BBC 454 setups

[Mike C]

No input on the EFI, but I have two different 427's. An original L36 390hp from a 69 Corvette .030 over with the L2300 forged pistons that has the smallest Comp Cams hydraulic roller nitrous cam. 224/236 @ .050 113 LSA with 10:1 compression. I plan to install this with a TH200 4R and a set of 3.73 gears in my '69 short step.

The other is a cobbled together 427 with a '76 454 block, GM steel crank, and a set of mildly worked 781 heads that was in a boat. .060 over and L2300 forged pistons. It has a Comp marine hydraulic roller 230/236 @ .050 112 LSA with 8.75:1 compression. This ran 10 mph faster than a 330 hp 7.4l Mercruiser in a 26' boat so realistically 450ish hp. It's going in my Corvette with a McLeod street 5 speed behind it and 3.70 gears.

Both of these cams were chose with the intent of having good street manners. When I bought the nitrous cam the marine cam was my other choice. I stumbled into the second motor which already had the marine cam in it, so I at some point can compare directly. Both cams should be FI friendly.

I have run the former boat motor on my test stand. It sounds wicked and idles quite well at 700 rpm without a transmission attached to it. Should be a hoot in the 3000# 'vette. Now if I can just get my teenagers '72 Jimmy project wrapped up...