I guess the question is.......with all else equal how much extra power would a 74 make over the 67? I know there are lotsa variables and it is pretty much impossible to answer. But lets say it made 500 rwhp at 8 psi with the 67, with the improved airflow of the bigger turbo.....what would it do at say 12 psi and the 74?
1993 AWD 2 door S10 Blazer. Stock 5.3/4l80e
1994 LWB Truck-Worlds Fastest Work Truck!! Built 370 with LS9 cam/front mount 76mm, built 4l80E with Precision/Circle D 3000 converter and JakeBrake. 10.92@126