Shift point for a 422 cam?

[crashing_sux]

I'm running a 422 with headers, Vortec's, ported intake and a T-68 (hope that's enough info). What are most people with similar setups shifting at, and does anyone know the weights I would use to achieve it?

I'm thinking somewhere around 5800rpm maybe? My tranny guy said he'd change the shift points free once so if I could get close the first try it'd be nice.

 

[jwaller]

Re: Shift point for a 422 cam?

5800 sounds nice but it more depends on where your truck makes it's power. put it on a dyno and then adjust accordingly. otherwise your just guessing.

 

[crashing_sux]

Re: Shift point for a 422 cam?

When I floor it 5800 feels about where it should shift, I'll dyno it in a month or two and probably have it redone then but my tranny is currently out so I figured no time like the present to get it closer than it was. It'd be nice if I knew what weights/springs to use though, unfortunately I can't find the thread that discussed this previously, I searched for governer and weights thinking that would find it but had no luck. I wonder if the new search is missing things or if there could somehow be a thread on what weights and springs to put in the governer that wouldn't use those terms?

 

[Loeryder]

Re: Shift point for a 422 cam?

I searched for "shift points" and found this gem in less than 10 seconds.

http://www.syty.net/forums/showthread.php?t=12923&highlight=shift+points

Talks about revs weights and all that shit.

I think that ones goin in the vault... 3-2-1

 

[nightdiver]

Re: Shift point for a 422 cam?

I got the governor seted up to 6500 and i feel NO power loss. In fact during my tests i reved up to 7500 and broke a pushrod and a hydro lifter.
Please note that this was with 22 psi and my T78
I think 6000 would be nice.....well if you got the balls to watch the revs climbing

 

[sean]

Re: Shift point for a 422 cam?

where would a good rev point be for a 415?

 

[nightdiver]

Re: Shift point for a 422 cam?

As a rule of a thumb they say "rev it 30% over the cams range, MAXIMUM"
I really cant remember where i read that
So go just 200-300 rpm higher from the cams power band .....to be safe......

 

[crashing_sux]

Re: Shift point for a 422 cam?

I just have no idea what the cam's power range is in our application. Boost would change the range from n/a wouldn't it? Does the range change with the amount of boost? If what limits a cam's upper end is not getting enough air moving through the valves for the given duration/lift and rpm then does adding boost force more air through and extend the range?

I just guessed 5800 as that's about when I start to feel the power fall off, although I'm only running 18lbs of boost so maybe that will go up when I run race gas or Alky?