LS2 Performance Intakes
Thread Starter
Teching In
Joined: Nov 2006
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From: North Carolina
LS2 Performance Intakes As of 1:17 PM today, my GTO is officially no longer under warranty. Soon, I will be starting a top-end build up on my LS2- AFR heads, COMP cam, SLP longtubes, ect. I need some help/advice with the intake manifold. FAST has a really nice looking piece, with its 90 mm throttle body setup and integrated nitrous ports and portable three-piece design and what not. But an issue of popular hotrodding magazine (my inspiration for this build up) says that on an LS2 fuel rail, the hold-down bracket does not line up with the holes on the intake. Solutions anyone?
Also, what about the LS7 intake? Has anyone done it? Its cheaper by half than the FAST intake, yet it has those big rectangular ports.
Thanks for any help.
Also, what about the LS7 intake? Has anyone done it? Its cheaper by half than the FAST intake, yet it has those big rectangular ports.
Thanks for any help.
TECH Regular
Joined: Nov 2005
Posts: 459
Likes: 0
From: Arlington, TN
1. The LS7 manifold's Bolt pattern does not match up to the LS1 style heads.
2. F.A.S.T. is suppose to have an LS2 kit out (currently can't remember the part number and can't find it on there web site).
From all reports the difference between a ported fast manifold and a ported LS2 is about 5hp and 5ft lbs of torque across the board (under the curve and peak).
Your money would probably be better spent on having your LS2 manifold ported out (should flow better then a stock FAST LSX) and take the other $600 or so and put it twards the fuel pump upgrade and better injectors or a set of Stainless Works or Kooks LT's....
Hit the ls1gto.com forums for info on why people tend to shy away from the SLP LT's.
2. F.A.S.T. is suppose to have an LS2 kit out (currently can't remember the part number and can't find it on there web site).
From all reports the difference between a ported fast manifold and a ported LS2 is about 5hp and 5ft lbs of torque across the board (under the curve and peak).
Your money would probably be better spent on having your LS2 manifold ported out (should flow better then a stock FAST LSX) and take the other $600 or so and put it twards the fuel pump upgrade and better injectors or a set of Stainless Works or Kooks LT's....
Hit the ls1gto.com forums for info on why people tend to shy away from the SLP LT's.
ET Performance makes some LS7 heads heads that go on a 4" bore. Then you could use the LS7 intake. They are expensive heads, but if you figure the intake savings over the $1300 price for the FAST stuff, it work out. Plus those will outflow pretty much anything out there.
-Geoff
-Geoff
Here are the numbers I get - head prices were off the respective websites.
AFR's + Fast = $3774 + port matching FAST Intake
2474 + 1300
ET LS7's + GM Intake = $3566
3199 + 367
One of the benefits of the AFR's would be to use the stock rockers, factor those in and you have near a wash. Of course, who puts used rockers on $2500 heads? So you probably would get rockers with both. That leaves power as the biggest deciding factor. Somebody needs to do a shootout with these two setups and findout which one makes the most.
-Geoff
AFR's + Fast = $3774 + port matching FAST Intake
2474 + 1300
ET LS7's + GM Intake = $3566
3199 + 367
One of the benefits of the AFR's would be to use the stock rockers, factor those in and you have near a wash. Of course, who puts used rockers on $2500 heads? So you probably would get rockers with both. That leaves power as the biggest deciding factor. Somebody needs to do a shootout with these two setups and findout which one makes the most.
-Geoff
Originally Posted by White_Hawk
Here are the numbers I get - head prices were off the respective websites.
AFR's + Fast = $3774 + port matching FAST Intake
2474 + 1300
ET LS7's + GM Intake = $3566
3199 + 367
One of the benefits of the AFR's would be to use the stock rockers, factor those in and you have near a wash. Of course, who puts used rockers on $2500 heads? So you probably would get rockers with both. That leaves power as the biggest deciding factor. Somebody needs to do a shootout with these two setups and findout which one makes the most.
-Geoff
AFR's + Fast = $3774 + port matching FAST Intake
2474 + 1300
ET LS7's + GM Intake = $3566
3199 + 367
One of the benefits of the AFR's would be to use the stock rockers, factor those in and you have near a wash. Of course, who puts used rockers on $2500 heads? So you probably would get rockers with both. That leaves power as the biggest deciding factor. Somebody needs to do a shootout with these two setups and findout which one makes the most.
-Geoff
I wonder which setup would make the most power, the ET Ls7/LS7 intake, or the AFR/Fast? Anyone here with the ET setup on a 402-408?
TECH Regular
Joined: Nov 2005
Posts: 459
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From: Arlington, TN
The funny part is the LS7 manifold and TB will hook right up to his LS2 harness (I'm guess that LS7 manifold you looked at was with injectors and rails or was that bare).
Bare or Assembled the LS7 manifold comes out more affordable compared to a fast manifold (the sick part is it should look like a stock LS2 under the hood unless he dress's it up).
Bare or Assembled the LS7 manifold comes out more affordable compared to a fast manifold (the sick part is it should look like a stock LS2 under the hood unless he dress's it up).
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Or you could pick up the L92/L76 package and save a ton of money. You could literally do heads/intake/cam/headers for the price you're talking for just heads and intake in those posts above.
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And most people reving the motor will have there stockers rebuilt by us or replace the stockers with full rollers. I would not rec. running them stock they come apart very often.
Nate
Nate
Originally Posted by tmoneyr007
Ignore me if I'm wrong but I thought that the LS7 heads wouldn't fit a 4" bore???
Banned - Ed Curtis aka EDC
Joined: Aug 2006
Posts: 100
Likes: 1
Originally Posted by tmoneyr007
Ignore me if I'm wrong but I thought that the LS7 heads wouldn't fit a 4" bore???
Another/easier way to look at it, GM LS7 heads were obviously made for the LS7 engine which has a 4.125 bore. ETP has thier own LS7 head/casting which was designed for a 4" bore. 2 different heads.
Thread Starter
Teching In
Joined: Nov 2006
Posts: 21
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From: North Carolina
I havent heard anything on how much power the 4" LS7 heads and intake make, but in the issue of popular hot rodding magazine I mentioned above, they used the exact setup I plan to use and they made 572 hp on the dyno with 91 octane. I thought that was pretty sweet.
