I dyno at 375 rwhp with my current setup. Would I see more gains going to an xfi 230/236 .515/.515 (1.6 rr's) or going with an eagle 383 stoker kit? Including labor, the stroker would be double the price.

 

I have this XFI lt1 cam and I am going to go bigger. IMO stroke it and cam it.


XFI" 280 Hydraulic Roller Camshaft
GM LT1 & LT4 350ci 1993-96
Lift: .576"/.570" w/1.6 Rockers
Duration: 280°/288°
RPM Range: 2000-6000
249-07-467-8
Operating Range: 2000-6000 RPM
Duration Advertised: 280° Intake / 288° Exhaust
Duration @ .050'' Lift: 230° Intake / 236° Exhaust
Valve Lift w/1.6 Rockers: .576'' Intake / .570'' Exhaust
Lobe Separation Angle: 113°

 

I've gotten alot of stoke and cam it responses. Unfortunately I don't have the money right now to do both. I'll probably get the cam first,and the stroker later on. I 'm just wondering, for comparisons basis, which would lead to more hp gains.

 

What are the specs on your motor right now? I would imagine the cam swap would yield the better gains, not to mention it is alot cheaper swapping cams then doing machine work on a block and putting in a new rotating assembly.

 

I don't mean to hijack your thread but I just wanted to know how your car ran with your current setup. Those are some pretty good numbers through an automatic.

 

What's the labor cost, at say $75/hr to install the stroker on my stock engine block? car runs great. I like the 3600 stall. Maybe not so great for a dd, but allows for alot of torque down low. The cam is a bit loud for the size. Maybe a little too much bark for the bite, if you get my drift. Good numbers though.

 

Cubic inches is half of the equation and cam and heads is the other half. If you're going to go fast, you've got to have both (the complete package)! I’m running a 396 w/ the largest Comp XFI cam, beehives and I’m in the low 11s @120 MPH (all N/A).

WD

http://www.cardomain.com/ride/2189634

 

i agree with Engineer it is a total package. get a good set of heads that later will work with a stroker set up and a good cam. either way when u get around to doing a bigger motor it is alway a wipe the slate clean and start all over feeling.

 

I have GTP stage 2 heads. Can't find the specs anywhere. Are these heads not good enough for a 383?

 

http://www.malcams.com/legacy/misc/headflow.htm

Intake Exhaust
70.0 51.0
122.0 115.0
186.0 145.0
222.0 176.0
254.0 204.0
266.0 217.0

Look pretty decent to me, definitely not the best though.

 

with the numbers posted no not enough to fill the cyl's and you will suffer

 

Actually mine are the LT4 heads, not the LT1 heads. I see alot of guys running AI heads on a 383. My heads have comperable flow #s on intake and kill AI on exhaust flow. So what am I missing here?

 

Well you should have said that. Every flow bench is the same and flow numbers aren't everything. I think the Stage II LT4 heads should be enough for a 383. See if you can upgrade your valves while they're off too, though.

 

It amazes me how so many people feel they need to totally redesign the LT1 to achieve performance. These engines are extremely popular at the local racetrack (No Problem Raceway), the stock eliminator cars run deep into the 10’s with 3.48” stroke crank and stock LT1 heads.

For a strong running street car, mild ported heads and a custom ground cam to match will produce impressive amounts of power with a totally stock bottom end. The rest is in the tune-up and chassis preparation.

 

Those are PLENTY good to work on a 383. Those are some impressive exhaust ports! Get a custom grind from Brett and go with that. I'm running a set of LPE 192's with a stock intake and if I can get the dang 60 down, I should run in the 10.3X's. My heads flowed slightly better on the intake and slightly lower on the exhaust compared to your heads. For best all around power though, you can't beat a 383. It's an instant 30 - 40 lbs. ft. of torque.