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jyfatboy

This is a discussion on jyfatboy within the Internal Engine forums, part of the LSx Technical Help Section category; okay guys need help on picking out intake maniflod. I have a 1998 z28, the short block is stock and ...

  1. #1
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    black
    1998 camaro z28

    intake manifold for ls1

    okay guys need help on picking out intake maniflod. I have a 1998 z28, the short block is stock and i have a comp cams 600" list camp and ported heads and mac mid lenght headers. Have anybody tried a thphoon intake.
    Last edited by jyfatboy; 03-22-2007 at 07:25 PM.

  2. #2
    Ultimate nothing
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    2000 Trans Am

    Go with an LS6, good gains for modest money. Anything larger would be overkill for what you have.

  3. #3
    Member 2001hawk's Avatar
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    Black & Black
    2001 Firehawk & 2002 WS-6

    The LS1 and LS6 manifolds are both nylon. The FAST LSX manifold is composite. I would go with something along those lines, because they are won't heat soak like metal ones will. Unless you are running alot of nitrous or boost, but since you didn't mention either that is my $0.02. The 78mm LS6 manifold is going to be cheaper as stated above (couple hundred bucks used), but you can get 90mm with FAST's LSX and you may want to consider it since said you have ported heads and a high lift cam. Just keep in mind that you are talking a grand or more if you go 90mm because you also have to get a throttle body. When I bought my 90mm LSX manifold it was $1,050 I think, Texas Speed was running a combo deal.

  4. #4
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    black
    1998 camaro z28

    intake manifold for ls1

    thanks for the advise .i plan on putting a 150 shot of nitrous on the engine, would you suggest the fast intake manifold with a 90mm throttle body.

  5. #5
    member since may 2000 nhraformula's Avatar
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    2000 nhra edition formula

    you want the fast intake. it will go good with your set up and N20
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  6. #6
    Member 2001hawk's Avatar
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    2001 Firehawk & 2002 WS-6

    From what I have read if you are pushing a lot of lift and RPM's, that is when the 90mm becomes most effective. I wouldn't spend the time and money to go back 78mm. It is a pretty straight forward mod comes with good instructions. It went on my 02 WS6 so I don't know how the drilling out the hole for the EGR will go for you, but it has a big area there and you will need a dremel. The hole thing took me around a day, of course I was taking my time, B/Sing, and hadn't done it before. As far as whether I actually picked up any power and how much I don't know cause I didn't dyno it beforehand, but that car pushes pretty hard. Hope it helps. Are you going dry shot or wet?

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