My 69 Barracuda fastback runs consistent 11.7s at around 115 to 116 mph. Mild 408 W2 ,10.5:1 comp engine with 3000rpm converter and 3.91 gears. Car is all steel and weighs 3300LBS without me in it.
Would i like it to be faster, yes, but it is such a great street car that has been going strong...
First gear is going to take you to just over 60mph with those tyres at 4500rpm and with the weight and gearing of the truck currently im not sure how much faster than that it will go over the quarter?
If you cant find a really cheap diff centre for it i would be putting the smallest 15 inch...
What range of diff gears did these trucks come out with originally?
2.71 with a 31 inch tyre you arent even going to see much of second gear over the quarter mile!
Some rough maths with a 28" tall tyre and 5.13 gears would give you 6160rpm at 100mph over the eighth mile with no converter slip at all. If you estimated say 5 percent slip it would be just under 6500. If you are aiming for more mph it could be up to 7000rpm so i think 5.13 would be good over...
Heads : With the low compression pistons in your engine i think you are going to need a very well ported / good flowing set of 360 cast heads or the promaxx alloys (also well ported) so you dont need to big a cam which wont like the low comp and then have to run a very low set of gears.
My...
69 Barracuda Fastback - full street trim (tools in back...)
408 with stock W2 heads,no porting and standard valves
Comp 248 solid flat tappet, 10.5:1 comp, TTI step headers.
727 / 3000rpm converter
3.9:1 gears
Stock suspension
11.7 at 115.5mph
Go the VC!!! Brings back memories of me racing my 340 / 4spd VC at the drags back in the mid 90s. Just bought mine back after 6 years of it being it Melbourne minus motor and box and I'm going to build it again.
That cam is huge for a 318, my 340 with mild j heads, block huggers and a...