trans9_5am

To everyone,

I recently purchased some new parts for my next engine build-up and i want to know your professional opinnions on the combination i plan to run. I know there is a few guys out there running some big head/cam kits in there lt1's with stock bottom ends and some even still drive on a daily basis. Some parts were purchased through Cmotors. Here are a list of parts:

- Combination Motorsports Stage II heads (I cant say how much are they flow because im not allowed to, but its HIGH)
- CC 236/242 @ .608/.576 (custom grind to match the heads)
- tripple valve springs that wont bind till .640 lift
- Comp "R" lifters
- Comp 1.6 RR 7/16 studs
- chromoly 1 piece pushrods, ti retainers, guide plates, etc.
- Accel 36 Lb/hr injectors
- Accel Adjustable Fuel Press Reg
- Walboro 255 L/hr fuel pump
- Jet-Hot LT's
- No Cat(well really gutted cat) with Very Free Flowing Exhaust (Probably true duals with x-pipe and maybe flowmaster 10 series muffler's???? havent totally decided on exhaust yet!!)
- MSD 6AL Ignition with Blaster coil
- Accel 300+ Race Wires
- NGK V-power plugs
- 58mm Holley TB
- CAI
- P&P MAF
- Highly P&P Intake (not sure where to get done yet but know a few good names)
- Lt4 Extreme Duty Timing Chain and Gears
- Meziere Elec. WP
- 3.73's
- A4 built to hold 650 ft-lbs with 3200 Vig
- Suspension Mods and Nitto Drag Radial on rear
- EXTENSIVE PCM and Dyno Tuning

I plan on gaining some big HP numbers with this set-up but i just want to know what everyone has to say about the risk im taking first. I cant wait to see what this cam would shound like in my car either

Thanks
Brandon

Valkyn71

Id say you should be fine with that setup, the one thing i see if your going to be getting close to bind on those springs with 1.6rrs i believe?


not sure on the exact formula and how close you want to run springs to bind.

neil350

Once its tunned it'll be fine, prolly idle similar to a 847 or a CC306, just all in the tune. Its a big cam in an auto so its going to drink some gas. Far as stall the 3200 Vigi is what I have and its 100% streetable. Your car is going to be loud as hell with duals and LTs, if your willing to put up with the noise then yea it's fine. People dont do h/c for gas mileage any way.

SS MPSTR

LOL, I find it amusing that you cannot disclose head flow, but you've disclosed many numbers of your 'custom' cam.

....from what you've disclosed, that appears to be a big cam in a 350.

LT4POWR

I'm not sure if it helps, but my CC EX 236/242 (lift 555/576, 33xx lobes) on a 112 lsa is very driveable. To me that sure looks like alot of lift, but I'd trust Combo's professional opinion.

disco192

I couldnt find that cam on CMotorsports page, but they rate most of thier cams with 1.6 rockers.

My main concern would be the lifters. Im not really sure that Comp-Rs can handle tripple springs at 6500+ rpm with ramp rates that steep.

RamAir95TA

I'm running the exact same cam, and I must say that it has more drivability than I had originally thought.

LT1Squirrel

you forgot to list the mods you did to the rear end

trans9_5am

I'm sorry they are 1.6rr's. Does anyone know what the formula is to figure out if my springs will bind or not? If not does anyone know of someone running this similar set-up that has proof these springs will be ok for the job. I might just call up CM to find out what they say, afterall i believe they did come from there.

And about not telling the flow numbers for the heads, the guy before me promised not to tell so i guess i have to do the same, i dont want CM to get mad at me for something like that (not saying they would or anything.

Yes it is a big cam in a 350, that is the whole point. people are running even bigger cams than that. thanks for all the info so far though guys.

LT1Squirrel,

SS MPSTR

I understand the whole 'secrecy' thing well. Just doesn't make a lot of sense about the headflow....why wouldn't Seth or other head guru's want others to know what kind of headflow they managed on a particular head or why it should be kept a secret? Seems like it would be good for business? That's like keeping your ET a secret.

SAR2K

You'll be fine with that cam on a stock bottomend.
Steve...

Spinner

Check your piston to valve clearance. That's a BIG lift on a stock setup, shouldnt be an issue on a 112 LSA, but if your on a 111 or a 110, i'd definetly check the clearance. Would suck to lose a motor because of inadequete clearance.

As far as springs, your going to want at least a beefy double. Some comp 977s with Ti retainers would be ideal

trans9_5am

What is the piston to valve clearance i should shoot for?

Any guesses on RWHP with all the mods i mentioned?

trans9_5am

Steve,

What kind of combination are you running on your stock bottom end monster?

Spinner

He;s running a 242/252 monster... not sure on lift specs