Best fit stock exhaust manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

spyderbilt · 07-29-2012, 03:08 PM

Im ready to start purchasing swap items and need to know what stock exhaust manifolds work best in a 70 c20 2wd.
Im using an LS1 from a corvette along with a 2002 4l80e.
I have the corvette manifolds, just have not read about anyone using them.

Thanks
GS

70' C20 CST
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usmcchevy · 07-29-2012, 08:50 PM

Trail Blazer SS manifolds are popular, you will need to trim the drivers side trans "wing" a little.
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Custom 68 · 07-30-2012, 10:20 AM

I used the ls6 Corvette manifolds. They worked and fit great. I then swapped to some mid length camaro headers they also fit good. I am now turbo charged so I went back to the stock truck manifold on the driverside.
I built my own mounts so it will be different for each different mount. I had read the corvette manifolds performed as well as headers so I used them. I did a littl trimming on the frame rails but it was minimal.
I say use them...
Dave

mcmlxix · 07-31-2012, 05:06 AM

check out this thread HERE

spyderbilt · 07-31-2012, 06:35 PM

Good info. Thanks.
I think i will end up building my own motor mounts and try to use the corvette manifolds. Im just concerned with motor mounts and manifolds interfering with my A/C compressor in the stock Vette location.
Any thoughts on moving the motor forward or back for tranny or any other clearances. Ill be using a 4l80e.

Thanks
GS

70' C20 CST.
Posted via Mobile Device

BigShoe24 · 07-31-2012, 09:52 PM

I've got a set off an LS3

07-29-2012, 03:08 PM	#1
spyderbilt Registered User Join Date: Feb 2011 Location: san antonio texas Posts: 5	Best fit stock exhaust manifold Im ready to start purchasing swap items and need to know what stock exhaust manifolds work best in a 70 c20 2wd. Im using an LS1 from a corvette along with a 2002 4l80e. I have the corvette manifolds, just have not read about anyone using them. Thanks GS 70' C20 CST Posted via Mobile Device

07-29-2012, 08:50 PM	#2
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: Best fit stock exhaust manifold Trail Blazer SS manifolds are popular, you will need to trim the drivers side trans "wing" a little. Posted via Mobile Device __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

07-30-2012, 10:20 AM	#3
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,928	Re: Best fit stock exhaust manifold I used the ls6 Corvette manifolds. They worked and fit great. I then swapped to some mid length camaro headers they also fit good. I am now turbo charged so I went back to the stock truck manifold on the driverside. I built my own mounts so it will be different for each different mount. I had read the corvette manifolds performed as well as headers so I used them. I did a littl trimming on the frame rails but it was minimal. I say use them... Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-31-2012, 05:06 AM	#4
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	Re: Best fit stock exhaust manifold check out this thread HERE __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

07-31-2012, 06:35 PM	#5
spyderbilt Registered User Join Date: Feb 2011 Location: san antonio texas Posts: 5	Re: Best fit stock exhaust manifold Good info. Thanks. I think i will end up building my own motor mounts and try to use the corvette manifolds. Im just concerned with motor mounts and manifolds interfering with my A/C compressor in the stock Vette location. Any thoughts on moving the motor forward or back for tranny or any other clearances. Ill be using a 4l80e. Thanks GS 70' C20 CST. Posted via Mobile Device

07-31-2012, 09:52 PM	#6
BigShoe24 True Addiction Join Date: Nov 2005 Location: FTL Posts: 415	Re: Best fit stock exhaust manifold I've got a set off an LS3 __________________ RCC



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