Eats5.0's

iTrader: (1)

I think I may have screwed up on my cam selection. I am gathering all of the parts required for a s/c 383 project, and was using Desktop Dyno for tuning experiments. Here's what I have, and I think I went way too small. Trick Flow Heads, ported/polished. JE forged 8.8 c/r pistons with Nitrous Series Rings, Eagle Forged Crank, Eagle H beam 5.7" rods, Summit Roller Rockers 1.6 ratio, Holley Stealth Ram w/58mm TB, Accel 36# Injectors, Paxton SN89 with a 9lb Pulley. Hooker Super comp headers (shorties). The convertor will be a Precision Industries 3600 Stall, and 3.27 Gears.
I went with a Comp Cams Xtreme Energy with a 218/224 duration @.50, and a .495/.502 lift with 110 LSA.
I really liked the torque/hp curves with this cam.
Should I have went, or should I go with a more radical 242/248 dur@.50, and .540/.562 lift?? I have a feeling the motor is going to choke itself with the smaller cam. I know I will need different valve springs too if I do this, but if it needs it it needs it.
Thanks in advance,, Tony

RB83L69

Forced induction renders the intake side of the cam almost moot. The engine no longer has to rely on atmospheric pressure to fill the cylinders. It has help.

Blown cars really do need all they can get on the exhaust side though. You can't shove more in if all the old stuff can't get out. With those heads you also can't go crazy with lift; I've never had any myself, but I understand that their design produces clearance issues at higher lift, and so that should be avoided.

I think you could have done better by getting a custom grind, or one of Comp's nitrous grinds, with about the same intake duration or slightly higher, up to 224° or so; those have 12-15° more exhaust duration than intake, to give the spent gas more time to exit.

I also think that the cam you are talking about would be entirely too much to try to get to run right with FI; and doesn't have enough I/E split.