how many of you have upgraded the cam (without boring or stroking) to something more radical than the GMPP hotcam? what did you go with? what kind of power did it give you? I am thinking of going with this cam
http://forums.corvetteforum.com/showthread.php?t=901626
I am curious if anyone else here has used a cam this big before besides him. if so what kind of power did you put out? if you used another cam what kind of power did you put out and what other mods did you have? I am in the middle of planning a cam swap and a couple other things for my car and am trying to decide what to do

 

CompCam 503......almost 370rwhp with poor A/F and factory exhaust manifolds...

EM long tubes are in the basement.....should be on car soon...

http://www.compcams.com/Technical/Se...umber=07-503-8

lifts are shown with 1.5 rockers.....I used 1.6 of course..

 

370 huh? thats extremely impressive! do you have a dyno sheet i could look at? im curious how the powerband compares with the other one. what other mods do you have? are you happy with it? you have my intrest please give me more details

 

head work, intake ports matched to ...777gasket, 58mm throttle body with intake openings matched, electric water pump,

plus rocker arms/springs/push rods/double roller timing chain/felpro head gasket/

power peak is at about 6450.....

ALMOST 370....between 365...369

 

Nice ##'s!!! I'll be doing similar mods here soon... but I think I'm going with the Hotcam.

 

Well there are some other things to take into consideration such as do you have to pass smog, how rough an idle can you deal with, can you live with a little cam surge? If you are not sure the answers to these questions than a good recipe for success would be Longtube headers, 4.10 gears, and a Hotcam with programming.

 

The cam you are looking at makes less HP across the board untill 5300 RPM and no noticible increase in TQ untill 4500 RPM's. If you are just looking for peak #s then it may work fine. The 503 is a little bigger cam then the HC and has split duration on the same LS and should make exelent power across the board with a good flowing exhaust and a tune. .

 

I will try and answer everybodys questions here.
I do not have to pass smog or any other type of emiisions testing.
I can deal with quite a rough idle. to be honest I am kind of sad it isnt more rough from the factory.
You need to fully explain to me what cam surge is in order for me to answer. I think it is when the cam is kind of choppy at idle then surges up a bit then starts to die back down like a heavily built old muscle car will do. Am i right? if so no i dont mind that.
I do want long tube headers but i really dont want a 410 gear at least not at this point.
i Want something a little bit stronger than the hotcam. most guys with the hotcam and headers are running around 350rwhp if they are doing good. I would really like to make around 400rwhp. I dont care that the cam im looking at is actually weaker untill higher RPMs because i only drive the car puttering around town in which case i already have quite enough bottom end torque for city driving and losing a few ponys down low will be quite alright with me becausei am more intrested in top end power.I want around 400rwhp for the times that i go to the drag strip. 90% of the time you arent below 4600rpms anyway. So this looks like a good sacrifice to me.

Anybody else have a LT4 with a aggresive cam? please let me know what you have and what you put out

 

You will need the 4.10 gears because of the bottom end you will lose with a large cam. Is your car stock? If so a good combo would be Longtube Headers, 4.10 Gears, GM847 Cam, and programming.

 

please tell me more about this GM847 cam. is it as aggresive as the dragon cam i posted earlier? do you have any dyno sheets of it? im curious what the powerband looks like. i understand that a large cam will lose bottom end but from what i saw on boulderlt4s dyno it only looked like about 10-15rwhp at bottom end he lost. not a whole lot and didnt seem to me to be enough of a loss to warrant a much higher rear gear

 

I know nothing about the dragon cam. The 847 is the most aggresive cam GM sells. Part # 12370847 will make power from 3500 to 6500RPM and make 400rwhp on a LT1 car with ported heads. You will have similar results.

 

hmmm
definatly worth looking into
the specs on the dragon cam are
570/575 Valve Life
286/294 Duration
but i will have to take this and the specs on th GM 847 cam to my engine builder and see what he thinks

 

The 847 is not for the faint at heart. A buddy of mine uses it, when we pulled in for a smog test all the grass died, a bird fell out of the sky dead, and the smog technician passed out from the fumes. The manager told him he failed and we were asked to leave.

 

HAHAHA AWESOME! that is exactly what i wanted to hear!
ROTFL

 

Here are the specs:http://www.sdpc2000.com/cart.asp?act...d=989&pid=1849

 

it says not for use with fuel injected computer controlled engines..... is that just to get them off the hook for it being so aggresive? was ur buddys on a LTx vett?

 

12371042
you need those lifters though!

hmm man I might have to sell my hot cam kit!



what do you think?
I have a 1996 lt1 soon to have LT4 stg 3 ported heads and intake to match. I have stock rear...dana 36 2.59s
I was gonna sell the springs anyways cuz Im gettin the LS1 beehives for free.

Should I sell the Hot cam, springs, and retainers... and keep the RRs
(keep in mind I got the kit brand new for 325 shipped) and go to a large cam?

I want to go as fast as I can and get as much HP as possible!
I will get a tune after and also dont have to worry about emmissions!

thanks alot your friend
Sean

 

Then sell everything including the lifters and R/R's and go with a SR cam, Guideplates and non SA R/R's

 

well what Cam
thats my biggest prob is what cam

 

i think i have made up my mind to get the dragon cam. i cant argue with what good numbers boulder lt4 got and if im lucky i can replicate that pretty easy