Michael Johnson
Associate Editor, 5.0 Mustangs & Super Fords
February 22, 2012

On The Dyno
To make sure he wouldn't scatter a short-block during this test, Beefcake selected Manley rods and Diamond Racing pistons to withstand the boost. Topped with the stock heads and cams, the built short-block received its boost from a Vortech JT-Trim. In that form, Beefcake raced the car at the NMRA 2011 Bradenton opener.

The car went back to Finish Line Performance for the RGR/JPC CNC Stage 1 heads and Stage 1 blower cams. The results are shown in the dyno graph from Dog House Racing's Dynojet.

Notice the stock cams and heads give out around 6,600 rpm, but the RGR/JPC heads and cams extend the power band all the way up to 7,500 rpm. In any powerplant, rpm equals horsepower, but when you're relying on crankshaft speed, the higher the rpm the more horsepower is possible. Since a centrifugal supercharger relies heavily on crankshaft speed, the RGR/JPC heads and cams shine even brighter, allowing the Beefcake's engine to rev to the moon and make power all the way up.

Case in point, before the heads and cams were swapped, peak power came in at 6,000 rpm, but with the RGR/JPC heads and cams, peak power moved up to 7,200 rpm. With the stock heads and cams, peak power equaled 585 horsepower, but with the RGR/JPC heads and cams, that number jumped to 637 horsepower. Torque numbers followed suit, up from 486 lb-ft to 504 lb-ft.

Heads & Cams

StockRGR/JPCDifference
RPMHPTQHPTQHPTQ
4,000310.20407.34301.49395.84-8.71-11.50
4,100315.13403.67317.84407.122.713.45
4,200339.34424.28340.32425.530.981.25
4,300364.29444.92364.23444.86-0.06-0.06
4,400377.78450.94379.29452.731.511.79
4,500385.92450.44389.55454.653.634.21
4,600396.55452.74396.26452.44-0.29-0.30
4,700411.47459.80408.73456.74-2.74-3.06
4,800420.26459.86421.43461.121.171.26
4,900434.98466.22436.34467.671.361.45
5,000448.39471.00453.79476.665.405.66
5,100460.04473.74475.11489.2515.0715.51
5,200478.42483.21490.91495.8412.4912.63
5,300491.16486.72502.54497.9811.3811.26
5,400498.06484.40515.93501.8017.8717.40
5,500509.27486.33518.16494.838.898.50
5,600514.23482.29532.16499.0717.9316.78
5,700527.40485.95546.92503.9519.5218.00
5,800535.47484.89554.08501.7418.6116.85
5,900543.84484.12563.70501.8019.8617.68
6,000552.77483.86571.20500.0018.4316.14
6,100562.52484.33584.89503.5922.3719.26
6,200571.38484.04594.95504.0023.5719.96
6,300572.57477.33601.73501.6429.1624.31
6,400581.72477.38607.65498.6725.9321.29
6,500577.62466.73613.59495.7935.9729.06
6,600585.01465.55619.59493.0834.5827.53
6,700579.81454.52625.96490.6746.1536.15
6,800577.25445.87625.37483.0348.1237.16
6,900570.29434.11632.20481.2261.9147.11
7,000573.46430.26628.28471.4054.8241.14
7,100559.91414.17623.19461.0263.2846.85
7,200n/an/a632.62461.45n/an/a
7,300n/an/a635.19457.00n/an/a
7,400n/an/a634.31450.21n/an/a
7,500n/an/a634.88444.60n/an/a
7,600n/an/a629.64435.13n/an/a