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Hello so I have a 2005 Silverado Offroad Prerunner it is on 37 inch tires. has a fully fabbed ford 9 inch rear end and turbo 400 manual valve body transmission. It had a stock 5.3 with bolt ons and tune. It did pretty good and got me to point A and B until blew up. I am new to LS1 TECH and even tho I don't have a car application maybe you guys can help me with the engine build part.
Im building a:
LQ4 6.0 block
stock LS3 heads that were polished a little and a (3 degree valve job) [don't really know what that means but pair of heads were 750 bucks]
Lunati 408 Stroker kit
11:1 compression Ratio
Lunati Crank
4.030 Bore
4.00 Stroke
6.125 Rod Length
H Beam Rods
Flat Top Pistons
Ls3 Rockers
L92 intake
stock 40bls Injectors
stock Ls3 intake with x link
The shop that doing all the machine work said to go with the comp cam (54-47-11) which is 235/251 .061/.0624 113LSA which I know is a huge cam. they said that I would get really good numbers. but then again they build 1/4 mile cars all day.
im looking or good torque. mid to high power range since my truck needs will never see 90mph plus in the desert.
My question is will that cam fit with the pistons in the lunait kit?
should I be ok with that cam and see what happens?
also LS7 lifters or GM performance lifters PN#(88958689)?
..........The shop that doing all the machine work said to go with the comp cam (54-47-11) which is 235/251 .061/.0624 113LSA which I know is a huge cam.
they said that I would get really good numbers. but then again they build 1/4 mile cars all day.
im looking or good torque. mid to high power range since my truck needs will never see 90mph plus in the desert......
That cam is a pretty good match to the engine, but it may make for an engine that's not such a great match for your truck. So my questions are:
1. What are you using the truck for (Drag Racing? Road Racing? Desert Racing? Daily Driver?)
2. What are the performance points that YOU want from the truck? Like you implied, shops tend to focus too much on drag racing potential and top end power while ignoring other power parameters.
3. How much will the truck weigh?
4. We got the tire diameter....but what about axle gears and torque converter stall?
Also....probably a three angle valve job versus a three degree valve job .
That cam is a pretty good match to the engine, but it may make for an engine that's not such a great match for your truck. So my questions are:
1. What are you using the truck for (Drag Racing? Road Racing? Desert Racing? Daily Driver?)
2. What are the performance points that YOU want from the truck? Like you implied, shops tend to focus too much on drag racing potential and top end power while ignoring other power parameters.
3. How much will the truck weigh?
4. We got the tire diameter....but what about axle gears and torque converter stall?
Also....probably a three angle valve job versus a three degree valve job .
KW
It's a 50% desert toy and 50% daily driver
I want the truck to have good torque and low end power for deep sand and shoot up hills. I would like a mid power band range around 3200-4200 bc when I'm in 3rd gear mid throttle in desert the trucks like to hang around 65-70 mpg.
Truck weighs about 5900-6000bls
Rear axle is a ford 9 inch with 35 spline Detroit locker. With a 2500 stall converter
And thank you for clearing up the 3 angle valve job. I knew it was something like that. Lol
My advice would be to have Kip @ CAMMOTION spec a cam for
You. The cam the shop is recommending is WAY TO BIG
IMHO and more appropriate for a 3500 Lb CAR spinning
6500 RPM and Not a good match for your weight, goals,
And application. I would think intake duration. Of 227*-231*
would be the sweet spot with at least 8* and no more than
12* added to the exhaust. 227/235 on the small side to
231/243 on the large side. Just my .02 and worth what you
Paid for it lol.
LS3 with the LSA Cam, AKA LS376-525.
226/236 .525 .525 LSA110.
It has a very nice flat torque curve.
TH400, Menkens 1:1 Vdrive, Full floater 9" with 4.86 Moser(spool).
33.5" tires. truck weights 2850lbs wet.
it does 100-110mph in the sand.
please dont mind the ford in the background, my boss doesn't want to give me a gm.
I ran a 230/244/114lsa on my 408 lq9 silverado with prc l92/ls3 heads.. they specd this one out for me to get my turd off the line.. has good low end torqye and awsome midrange
......The cam the shop is recommending is WAY TO BIG IMHO and more appropriate for a 3500 Lb CAR spinning 6500 RPM and Not a good match for your weight, goals, And application.......
Agreed! Exactly what I was getting at!
Originally Posted by KW Baraka
That cam is a pretty good match to the engine, but it may make for an engine that's not such a great match for your truck......shops tend to focus too much on drag racing potential and top end power while ignoring other power parameters.......
A smaller cam is definitely in order. Maybe even smaller than the cams previously mentioned.
I concur with the recommendation of contacting CamMotion....not that there's anything special about my recommendation .
A smaller cam is definitely in order. Maybe even smaller than the cams previously mentioned.
I concur with the recommendation of contacting CamMotion....not that there's anything special about my recommendation .
KW
Oooooook so I gave cam motion a call today talked to Bob basically told him specs of the motor big heavy truck big heavy tires 2500 stall etc..... I told him I want good torque very good mid to high power range. It's not a drag truck so I will prob never see 6500+rpm and it need to be reliable for long periods pf time in the power band and for example long dirt stretches in the desert 1-3miles.
Cam motion said to get a custom grind.
224/232 .612/.595 112lsa
I talked to a local ls builder in Arizona told him pretty much the same thing.
He said.
231/242 .630/.615 111+4lsa
Told me that it's gonna be rowdy in the streets. He said keeping the durations low so that the power comes in earlier and make more torque since I have such a big intake head too.....sounds right ?
I ran a 230/244/114lsa on my 408 lq9 silverado with prc l92/ls3 heads.. they specd this one out for me to get my turd off the line.. has good low end torqye and awsome midrange
What dyno numbers were you getting just curious? Bc the cam im looking at is pretty close to yours
The CAMMOTION Cam will be closer to your goals and application
Maybe bump +3* on durations 227*/235* (splitting hairs lol)
lifts are good and LSA 112* +2-3* Advance.
You are getting close, and you are right the intake port is Large
The stroke will eat it up.
01-26-2016, 02:44 AM
Offroad 408stoker Build Help 
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