you saying that even going to 427 from the current 372 Cubic inches will leave me with an unreliable engine? 
My plan was as follows:
Bored to 427, thats 54 more cubic inches and shaved heads for increased compression(not sure how much). This should be good for 100 to 120 horsepower. 
Headers, cam, cold air, tune should be good for another 100 to 120.
That gives me at best 240 horsepower more for 666 horsepower. A little short of my goal, want 750 at the crank. Am I being to conservative on my estimates or just going in the wrong direction. 
Jim  |
You can't bore an LS3 to 427ci. You would either have to hone it to 4.070' bore and use a 4.10" crank, or sleeve the block and then you can go to a 4.125" bore and use a 4" crank. Either way, you will need REALLY good heads and a relatively large cam to make 725hp at the flywheel.
Personally, I like the saying, "there is no replacement for displacement". Years ago, SAM built a 468ci BBC (stock crank, rods, and cheapo KB pistons) with oval port heads (to BBC guys, they're about as desirable as LS1 853/341 castings) and a carburetor and made 636hp. Total cost was probably around $6k for everything.