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Old 03-21-2011, 08:42 PM
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350 csfi vortec build questions

I have a few questions regarding a new power plant for my 96 C2500. Currently the vehicle is an 2WD, L30, 4L60e with 14bolt SF 3.73 with G80. ExCab/SB. I don't want to go too extreme because it's my DD. Just looking for some extra fun.

Currently, I'm thinking of just going with an L31 short block and adding a Lunati 54779 cam , 1 5/8" full length headers with dual 2.5" exhaust and a black bear tune.I really don't want to be making power past 5.5k as the engine will still retain the stock CSFI and computer controls and I'm pretty much limited by these. I'm going to be running 265/60/18 tires with this setup.

Vehicle is hardly ever used for towing anymore. I'm just looking for some straight line performance that's somewhat close to today's sport trucks.

Now for the questions:

Do you think 4.10's would be a wise investment?

How high of a stall should I run?

Do you think this is too small of a cam?

Thanks in advance!

EDIT** figured I'd post my DD2000 results:

RPM | HP | TRQ
2000 162 426
2500 208 437
3000 262 458
3500 306 459
4000 341 447
4500 366 427
5000 325 341
5500 309 295
6000 278 243

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Last edited by Valkyrie5.7; 03-21-2011 at 08:47 PM.
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Old 03-22-2011, 10:12 AM
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anyone?
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Old 03-22-2011, 03:59 PM
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I have a 1996 k2500 and rebuilt the 350 to a 383. The truck is 7400 lbs. 4l80 trans 14 boltff with 4.10 gears and is a blast to drive. The csfi injection can support up to 430-450 horse when properly tuned! You may want to look into a ht 383 GM crate motor. Direct bolt in and a factory warranty....what's not to love?

Also check out WWW.fullsizechevy.com good website dedicated to everything Chevy trucks!
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Old 03-22-2011, 04:40 PM
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Quote:
Originally Posted by CJ_1080
I have a 1996 k2500 and rebuilt the 350 to a 383. The truck is 7400 lbs. 4l80 trans 14 boltff with 4.10 gears and is a blast to drive. The csfi injection can support up to 430-450 horse when properly tuned! You may want to look into a ht 383 GM crate motor. Direct bolt in and a factory warranty....what's not to love?

Also check out WWW.fullsizechevy.com good website dedicated to everything Chevy trucks!
Hey thanks for the reply! I was wondering if the fuel system would support 383 cubic inches. I might have to go stroker on this one then
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Old 03-22-2011, 07:52 PM
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My build (while not proven on a dyno) is probably in the ballpark of 340-350 horse but probably 430-440 ft/lbs of torque. I built it for low end torque. I tow quite a bit and plow and haul with my truck and it makes all the above a lot easier! And when my right foot is out of the skinny pedal the gas mileage isn't too much different. Always a plus! Good luck with your build!
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Old 04-21-2011, 02:23 PM
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Thanks, I hope for the best on it. I'm just aiming to drag its heavy carcass into ~mid 14's in the 1/4. I don't think it's an unreasonable or unattainable goal.

My main concern is that I think my cam is just a little off for my build. I think my 9.3:1 SCR is a little low for the cam and my estimated 8.5 DCR seems a little high. I don't know how much it being computer-controlled with fuel injection will compensate for with a tune. I'm not sure how far I can push it or even if I should. I guess I need to do a bit more research on the relationship between scr/dcr and camshafts and go by actual calculated figures instead of my estimations.

Since I haven't really gotten a lot of feedback I'll probably just wait till I know what my figures are exactly and pick a cam after I know what I'm working with. I'm still a little lost in cam selection.
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Old 04-21-2011, 05:55 PM
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The vortec truck is a bit forgiving because of the knock sensor. My 383 has 9.7 scr 8.7 dcr. My quench is .038 and I polished the chambers and unshrouded the valves. I run mine on 87 without problems. I towed a buddie's truck (3/4 ton Ford diesel) home and truck and trailer weighed 8400 lbs. It towed beautifully without any pinging or problems! That cam is right in the ballpark of what I would suggest. To much bigger you would need to upgrade the converter. That cam will work good with the stock converter.

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Old 04-21-2011, 06:27 PM
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I also figure your compression ratio with a stock 5.7 at 9.5 Scr and 8.3 dcr with that cam. That's assuming 64cc heads, 6cc in the piston, .025 down the hole, .041 head gasket, stock bottom end, and the lunatti cam you listed.
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Old 04-21-2011, 06:52 PM
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CJ, you are wise well beyond your years. I wish I had the knowledge at age 26 that you have. Well done.
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Old 04-21-2011, 07:15 PM
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Tech, I had some good teachers (you and bogie) and love to read everything I can get my hands on even if I can't get my head all the way around it!
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Old 04-21-2011, 07:34 PM
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Ah I figured my stock compression at 9.3:1, so that makes sense. I really appreciate you being so helpful. I'm glad to know that I'm only unsure instead of naive when it comes to choosing a cam, haha. Tech inspector is correct, you sir are wise beyond your years.
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Old 04-21-2011, 08:09 PM
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Easy guys, my head may not fit in my truck to go to work in the morning!!
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Old 04-21-2011, 11:44 PM
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Quote:
Originally Posted by CJ_1080
Easy guys, my head may not fit in my truck to go to work in the morning!!
Idk about that, they're pretty spacious cabs
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