markandr

I have searched and read ALL of the 402/403 threads and no one's combination of hardware and personal requirements exactly match mine, so I will ask everyone for their opinion. (I have gotten recommendations from Patrick G and Predator-Z directly). I plan to speak with Tony Mamo on Monday. I will then try to average out all the responses and make a final decision.

My requirements are for a nice, strong daily driver. No racing of any kind. I want an 800 rpm idle, perfect off-idle response, and the ability to pull cleanly from 1000rpm in sixth gear. Needs to be able to slog along in stop and roll traffic for days on end. I am willing to leave power on the table for good manners, so please be conservative with your recommendations.

403 short block from Lingenfelter, with GT-11 cam (215/231/118 lsa). Much too small for a 403 in my opinion, but it is what they recommended.
10.5:1 compression. I didn't want gas problems, and tried to leave a little room for a Maggie if I ever win the lottery.
Ported stage 2 243 heads from Patriot (2.02/1.57 - 305 cfm intake/227 cfm exhaust @.600) 64cc chambers.
Stock LS-6 intake
Stock LS-1 throttle body (78mm?)
T-56 with 3.73 rear gear. I'll guess 3500 pound car.
1.75" headers, 2.5" exhaust
LS-7 clutch

Currently at 405rwhp/415rwtq. I am certain there is more to be had while keeping the street manners that I desire.

Thanks in advance for your recommendations.

Mark

Old SStroker

No offense, but your "average out all the responses" is a recipe for disaster IMO. Well, if they all recommend the same cam within a few degrees ( ) that might be a safe approach. If it works anyone can take credit, if it doesn't, noone needs to take the blame...except you.

FWIW, I am always surprised that folks who supply ported heads don't offer the best cams to go with their heads and various engine combos. They should know how their heads make power on dynos, not just their flowbench numbers. Some folks only sell a package of heads and the appropriate cam for the application.

As you have found in your searching, there are 402 combos that drive just as you want but make another hundred ponies and 75-80 more max torque than what you have. The head/manifold/cam/tune are responsible, of course, and would be expensive for you to duplicate.

I suggest you look farther than you have or at the very least pick one cam guy and go with his recommendation.

Jon

Reboot

iTrader: (5)

ditch the LS6 intake and throttle body and go with a ported fast 92/92 combo. This won't affect driveability and should wake it up nicely. You will get way more power out of this mod than changing the cam if driveability is your primary concern.

A 232/236 114+2 is what I ran in my old 383. It made 489 rwhp and had pretty good street manners.

markandr

I'd like to keep the LS6 intake for budgetary reasons. When you say "good street manners" - do you think it would have met all of my requirements listed here?

Reboot

iTrader: (5)

If you have a good local tuner it should meet all of your needs. Keep in mind that your engine is just a big air pump. Your LS6 intake and 78MM TB is a huge restriction that you are trying to overcome with a larger cam.

markandr

I'm not trying to overcome the intake and throttle body with a cam, I am trying to find a cam that will work with what I have. I have an excellent local tuner.

Garrett114

iTrader: (2)

Try something from RaginRacin.com talk to shawn. I wanted the same thing out of my app and it worked great. He has done many apps like you are wanting

2000_SS

iTrader: (24)

232/238 .600/.615 113+2


....but i don't know anything about cams

markandr

232/238 .600/.615 113+2


....but i don't know anything about cams

So - if you don't know anything about cams why are you making a suggestion?

Or - do you know something about cams? What are your credentials?

2000_SS

iTrader: (24)

i know something, admittedly not enough to spec cams for a living. you're asking a forum of your peers, who are, at best, complete and uneducated strangers. i admire your enthusiasm for seeking knowledge and the ideal 'brain' for your engine, but you won't find the correct answer by taking a strangers advice, or like Old SStroker said, averaging those stranger's advice. PatG and Predator-Z are probably the two most knowledgable people on this forum when it comes to understanding valve events, which is what you need to be concerned with.

Pay Patrick G his cam fee and be done with it, do it once, do it right. if you had a cookie-cutter engine in your car, you could safely copy an existing cam posted on here, but since you have a unique setup with unique intentions, you need professional help, not people like me pulling random cam specs out of thin air. what i said may have been spot on, but i'm guessing way off. either way, there is now something to discuss.

Tom@SpeedInc

iTrader: (5)

XER lobes 238/244 .605/.615 112º+2º

speed inc. SS1 cam

http://www.speedinc.com/cont.cfm?cid=C0000150