(Hope y'all will entertain a Corvette question...it's VERY L98 related, if not 'maro explicitly.)

I'm building a 383 this winter (Scat crank, forged pistons, 10.5:1, TPIS base manifold, LPE 219 cam) and am looking at the top of the motor now.
The question is:
Siamese runners are about $250. Ported to the stock air plenum will do good things for reducing runner length and improving flow.

A Superram costs about $1200 (or less used). It's supposed to have improved HP and torque over the siamese runners, but I can't get any kind of qualitative numbers. It's a grand worth of motor budget, it's a PITA to install, and it thoroughly covers up everything on the top of the motor.

It sure looks cool though.

In any event, I'm replacing the manifold base, which is the REAL bottleneck, I'm just wondering what the incrimental improvements would be between the rest of the top end. This is for a street car useage, that'll see some medium speed roadracing and low speed autocrossing. It's also an automatic convertible, so I'm not HONESTLY expecting it to be the best racer out there, just as fast as anything on the street with street tires .



[This message has been edited by RocketSled (edited August 21, 2001).]