which cubic inch?

[richie 2]

tks. bill... trailered super pro car with appx. 5.13 gear. would love to run 10;5;1 w/alm. head on pump fuel. just not sure which cubic inch will get me to high tens easier. going to build either engine with forged crank/h beam/srp components.

[joelster]

You can go much higher than 10.5-1 on pump gas. I run 93 octane and i'm at 11.77-1.

[TDCRACING]

I know my opels lite at 2100 pounds with me in it but I have a little 355 with the first dart heads they made running on sunoco ultra with a 650 holley, 4500 stall conv ,430 gears and im running 10.20's at 132 mph. Nothing more than a street motor would be and very dependable. Dave

[Bill Baer]

Originally Posted by richie 2

tks. bill... trailered super pro car with appx. 5.13 gear. would love to run 10;5;1 w/alm. head on pump fuel. just not sure which cubic inch will get me to high tens easier. going to build either engine with forged crank/h beam/srp components.

Well if it's a heavy car (>2500#) with an automatic the stroker is the way to go.
The reason I question pump gas is unless you keep the cylinder head temp around 160-170 at launch you will be flirting with detonation past the 1000' mark and with open headers you can't hear it. And if you detonate it long enough you will break it. Is saving $$on fuel worth risking your motor?

Perhaps if it's available in your area, you could
consider E-85? It's cheap and will allow you to run 12:1 and run a little cooler. But there are some pitfalls with E-85 such as the expense of converting your carb and the need to test the fuel before you buy it as the percentages of gas to eithanol can vary.
But it's something you can consider.

[1299]

you can run pump gas without a problem. my buddy has just over 1000 run on a 383 that goes 10.20s at 3200lb. and he stage at 110-120* all motor with a th400

[richie 2]

thanks everyone...i like the bottom end torque of a stroker and run @ 10.5;1. w/alum. heads/solid roller... just not sure which gear will go through at about 6800 with a 10.5x30 tire...patriot heads will flow well at that rpm...a mezier water pump will keep things cool...

[Bill Baer]

Originally Posted by richie 2

thanks everyone...i like the bottom end torque of a stroker and run @ 10.5;1. w/alum. heads/solid roller... just not sure which gear will go through at about 6800 with a 10.5x30 tire...patriot heads will flow well at that rpm...a mezier water pump will keep things cool...

Try this:
RPM, Gears, Tire, MPH
(Engine Inputs):
RPM : Rear End Ratio : Tire Circumference (Results):
Engine Revolutions Per minute minus converter slip, divided by
gear ratio XTire Circumference in Feet =Car Speed in car speed Feet Per minute. devided by 5280 (ft/mile) = car speed in miles per minute X 60 =
Car Speed in Miles Per Hour

Example 6800X.95* / 4.30 = 1502 RPM axel/tire
(* assumes 5% converter slippage)

(30" tire diameter X pi. (3.1416) = 94" circumfrence /12 =7.85ft.circumfrence)

1502 X 7.85 = 11793.2 ft/per minute / 5280= 2.2336 miles per minute X 60 = 134 Miles per hour (MPH)

Again the assumes 5% converter slip they usually slip between 4-8%
Hope this helps.