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0307htp Holleystealth13 Z

Looking inside the IROC, the B&M MegaShifter (using a Pro Ratchet shifter ball) and the little black box in front of the shifter are the only indications the IROC could pack a punch. The black box (for track-only use) toggles in a couple of resistors (one variable) that can help consistency when bracket racing. It was not used for this series of tests.
Holley StealthRam Intake - Ram That TPI!

 Looking inside the IROC, the B&M MegaShifter (using a Pro Ratchet shifter ball) and the little black box in front of the shifter are the only indications the IROC could pack a punch. The black box (for track-only use) toggles in a couple of resistors (one variable) that can help consistency when bracket racing. It was not used for this series of tests.  View Related Article

 

 

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