421/434 RPM Range
 

What kind of RPM to you bigger small block guys run?

Re: 421/434 RPM Range
 

Not enough...hahaha
you have email

Re: 421/434 RPM Range
 

Aw,,Bob,,,,, I was hoping you'd answer him on this. I've been kicking around the idea of doing one of these engines for a while, but am hesitant because I have 4:88s (Dana 60) and a 29 1/2 tall tire and worry that I would spin it too tight on the top end. Just curious I guess,, oh well, thanks anyway.
Danny Durham

Re: 421/434 RPM Range
 

I run a 434 and shift at 6800 and go thru at 7000 to 7100.

Re: 421/434 RPM Range
 

I Run a 434 in a 3000# car with a 350 turbo trans and a 430 rear gear and I shift at 6800 and go threw at 6800

Re: 421/434 RPM Range
 

I'm guessing your running a glide, what rear gear ,how tall of a tire and your MPH. I'm wondering if my converter is going south...............

Re: 421/434 RPM Range
 

Bob,I run a glide with a 4.71 gear 14-32 tire.On the stop 134-135MPH.I only made one run off the stop and it went 140MPH.

Re: 421/434 RPM Range
 

Not counting last year ,,,,, I've ran a small block for Quite a while .

I ran 5.00 gears , 1.92 1st gear in the trans , left on the converter every pass @ 5800 RPM and went through
at 7600/7700 ,,,, in super gas Trim the car weighed 2240 and would run 9.900 @ 148/151 depending on air .

It was a 421 with Dart 23 degree heads .

I ran good parts rebuilt engine ( rings, bearings , head gaskets etc... ) every 200 runs !


Colorful racer # 37

Re: 421/434 RPM Range
 

My 434 in S/St trim 2830 lbs runs 10.90@149-151 depending on the air. Motor turns 7600 with 14.5x 32 and 4.57 gear. Motor makes 830@7400 w/ 676 ft/lbs torque @ 5800. When I first built this motor I ran 4.86 gear and 8" convertor in S/G trim (2600lbs) and went thru @ 8000. I now use 9" conv with the 4.57 gear.