SBF Gear Recommendation Please

[FireSale]

Originally Posted by Chris1529

what kind of RPM do think its going to run? I'd look at a 4.86 at least.
probably lean toward 5.14

The Comp Cam that is giving me the mid 12's at 105 ish is a solid roller with a 3000-65000 power band. It's on the way out for another solid roller that will give me at least 7000 in the traps. I'm currently maxing out at 5500 when I hit the lights so I'm not using the power I have on tap. According to AFR the AFR 1399 heads I have will take up to a .600 lift cam. Looking at Crowers that are rated at 4000-8000 and 3000-7000 and Lunatis rated at 4400-7500 and 4400-7200. The Dynamic Compression Ratio from the Crower cams would be 8.9 and 9:1 respectively and the Lunati cams clock with a DCR of 8.6:1.

My block is the Ford Racing M-6010 BOSS302 4 bolt main rig. My machinist went nuts over it. Rods are forged Crower Sportsman from the Accepted Products list and the crank is a forged Eagle. I pulled the heads recently after a season of driving to the track and bracket racing and everything looks brand new.

The bottom end is underused.

I used gear calculators based on 7000rpm and 28 inch tires to determine speeds for gearing. I know it doesn't factor weight and HP, but it was all I could find to mess with. 4.56 gave me 128 and 4.29 gave 136. 136? OOPs too fast, scratch that. 4.86 yields 120 and 5.14 is good for 113.

Dale