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06-06-2009, 05:19 PM
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#1 |
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Registered User
Join Date: Apr 2008
Location: ozark mo.
Posts: 586
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5.3 conversion
I am building a 68 chevy with a 5.3 out of an 04 pickup and when I set the motor in the frame I discovered that the exhaust manifolds are going to hit the frame rails. I have already powder coated the frame so notching the frame for clearance is out of the question. What are you guys who have done this conversion doing for exhaust? I am running the early classic motor mounts just in case that is going to make a difference. Any help would be great. Thanx
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06-06-2009, 05:34 PM
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#3 |
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Registered User
Join Date: Aug 2006
Location: Florida
Posts: 1,684
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Re: 5.3 conversion
fbody 98-02 exhaust manifold will work on I know 73-87.
Or you can go with the thorleys, awesome header.
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1986 C10 SWB 6.0/6l90e Miami...Flee it like a native |
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06-06-2009, 09:19 PM
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#4 |
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Registered User
Join Date: Apr 2008
Location: ozark mo.
Posts: 586
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Re: 5.3 conversion
I spent 230.00 on the motor mounts so I am using them. The problem is the stock manifolds hit the frame so no I am not using them. I am looking for some that will fit without having to notch the frame. This is a 68 so I am not sure that the info on the 73-87 will do me any good. Thanx for the input though.
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06-06-2009, 10:31 PM
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#5 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 5.3 conversion
Ive done 5.3 conversions on a 71 & and my 85 had to cut both frames about the same amount to clear the manifolds so if F-body manifolds clear a 73-87 it should fit yours.
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06-06-2009, 11:20 PM
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#6 |
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Always wrenching!!
Join Date: Apr 2007
Location: Sacramento, CA
Posts: 301
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Re: 5.3 conversion
i cut my frame..... ive been told that 98 f-body manifolds will clear. no other year will work. I tried the truck, 99-02 f-body and 97-up corvette.
and fyi, you only have to cut the pass side frame to clear the truck manifolds.
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71 C-10 5.3L/4L60E 72 Camaro LS6/4L60E 06 Duramax 19 RZR XP4 turbo Dynamix 56 Belair 5.3/4L60E swap in progress |
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06-07-2009, 10:37 AM
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#7 |
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Registered User
 
Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,887
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Re: 5.3 conversion
there was a guy on here that successfully used trailblazer ss manifolds, not sure what engine mounts he had though. I've heard the 04-06 GTO manifolds work too, I picked up a pair for my swap but haven't started yet.
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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06-07-2009, 11:23 AM
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#8 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 5.3 conversion
IF you really want the hot thing, then look at the previous installs in the web for the headers that fit the Gen III motors into a 67-72 truck. They are made by Doug Thorley and they even had a web purchase price on here for awhile. I have a set sitting in my storage for my LS-1 that I am putting in my 68. They would fit your 5.3, also.
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06-07-2009, 12:13 PM
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#9 | |
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the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: 5.3 conversion
Quote:
im using swap headers on my 5.3 just put engine and trans in last time yesterday, im using factory mounts with s&p plates. give me a call 840-1999 later brad sweet 68 is local also, hes running custom mounts and vette manifolds
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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06-07-2009, 12:35 PM
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#10 |
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Trucks N Tranzams
Join Date: Dec 2002
Location: North Las Vegas, Nevada
Posts: 816
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Re: 5.3 conversion
Here is a link to the headers. Hart_Rod did the test fit for them.
http://www.dougthorleyheaders.com/pr...productID/1029 Here are pictures of an LS1 w 98 F-body manifolds. http://satellitehead.com/gallery/dis...album=9&pos=86
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 Don'68 Chevy LB 383 TH400/GV/373 posi '56 Chevy 4WD SWB '64 Chevy short stepside '79 Trans Am 455/TH2004R/12blt/4whldisc 95 Kia (Wifes car) 2002 S-10 extended cab pickup "God punishes small sins immediately" |
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06-07-2009, 03:33 PM
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#11 | |
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Registered User
Join Date: Mar 2008
Location: Calgary, ab
Posts: 325
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Re: 5.3 conversion
Quote:
I was going with Doug's headers so I tried them for the folks that wanted to run manifolds to see how well they fit. IMO they fit pretty darn good! Thats with the ECE gen III engine mounts. |
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06-08-2009, 11:37 AM
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#12 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,929
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Re: 5.3 conversion
I used manifolds from a ls6 (from a zo6) motor for a while, Now I did build my own motor mounts so it was made to fit...
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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!" |
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06-08-2009, 12:40 PM
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#13 |
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the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: 5.3 conversion
oops got custom 68's handle wrong sorry dave, thanks for chiming in.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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06-08-2009, 02:17 PM
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#14 |
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Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: 5.3 conversion
i used stainless steel headers for a 98-02 F-body. Fit like a glove and no clearancing the frame.
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06-08-2009, 03:58 PM
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#15 | |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,929
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Re: 5.3 conversion
Quote:
I forgot to add I did swap to mid length camaro headers. Brad and I compared or motor locations and they are pretty close. Mine maybe a tad lower but they look pretty simular except for his shiny headers 
__________________
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!" |
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