cam questions
Thread Starter
Staging Lane
Joined: Feb 2005
Posts: 87
Likes: 0
cam questions well i dont have the money to do heads but i want a cam in my car soon. I searched around and did not find a deffent awnser on what would be the best cam for my car. on another site some guys were saying that if i did a gm847 and did not spin it to 7500 i would slow me down, which i do not want to happen. Some people have said do you 503 or the 306. I dont know what one to do so if you guys could help me out with this one i would appreciate it greatly.
I have the 503 and like it a lot. It gave me a good power markup without a lot of driveability loss IMO. I am in the process getting my hands on some 1.6 rockers for my ride at the moment to increase the lift.
The idle is not to crazy, but you cant mistake that i have a cam.
It depends if this a daily driver and how much you wanna spend on gas.
Dont forget your going to have to upgrade your springs as well.
Do you have gears and other boltons? That is also important with these two cams.
The idle is not to crazy, but you cant mistake that i have a cam.
It depends if this a daily driver and how much you wanna spend on gas.
Dont forget your going to have to upgrade your springs as well.
Do you have gears and other boltons? That is also important with these two cams.
Thread Starter
Staging Lane
Joined: Feb 2005
Posts: 87
Likes: 0
i dont drive it daily and i dont care about gas milage but i dont want like 10 mph or nothin. I dont have gears just the stock 342 but i will be getting 373's soon. What does your car run at the track? Did the car take alot away for your bottem end and put enough up top? Did you have to get hardened push rods? I know i will need springs, and how have you not blow your 410's apart? Enery one i know that tried them in a fbody did not make it 2 passes down the track
Originally Posted by 96ramair
if i did a gm847 and did not spin it to 7500 i would slow me down, which i do not want to happen.
Originally Posted by 96ramair
i dont drive it daily and i dont care about gas milage but i dont want like 10 mph or nothin. I dont have gears just the stock 342 but i will be getting 373's soon. What does your car run at the track? Did the car take alot away for your bottem end and put enough up top? Did you have to get hardened push rods? I know i will need springs, and how have you not blow your 410's apart? Enery one i know that tried them in a fbody did not make it 2 passes down the track
I put hardened push rods in since i was already in the motor.
The cam didnt take too much from the bottom. powerband on it is around 1900 + i think , to like 6800
The way i have not blown my 4:10's is taking it easy on my launches and not using slicks. Of course i would love to just let it rip and have some slicks hold me , but that is outta the question with a 10 bolt on my M6.
When i launch i just get a chirp out of it.
About the whole 7500 rpm thing , that is not something you want to do at least continually , untill you rebuild your bottom & valvetrain for that.
I have had mine to 7k before however.
Yea, the stock PCM is only good to 7000rpm. Going past that is like entering the twighlight zone. 
The GM847 is a proven performer with stock heads and if you dont have a problem revving your motor to 6500rpm, Id say go for it. If youve got reservations about revving your motor past at least 6k, save the money for the cam all together and and buy a rebuild kit first. Just make sure you get the supporting mods such as the valvesprings, hardened pushrods, and timing chain and you should be good to go. 1.6's rockers wont hurt either.
The GM847 is a proven performer with stock heads and if you dont have a problem revving your motor to 6500rpm, Id say go for it. If youve got reservations about revving your motor past at least 6k, save the money for the cam all together and and buy a rebuild kit first. Just make sure you get the supporting mods such as the valvesprings, hardened pushrods, and timing chain and you should be good to go. 1.6's rockers wont hurt either. Trending Topics
Thread Starter
Staging Lane
Joined: Feb 2005
Posts: 87
Likes: 0
so with all this being said should i do the 305,306, or the gm847. Maniley I want to have better big end with out killing my bottom end. I figure with a cam i will have to spin 6500 so no big deal, i just dont want to put a cam in and be slower. let me know what you think. I would like to hit high 12's with a cam and a tune.
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Originally Posted by 96ramair
so with all this being said should i do the 305,306, or the gm847. Maniley I want to have better big end with out killing my bottom end. I figure with a cam i will have to spin 6500 so no big deal, i just dont want to put a cam in and be slower. let me know what you think. I would like to hit high 12's with a cam and a tune.
As for slowing you down, well everyone has a story or experience or knows someone, yada yada yada, but I put together my own 847 combo for a pig of a car @3,600lbs on the scale with a gm 12 bolt I was hitting 12.5 to 12.6 consistent at HRP in Baytown, TX. It dynoed 375@GForce in Houston, torque was around 360ish. A few that know me here can contest it was an excellent choice of cams for a stock cubed engine, stock heads and all the boltons imaginable. I only spun mine up to 63k rpm just because I was conservative with CompR lifters and stock block. I never got to run at the track with the 2wk old AFR-210s, spun a bearing on the old block but I'm confident she would have been around 12.1 to 12.3 maybe with ETs.
Tuning is the key for any cam, and the 847 like the 306, etc etc will shine with good tuning, neither of these cams are going to slow you down, the 847 is advertises a mid to high range power curve (and delivers) but with everything else setup to match the torque @low rpm was incredible off the line.
Hope this helps a little.
Staging Lane
Joined: Jan 2005
Posts: 98
Likes: 0
From: Orlando (UCF), Florida
What about the 230/236? I have it and love it. It is excellent for daily driving (good tune is a must for this though), even during the 2 months I had 3.23 gears (because of A4->M6 conversion). It pulls to about 62-6300. IMO, it's a great cam for stock heads, and when/if you get ported heads it will waken up even more.
Ryan
Ryan