Some QJ installations were adjusted to conform to the "1 hp per 10 lbs. of chassis weight" GM dictum of the day.
The GTO and Firebird had the same big block motor options, but the weight differed by a few hundred lbs. The GTO got the "normal" QJ for 335 hp, while the Firebird's secondary air valve was set to only open to 80° (more or less) which trimmed off enough peak power to officially conform at 325 hp.
What about the 250" Sprint? 230 hp (special standard shift option) @ 5,400 rpm & 90% VE only needs 352 CFM, but the QJ supplies up to 750 (if the air valve opens fully)?
