LS Manifold Swap - Stock ECU? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**SactoJim** · 11-15-2010, 08:59 PM

Could you take a stock manifold off an LS motor and replace it with an aluminum (carb style with injector bosses) manifold, put a 4-barrel style throttle body on it (with IAC & TPS), put 8 injectors in the manifold, and make it work with a factory ECU?

Not so much interested in performance gains (if any) as I am in achieving a certain look.

68GMCCustom · 11-16-2010, 12:21 AM

yes.....I believe so. You're not really changing much...since fuel and spark is still being handled the same and only the air intake path/entry is different...w/o being problematic. Not sure what little gotchas there are tho...

I had the same desire...as far as look...but I went all the way with a carb.

**SactoJim** · 11-17-2010, 12:53 AM

Thanks 68GMCCustom.......btw.....just went through your build....NICE!

68GMCCustom · 11-17-2010, 10:59 AM

Thanks! Its really been more about the drivetrain upgrade, tho I did lower it and put big sway bars on to try and make it handle a bit better. My dream is to have a custom coilover IFS with rack and pinion and bags (and maybe 4 link or even something with a watts link - tho I don't like their look) on the back to really make it handle. It'll be a year or so before I get to the paint and body as well as interior upgrades...but at least it'll be a blast to drive (and race) while I'm waiting for the coin for the next phase!

swb85 · 11-17-2010, 03:24 PM

Quote:

Originally Posted by SactoJim

Could you take a stock manifold off an LS motor and replace it with an aluminum (carb style with injector bosses) manifold, put a 4-barrel style throttle body on it (with IAC & TPS), put 8 injectors in the manifold, and make it work with a factory ECU?

Yes, lots of people do it. The factory ECM doesn't care what orientation everything is in, so long as it's all there (tps, iac etc etc). You'll gain some upper end HP but may lose a little low/mid tq compared to a factory plastic front fed intake.

11-15-2010, 08:59 PM	#1
SactoJim Registered User Join Date: Oct 2005 Location: Sacramento, CA Posts: 1,970	LS Manifold Swap - Stock ECU? Could you take a stock manifold off an LS motor and replace it with an aluminum (carb style with injector bosses) manifold, put a 4-barrel style throttle body on it (with IAC & TPS), put 8 injectors in the manifold, and make it work with a factory ECU? Not so much interested in performance gains (if any) as I am in achieving a certain look. __________________ 72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank - My Build Thread

11-16-2010, 12:21 AM	#2
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: LS Manifold Swap - Stock ECU? yes.....I believe so. You're not really changing much...since fuel and spark is still being handled the same and only the air intake path/entry is different...w/o being problematic. Not sure what little gotchas there are tho... I had the same desire...as far as look...but I went all the way with a carb. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

11-17-2010, 12:53 AM	#3
SactoJim Registered User Join Date: Oct 2005 Location: Sacramento, CA Posts: 1,970	Re: LS Manifold Swap - Stock ECU? Thanks 68GMCCustom.......btw.....just went through your build....NICE! __________________ 72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank - My Build Thread

11-17-2010, 10:59 AM	#4
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: LS Manifold Swap - Stock ECU? Thanks! Its really been more about the drivetrain upgrade, tho I did lower it and put big sway bars on to try and make it handle a bit better. My dream is to have a custom coilover IFS with rack and pinion and bags (and maybe 4 link or even something with a watts link - tho I don't like their look) on the back to really make it handle. It'll be a year or so before I get to the paint and body as well as interior upgrades...but at least it'll be a blast to drive (and race) while I'm waiting for the coin for the next phase! __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken



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