Need help choosing a cam...
Need help choosing a cam... I'm putting together an LS1 motor for a car of mine and was looking for advice on the best performing cam for what I want to do. Basically it will be a stock rebuilt shortblock with ARP hardware. I want to run a set of Patriot stage-2 LS6 heads with an Edelbrock Victor Jr. intake and a Quickfuel 650 cfm carburetor. I'm looking for a cam that will allow me to make the best possible numbers...Driveability and idle quality aren't a concern. The motor will be backed by a built th400 and I'll have a converter designed to work with whatever cam I end up going with.
So basically I'm looking for advice on which cam to run with this head and intake setup. Also looking to see if the heads should be milled at all and which set of head gaskets to run.
Thanks in advance...
So basically I'm looking for advice on which cam to run with this head and intake setup. Also looking to see if the heads should be milled at all and which set of head gaskets to run.
Thanks in advance...
Originally Posted by b00sted
I'm putting together an LS1 motor for a car of mine and was looking for advice on the best performing cam for what I want to do. Basically it will be a stock rebuilt shortblock with ARP hardware. I want to run a set of Patriot stage-2 LS6 heads with an Edelbrock Victor Jr. intake and a Quickfuel 650 cfm carburetor. I'm looking for a cam that will allow me to make the best possible numbers...Driveability and idle quality aren't a concern. The motor will be backed by a built th400 and I'll have a converter designed to work with whatever cam I end up going with.
So basically I'm looking for advice on which cam to run with this head and intake setup. Also looking to see if the heads should be milled at all and which set of head gaskets to run.
Thanks in advance...
So basically I'm looking for advice on which cam to run with this head and intake setup. Also looking to see if the heads should be milled at all and which set of head gaskets to run.
Thanks in advance...
I'll go out on a limb and say people here seem to hate carbs. ........
and 650 is smallish for real perfomance. Well I wasn't asking anyone for their personaly preference on carbs or efi...I was just looking to see who's run a similar setup and knows which cam will perform best.
As far as the carb size, at 100% VE on a 346 revving to 6500 rpm, it requires exactly 650 cfm. Since the motor wont have 100% VE it actually only requires 618 cfm at 95% VE which I figure this motor will be around with a healthy cam and the nice flowing heads...So I think the 650 quickfuel should work great on it.
As far as the carb size, at 100% VE on a 346 revving to 6500 rpm, it requires exactly 650 cfm. Since the motor wont have 100% VE it actually only requires 618 cfm at 95% VE which I figure this motor will be around with a healthy cam and the nice flowing heads...So I think the 650 quickfuel should work great on it.
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Sorry to say but very few people have any experience running an LS1 with a carb. Carbs don't fit very well under the cowel of an F-body or Vette and most people stick to fuel injection even when given the choice.
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Originally Posted by The stunningman
I'll go out on a limb and say people here seem to hate carbs. ........ and 650 is smallish for real perfomance.
and 650 is smallish for real perfomance.
Well take it from me, bigger isn't always better. I would sit down with the engine builder or the shop doing the heads and design a cam that will match your combonation. I deal with a lot of customers wanting the BIGGEST cam they can get. I have actually seen a power decrease with too big of a cam. You have to build it up as a combonation.
Originally Posted by charlie c5
Well take it from me, bigger isn't always better. I would sit down with the engine builder or the shop doing the heads and design a cam that will match your combonation. I deal with a lot of customers wanting the BIGGEST cam they can get. I have actually seen a power decrease with too big of a cam. You have to build it up as a combonation.
Originally Posted by orangeapeel
I am going to go out on a limb and say that you don't know anything about carbs. You can run a 650 vacuum secondary and get serious power. You can over-jet and get a too rich motor that runs bad with running a bigger carb. Don't come here thinking that we all know nothing about carburetors. Not just EFI guys here man.
Sorry hoss you don't know me . I know plenty about carbs and combo's. I build engines and tune them at the track and yes 650 is small on a hi-po SBC application. Most engines I build are old school 406's and 383's CARBED with 750 and 850 DP's. I'm looking for info on the LS1 in general and most the info I have found has intrigued me quite a bit to fuel injection. ALSO It would seem to be better to be a little rich than lean on a hi-po motor especially with stock pistons and no knock sensor to save your combo should you hit detonation.
BTW to the initial poster I would go larger and use a wideband to adjust the jets,pump cam and secondaries if I were doing this.
Some links for you.
http://www.superchevy.com/technical/...s/0409sc_gmpp/
Theres also a guy on third gen org Stage20 who has a carbed 6.0 he is running a 830cfm carb. he runs 7.16 @96 mph cam only internal mod.
his engine pic:
Last edited by The stunningman; Sep 19, 2006 at 11:55 PM.
