I've thought that I change a bit my engine setup...
How much should I expect power with this kind on setup, from the engine:
Ported LT1 heads, flow 520hp
comp cams 467 cam
hedman longtube headers
30lb/hr injectors
Intake ported and matched to heads
MSD 6al
52x2 TB

 

What?

I'm going to guess ~375 rwhp.

 

I ran a similar set up with a 466 and got 360 rwhp. A 467 would get about 20 more. On an AT that's approx 440 at the fly more or less.

 

The XFI stuff is GROSSLY overrated, the rpm ranges published are drastically lower than reality and if you use the recommended springs you WILL have valvetrain control issues maybe not immediately but it will happen too soon.

Lots of things play into the rpm range of a cam BUT a properly spec'd cam of less duration with the right valvetrain should let you use all the pcm's capability and more than should be done on a stock shortblock rpm wise.

 

I have crane 99846-16 valve spring set in the engine

 

That spring wont even come close to controling that cam, doubt it would control even the samller XFI lobes.

I am NOT saying it is a bad spring, just saying it is not appropriate for these lobes.

Realitically I think you should have a longer valve to give you the option of running more spring.

 

Ok, so what springs you suggest?
And what do you mean that it wont control it?

 

The XFI lobes were designed specifically with the beehive springs in mind, BUT the 918 beehive Comp recommends will give up after far too short a time period because Comp's rpm range is much lower than reality. The extra RPM will be more demanding and wear them out..

By "wont control it" I mean the lifter will get thrown off the nose of the lobe and the valve will bounce off the seat when it closes, both conditions are called "valve float" some classes of racing use the throwing the lifter off the nose of the cam to increase effective lift without having a high lift cam, BUT it is hard on parts, bouncing the valve off the seat hurts power because a valve is open when it should be closed.

I really could not tell you what spring you should use, going to depend on your valves weight/length and just how high in rpms you need to take that cam with the rest of your setup.

 

Beehive springs, retainers, locks and id/od locators ordered...

 

To use with what cam? You were given some solid advice by 96capricemgr, and I hope you took it seriously.

 

Comp 467

 

i had the simalar setup in my iroc when i first go it

355 lt1 (stock bored .030)
Ported heads
Ported and rasied runner intake
52mm tb
30# accels
Hot cam kit
1 5/8 shorties


I put down 315/315 RWHP thru a 4l60e 3000stall

Jay

 

Which springs did you order?

 

Comp 26918-16