How is the GM847 with stock heads & bottom?
How is the GM847 with stock heads & bottom? as the title states.
Ive been stuck on the 224/230 for the longest time but im afraid it wont be big enough. Is the 847 too wild if i want to shift at 6200? (im not necessarily concerned about not getting the most out of my cam)
How is the torque down low?
Ive been stuck on the 224/230 for the longest time but im afraid it wont be big enough. Is the 847 too wild if i want to shift at 6200? (im not necessarily concerned about not getting the most out of my cam)
How is the torque down low?
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From: Schiller Park (NW burb of Chicago)
a cam like the 847 is jut too big for stock heads. Can you run it, yes. You will see more gains from a smaller cam with stock heads. The 847 needs to breathe just like any other big cam and would like to be spun up to about 6500-6700 RPMs. You wouldn't be getting the full benefits of the cam. Smaller cammed guys on stock heads will most likely outrun you. If the cam can't breathe, your not going to see much out of it.
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From: Schiller Park (NW burb of Chicago)
847 peaks at 6200...
Ive read elsewhere that 1.5 rockers are good on this cam to "tame" it down a little.
sounds like consensus is that i should go with the 224/230 then? ugh... i just dont think its big enough.
Ive read elsewhere that 1.5 rockers are good on this cam to "tame" it down a little.
sounds like consensus is that i should go with the 224/230 then? ugh... i just dont think its big enough.
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Why are you wanting to jump to the 847 just cause you don't think that cam is big enough? There are many other cams in between those sizes that would be more appropriate with stock heads than the 847.
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From: Schiller Park (NW burb of Chicago)
i would suggest getting your heads ported first because that would help even the cc503 i assume thats that cam your speaking of at 224 230 its a great middle of the road cam which will put down some awesome power with ported heads
i think some of the people on this board are putting down over 360 at the wheels with that cam and ported heads
i think some of the people on this board are putting down over 360 at the wheels with that cam and ported heads
I want a cam that im going to enjoy. This car is not my daily driver by any means, it probably gets 2k miles a year or less. Ive driven a handful of cammed LS1s, and so far my favorite cam for that engine is the torquer V3 which i believe is like a 231/234 on a 111. I wish there were some middle of the road cams like that for LT1s.
edit: heads are not going to be ported on this motor, this one is going to stay cam only. Im going to save ported heads for my next engine which wont be built on a college budget.
Well there are actually 2 230/236 cams (the xe and xfi ones from comp) and people have done well with those (over 360rw on stock heads), then there are the 2 AI cams 226/234 and 230/238, there is the comp 233/239 (probably still too big), Lunati has several one 226/234 and a 231/239 I think.
And there is always custom.
And there is always custom.
if you're willing to rev it, gear it, and set it up properly, the GM847 will go faster.
that is atljar's GM847 cam only dyno a few years back. he was running 11.9s @ 115 with a 6 speed.
the cam runs just fine when it is set up properly. don't let anyone discourage you. smaller cams are for daily driving. larger cams are for racing. which one do you want to do?
edit:
http://www.camaroz28.com/forums/showthread.php?t=190876
more info
his website is down but from what I gather:
60: = 1.687
1/4: = 11.98
mph: = 115.44
-1150 DA
Left at 6k+
GM 847 cam, supporting valvetrain
TB is 52mm, stock throttle body, bored over by halbert performance
"Race weight = 3800ish (guessing), not a lightweight by any means. Nothing has been removed (not even jack/spare), plus 10 inch sub, and amp, plus 12 bolt, plus me etc etc."
Its lowered, lower control arms with brackets, and a panhard bar.
Rest of suspension is stone stock
12 bolt rear w/ 4.33s
Tire/wheel combo:
Front: Weld drag lite skinnies, with some VW van tires on them.
Rear: 16 inch 5 star TA wheels, 26x11.5x16 ET streets@ 14psi
http://www.youtube.com/watch?v=zvx-cAvoy4M
that is atljar's GM847 cam only dyno a few years back. he was running 11.9s @ 115 with a 6 speed.
the cam runs just fine when it is set up properly. don't let anyone discourage you. smaller cams are for daily driving. larger cams are for racing. which one do you want to do?
edit:
http://www.camaroz28.com/forums/showthread.php?t=190876
more info
his website is down but from what I gather:
60: = 1.687
1/4: = 11.98
mph: = 115.44
-1150 DA
Left at 6k+
GM 847 cam, supporting valvetrain
TB is 52mm, stock throttle body, bored over by halbert performance
"Race weight = 3800ish (guessing), not a lightweight by any means. Nothing has been removed (not even jack/spare), plus 10 inch sub, and amp, plus 12 bolt, plus me etc etc."
Its lowered, lower control arms with brackets, and a panhard bar.
Rest of suspension is stone stock
12 bolt rear w/ 4.33s
Tire/wheel combo:
Front: Weld drag lite skinnies, with some VW van tires on them.
Rear: 16 inch 5 star TA wheels, 26x11.5x16 ET streets@ 14psi
http://www.youtube.com/watch?v=zvx-cAvoy4M
Last edited by zigroid; Feb 22, 2008 at 01:43 PM.
If you dont want to spin past 6200rpm you will even be hindering yourself with the cc503 even. Either look into some smaller cams or decide if you want to take the risk and spin the short block up higher so you can run a larger cam.
you should read this carefully:
https://ls1tech.com/forums/lt1-lt4-modifications/836200-stock-head-cam-cam-swap-guide.html
you should read this carefully:
https://ls1tech.com/forums/lt1-lt4-modifications/836200-stock-head-cam-cam-swap-guide.html
if you're willing to rev it, gear it, and set it up properly, the GM847 will go faster.
that is atljar's GM847 cam only dyno a few years back. he was running 11.9s @ 115 with a 6 speed.
the cam runs just fine when it is set up properly. don't let anyone discourage you. smaller cams are for daily driving. larger cams are for racing. which one do you want to do?
that is atljar's GM847 cam only dyno a few years back. he was running 11.9s @ 115 with a 6 speed.
the cam runs just fine when it is set up properly. don't let anyone discourage you. smaller cams are for daily driving. larger cams are for racing. which one do you want to do?
or you can go big just in case later down the road you decide on a 383/396 etc or aftermarket heads so you already have a cam that will feed the bigger displacement or heads. the CC306/847 is a good cam. you drive your car as much as i do and im set for the 306 or a custom grind thats .600/.610 lift and whatever duration the guy calls for.
Well there are actually 2 230/236 cams (the xe and xfi ones from comp) and people have done well with those (over 360rw on stock heads), then there are the 2 AI cams 226/234 and 230/238, there is the comp 233/239 (probably still too big), Lunati has several one 226/234 and a 231/239 I think.
And there is always custom.
And there is always custom.
If you dont want to spin past 6200rpm you will even be hindering yourself with the cc503 even. Either look into some smaller cams or decide if you want to take the risk and spin the short block up higher so you can run a larger cam.
you should read this carefully:
https://ls1tech.com/forums/showthread.php?t=836200
you should read this carefully:
https://ls1tech.com/forums/showthread.php?t=836200
As far as revving to 6200 goes... thats just me setting a guideline for myself because im much more concerned about keeping my motor together than running a tenth faster. Id rather have the power on tap and not push it to its limits every time than the other way around.
Im also kind of relying on the fact that i have stock heads to keep my engine from wanting to wind straight to 7k. Id like to rip right up to about 6000 and then yes, kind of run out of breath at that point.