View Poll Results: Which Intake Manifold Would Suit my Needs the Best?
port ls6 manifold and sell fast 78 for mod money
4
30.77%
use fast 78 intake and sell ls6 (no porting)
2
15.38%
port fast 78 intake and sell ls6
2
15.38%
Get a 90/90 setup (no porting)
2
15.38%
Get a 90/90 ported setup
3
23.08%
Voters: 13. You may not vote on this poll
Intake Manifold Advice Wanted
11-03-2006, 01:27 PM
#1
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Intake Manifold Advice Wanted I recently won a used fast 78 intake manifold on ebay, but have not yet put it on my car. I will be installing a cam & heads within the next month or two and I want everyones advice on what to do for an intake manifold. I'm still a little undecided on the cam, but it will be somewhere from a tr224 to a torquer v3 size. My heads will either be cnc ported ls6 heads or ported 5.3 heads. My car is not driven much, but I want a fast street car which can also hold its own at the strip. I know that I can sell my ls6 for about 300 and the fast 78 for about 500 so that could get me a fast 90 intake so all I would need to buy is a throttle body.
I am concerned about ditching the ls6 and fast 78 in favor of the fast 90 because I want good power under the curve...not just 5000 rpm+.
What would you do and why? See my mods listed below (also note that I already have a true 78mm throttle body I got off ebay)
I am concerned about ditching the ls6 and fast 78 in favor of the fast 90 because I want good power under the curve...not just 5000 rpm+.
What would you do and why? See my mods listed below (also note that I already have a true 78mm throttle body I got off ebay)
11-05-2006, 03:18 PM
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If I'm not mistaken, the Fast 78 intake is pretty much the same as an LS6 intake, so you aren't really going to see any additional benefits over the LS6. Sell em both and get the 90/90...
11-06-2006, 11:02 PM
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Originally Posted by DarthQuaider
I soon want to do a 90/90 setup with mild cam and heads also, if you gone do it-do it BIG!
No need to go big unless your engine calls for it (stroked, etc...) it has been proven on smaller setups the 90/90 will show loss of horsepower (insignifigant) but still not worth wasting money. Trending Topics
11-07-2006, 12:36 PM
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Due to the limited responses & wildly varying opinions I decided to self port my fast 78 which I am now in the process of.
Mostly I am just cleaning up the rough edges and sanding down the casting marks rather than hogging out material. I wouldn't expect more than 5 extra hp out of my hard work, but it gives me something to do during this crappy weather around here.
Thanks to all who responded.
BTW if anyone wants an slp ls6 intake (non egr) with a decent self ported stock throttle body (off my 99) for $350 shipped then let me know ASAP as it will go on ebay very soon.
Mostly I am just cleaning up the rough edges and sanding down the casting marks rather than hogging out material. I wouldn't expect more than 5 extra hp out of my hard work, but it gives me something to do during this crappy weather around here.
Thanks to all who responded.
BTW if anyone wants an slp ls6 intake (non egr) with a decent self ported stock throttle body (off my 99) for $350 shipped then let me know ASAP as it will go on ebay very soon.
