ENGINE SWAP VORTEC. 4X4 SUBURBAN - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70burbulgy · 04-18-2002, 10:43 PM

Just seeing if anyone know of any problems I'll run into swapping a 1998 chevy 350 into a 1970 suburban 4x4. Here's the lowdown Going to a electric fuel pump. Using an edelbrock vortec intake. Headers. Using the front dress off the orignal 1970 engine, including waterpump. Which flywheel do I use? Thanks for anyhelp that can be provided.

---------------------------------------------

1972 CHEVY LWB. MOSTLY ORIGNAL 80,000 MILES
1970 GMC SUBURBAN 4X4. RUSTY AND ULGY.

slam33 · 04-18-2002, 10:47 PM

I don't think the flywheel will be a problem but your going to need the electronics off the 98

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71 basic C-10 350. The only option is the rust.No nothing on it, but thats all about to change. <A HREF="http://www.geocities.com/stevemau/slam33page.html?1004806705410

" TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410

</A>

Longhorn Man · 04-18-2002, 10:50 PM

Not with that intake and a carb he won't.
If you have A/C, you might have a problem with holes in the heads. Other than that and the lack of a fuel pump hole (which you are already addressing) it should be a slam dunk.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

Blazer1970 · 04-19-2002, 06:57 AM

You need to use the flywheel / flexplate off the new engine. The bolt pattern on the crank changed in '86 when they went to the one piece rear main seal.

------------------
Tim

Longhorn Man · 04-19-2002, 02:07 PM

Was it just the shape, or was it the bolt pattern too? I have wondered this for a while, never had both in my hand at the smae time though.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

70burbulgy · 04-19-2002, 07:27 PM

I'll have both of them in my hand tomorrow

Longhorn Man · 04-19-2002, 07:46 PM

Wouldn't be to shocked if the starters are not the same...bolt patern, tooth count...there's a couple variables there.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

70burbulgy · 04-22-2002, 10:15 PM

Flywheel off the 1998 worked with the the 1970 starter fine. Thanks guys.
Few other problems that I found was the alternator bracket on the 1970 had very little ajustment on the 1998 valve covers. Had to grind a bolt off the 1998 engine timing cover to get the waterpump to fit. Temperature sender hole is a different size (used the sender off the 1998, just cut the connecting wire off of it and spliced it). Otherwise it went very smoothly and is running great. Need to get the edelbrock carb dialed in though.

Longhorn Man · 04-22-2002, 10:41 PM

Sounds pretty d@mn cool to me.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

*primer67* · 04-23-2002, 12:56 AM

I did it to mine, I used a newer 700r4 though
--driveshaft is a little different, and you probably want to push the motor towards the cab about 1-1/2" or so. I have pics somewhere of the motor - try looking at webshots, "find user" - primer67 and there are some older pics of when I first started the truck project.

------------------
1967 C-10 Longbed
rollpanned front&back
'91 5.7 liter/vortec heads, 700r4 trans. holley headers, holley fuelpump, holley mufflers. converted to edelbrock performer/carter 750
hei/advanced recurve
5 bucks a plug even!
"anything for the lady"
soon to be lowered "a little" looking for a good tonneau, and cowl hood.

04-18-2002, 10:43 PM	#1
70burbulgy Registered User Join Date: Feb 2002 Location: McPherson, KS 67460 Posts: 60	ENGINE SWAP VORTEC. 4X4 SUBURBAN Just seeing if anyone know of any problems I'll run into swapping a 1998 chevy 350 into a 1970 suburban 4x4. Here's the lowdown Going to a electric fuel pump. Using an edelbrock vortec intake. Headers. Using the front dress off the orignal 1970 engine, including waterpump. Which flywheel do I use? Thanks for anyhelp that can be provided. --------------------------------------------- 1972 CHEVY LWB. MOSTLY ORIGNAL 80,000 MILES 1970 GMC SUBURBAN 4X4. RUSTY AND ULGY.

04-18-2002, 10:47 PM	#2
slam33 Registered User Join Date: Aug 2001 Location: Long Beach, Ca Posts: 1,432	I don't think the flywheel will be a problem but your going to need the electronics off the 98 ------------------ 71 basic C-10 350. The only option is the rust.No nothing on it, but thats all about to change. <A HREF="http://www.geocities.com/stevemau/slam33page.html?1004806705410 " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A> __________________ 71 LWB 350/350still working on it but it's going tp be sweet. www.geocities.com/stevemau/slam33page.html " TARGET=_blank>http://www.geocities.com/stevemau/slam33page.html?1004806705410 </A>

04-19-2002, 06:57 AM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	You need to use the flywheel / flexplate off the new engine. The bolt pattern on the crank changed in '86 when they went to the one piece rear main seal. ------------------ Tim __________________ Tim

04-18-2002, 10:50 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Not with that intake and a carb he won't. If you have A/C, you might have a problem with holes in the heads. Other than that and the lack of a fuel pump hole (which you are already addressing) it should be a slam dunk. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio

04-19-2002, 02:07 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Was it just the shape, or was it the bolt pattern too? I have wondered this for a while, never had both in my hand at the smae time though. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio

04-19-2002, 07:27 PM	#6
70burbulgy Registered User Join Date: Feb 2002 Location: McPherson, KS 67460 Posts: 60	I'll have both of them in my hand tomorrow

04-19-2002, 07:46 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Wouldn't be to shocked if the starters are not the same...bolt patern, tooth count...there's a couple variables there. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio

04-22-2002, 10:15 PM	#8
70burbulgy Registered User Join Date: Feb 2002 Location: McPherson, KS 67460 Posts: 60	Flywheel off the 1998 worked with the the 1970 starter fine. Thanks guys. Few other problems that I found was the alternator bracket on the 1970 had very little ajustment on the 1998 valve covers. Had to grind a bolt off the 1998 engine timing cover to get the waterpump to fit. Temperature sender hole is a different size (used the sender off the 1998, just cut the connecting wire off of it and spliced it). Otherwise it went very smoothly and is running great. Need to get the edelbrock carb dialed in though.

04-22-2002, 10:41 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Sounds pretty d@mn cool to me. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio

04-23-2002, 12:56 AM	#10
primer67 Account Suspended Join Date: Oct 2001 Location: phoenix, AZ. Posts: 181	I did it to mine, I used a newer 700r4 though --driveshaft is a little different, and you probably want to push the motor towards the cab about 1-1/2" or so. I have pics somewhere of the motor - try looking at webshots, "find user" - primer67 and there are some older pics of when I first started the truck project. ------------------ 1967 C-10 Longbed rollpanned front&back '91 5.7 liter/vortec heads, 700r4 trans. holley headers, holley fuelpump, holley mufflers. converted to edelbrock performer/carter 750 hei/advanced recurve 5 bucks a plug even! "anything for the lady" soon to be lowered "a little" looking for a good tonneau, and cowl hood.



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