[ebartone]

A lot to ask here so I'll try to be direct.


1968 GTO
Current Engine 462 Stroker with Iron Heads, full Roller
10.25 Comp, Run mostly on 93 Octane, sometimes race gas for the smell.
4000 pretty hard miles on the engine.
236 / 242 112 LSA Roller Cam
Doug Headers, Performer RPM Intake, Cliff built Quadrajet
Engine Dyno at 495 HP at 5,200 and 600 foot pounds at 4,200 peaks
TH400

Rest of drivetrain last year was stock, with 3.36 rear end.
Last year I had an Auburn Clutch Posi installed and used MT 255/60/15 SS on 15"
My best time was around 12.7 at 108mph

Decided for fun and to improve before I broke something to do a rear end upgrade over the winter. Added:

All Spohn Control arms, Delsphere, QA1 single adjustable shocks, new driveshaft and Strange S60 Rear end. Moved ratio to 3.70 Lots of $

I thought that by moving RPM a bit up the curve I would increase horsepower to the wheels and improve ET. I have since purchased MT Street Pro Drag Radials as well, 275/60/R15

To my Suprise, and I think I'm hooking ok, I've not been able to get under 13 seconds this year, and my 60' time has gotten a lot worse, even with what feels like decent launches.

I'm highly suspicious I shot myself in the foot by going to 3.7 - she seemed, in hindsight, to like the 3.36 ratio.

What do you guys think?

Ed