LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Horsepower differences.. GM847 vs. hotccam

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Old 03-04-2007, 02:16 AM
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Default Horsepower differences.. GM847 vs. hotccam

ok i got a pretty much full bolt-on, port&polsihed headsand intake.... with a hotcam 94 M6. now i was talking to a guy and he said that i might not even pick up much power going from the hotcam to the GM 847 .... i was wondering what some of you guys opinions were...... yes i've tried searching........?
Old 03-04-2007, 08:33 AM
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hotcam is a mild cam and gm 847 is an aggressive cam. people hit 11s with gm 847 cam on ported heads and bolt ons.
Old 03-04-2007, 09:03 AM
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Do you want a car you will continue to enjoy driveing everywhere or do you want one you will endup getting tired of. That is basically what this question comes down too. IMO neither is a good choice, the HOT cam would be servicable but the 847 on a stock shortblock is foolish.
Old 03-04-2007, 12:47 PM
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the hot cam is a waste of money IMO. its just as hard to put a hot cam in the car as it is a properly sized cam but the hot cam yields what, 20-30rwhp max? thats not even worth the time and effect to me.
Old 03-05-2007, 11:35 PM
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well my motor has all forged internals..... with ported heads and bolt-ons.... but i dont wanna spend money on the 847 if i'm not gonna really see a big improvement over the hotcam i already have....
Old 03-05-2007, 11:40 PM
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Why not go to something like a Comp 503 or a custom gring from Bauer?
Old 03-05-2007, 11:47 PM
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Originally Posted by FbodyFreak
well my motor has all forged internals..... with ported heads and bolt-ons.... but i dont wanna spend money on the 847 if i'm not gonna really see a big improvement over the hotcam i already have....
Dude, the 847 will turn it into a racecar if it isn't already. Its a big cam and will not perform as well in the lower RPM range around town. Unless you plan on driving around in low gear spinning 3500+ all the time.. (IMHO)
Old 03-06-2007, 04:35 AM
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Default 847

well I get 22mpg highway with mine, and 15 normal getting on to it. I dont have any problems driving it everyday. With lockup or a 6 speed cruising around isn't bad at all. Its really fun to drive and turns every head. with the 847 and just ported heads on my old setup. I ran 108 through the 1/4 and I switched to the 383 with the same topend and now run 114 but better times and speeds to come, I'm doing alot of things now that I didn't have the money for when I started. The only problem You'll have is if you have a lead foot like me and run around shifting at 7000+ all the time you'll do what I did and spin all the bearings out, but if you keep it below 6500 you'll do fine.
Old 03-06-2007, 06:14 AM
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if you are willing to go big, and wanting an off the shlef cam, get the CC306.
Old 03-06-2007, 06:22 AM
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Originally Posted by hyperzone
Dude, the 847 will turn it into a racecar if it isn't already. Its a big cam and will not perform as well in the lower RPM range around town. Unless you plan on driving around in low gear spinning 3500+ all the time.. (IMHO)
have you ever driven one? its actually not bad once its tuned nice. i guess it all comes down to what you want though.
Old 03-06-2007, 06:59 AM
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yea w/ a proper tune it wasn't as bad as i thought it was honestly... lil surge but not much more than a hotcam...
Old 03-06-2007, 07:32 AM
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Its funny nobody answered this guys question. The question was does the 847 make a considerable difference in horsepower over the hotcam. He never said anything about driving it every day or streetability or anything like that.
Old 03-06-2007, 08:44 AM
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I would do some more research on differant cams. If I was going to the trouble to put a cam in I would want one with the most gains and best drivability.
Old 03-06-2007, 09:25 AM
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Originally Posted by wkniffin98ss
Its funny nobody answered this guys question. The question was does the 847 make a considerable difference in horsepower over the hotcam. He never said anything about driving it every day or streetability or anything like that.
OH yea.. funny how we get so off topic.. Yes it will make more power than a hotcam.. approx 20-30whp diff on most bolt on car's from what i have seen...
Old 03-06-2007, 04:17 PM
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Originally Posted by bowtieman_racin
well I get 22mpg highway with mine, and 15 normal getting on to it. I dont have any problems driving it everyday. With lockup or a 6 speed cruising around isn't bad at all. Its really fun to drive and turns every head. with the 847 and just ported heads on my old setup. I ran 108 through the 1/4 and I switched to the 383 with the same topend and now run 114 but better times and speeds to come, I'm doing alot of things now that I didn't have the money for when I started. The only problem You'll have is if you have a lead foot like me and run around shifting at 7000+ all the time you'll do what I did and spin all the bearings out, but if you keep it below 6500 you'll do fine.


well it will be my daily driver also.... MPG doesn't really come into play with me though..... i really just wanna be able to take or hang with all the cammed LS1's around here where i live.....
Old 03-06-2007, 06:17 PM
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Originally Posted by bearcat
have you ever driven one? its actually not bad once its tuned nice. i guess it all comes down to what you want though.
No, I haven't driven one, only seen them perform... Sorry, I was applying my biased opinions here again I guess.. hard to hold back sometimes.
Old 03-06-2007, 09:02 PM
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Originally Posted by wkniffin98ss
Its funny nobody answered this guys question. The question was does the 847 make a considerable difference in horsepower over the hotcam. He never said anything about driving it every day or streetability or anything like that.

Often people ask the wrong question and it is much MORE HELPFUL to steer them at the right question.

I know a couple locals who went with 230 intake and in the end they enjoyed the cars less.

Don't let people talk you into too big a cam. MUCH better to error on the milder side and be left wanting more but still enjoy the car. I hate to see guys make cars too aggressive and then not enjoy the car anymore. Makes it hard to maintain interest so you can get it right.
Old 03-06-2007, 11:31 PM
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Default 847

Originally Posted by FbodyFreak
well it will be my daily driver also.... MPG doesn't really come into play with me though..... i really just wanna be able to take or hang with all the cammed LS1's around here where i live.....
well mpg is just a ++ if you can get it tuned good and still get good mileage. I think most cam only ls1 cars pull in the 12's. But remember their heads stock are probably equal to our heads ported so they've got a big advantage so running a little bigger cams in our cars to keep up with them is a necessity. I think you'll gain .3-.5 tenths with the right tuning just by swaping cams, with everything supporting mod wise and perfect tuning maybe more. some guys pull 11.9 to 12.2 with an 847 and stock heads, but those guys have good tuners I still got a base tune from madz28 so I have a lot more power to be had from my car. I've heard the 847 loves nitrous so you hook good and drive good you could see anywhere from high tens to 11.3 on spray without any problems. But I've learned the hard way on performance some things that you dont think amount to anything power wise will surprise you. valve adjustment, timing, etc. these things can net you .5 through the 1/4 going from not being right to as close to perfect as you can get. I've learned alot from lloyd elliott, and some other guys on the site.
Old 03-06-2007, 11:58 PM
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just put the 847 in my car with le2 heads and a 2800 stall. i dont know why people say the 847 couldnt be daily driven. so far ive had no problems with idle surge, bucking around town or nothing! u will notice that the cam doesnt start to pull until after 3000 rpms, but once it starts to, say goodbye, because it pulls hard!
Old 03-07-2007, 03:41 AM
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i to have been thinking of a cam. i'm gonna do a rebuild but i'm not sure if i should just turn it to a 355 and put a descent streetable cam or just leave it the 350 and do all heavy duty **** for the rebuild. Put a Hotcam in and maybe keep stock heads. I just want it to be faster then the average bolt on LS1. I don't care about killing all when they line up with me. I'd like it to not have much of an agressive idle but really notice a mid to upper RPM pull. ~Cole~


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