Poll: Who has ever hit the rev limiter?

[Bob Eyres]

The power doesnt drop off in a stock LT5 before redline.
Unless you go past the power peak, you will be way below it after your shift.


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[Paul Workman]

Well, in a stock motor, one starving for air, BTW, POWER does dip before the 7100 red line. In fact sources including "Mr. Jingles" (one of the (former?) test drivers for GM said he power shifts the ZR-1s @ 6200.

But, your right after the shift puts you right on top of the torque curve and behind the power peak as it is ramping up again.

Porting the LT5 - even (as I am) running stock cams, really turns the BEAST loose, and then the LT5 is just on the crest of the power curve (on a 5.7L motor). Add regrinding of the cams and some judicious phasing and you'll need to reset the cutoff to 7500 or 7600 or more to appreciate what the motor will deliver.

But, you don't have to take my word for it...ask Pete Polatsidis who ran his 5.7L LT5 to the low 11s on a regular basis before dropping in Kevin Costelos' 441 LT5 (that Pete also built).

Pictured are some more or less typical (inertia) dyno graphs showing the before (stock) and after (ported) results. Note the stock engine was cut off at ~ 6300 rpm, but the HP is just seen to be ebbing even then. And, the ported LT5 (before and after) shows the HP is at its crest at the 7000 rpm mark after porting; a significant improvement!