Who has done this change over before? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dubie · 08-16-2002, 11:58 AM

It's the ol inline 6 swap to the 350 thing again. I figure if I'm gonna rebuild the engine and everything else, I might as well move the engine up to the V8 position. My questions is about the 3 spd tranny. I take it, it will have to be moved up as well, but what do you have to do to it. The shift linkages would be out and so would the driveshaft. I need some input on this problem.

Wondering if I should just hold off and get a 4spd and do it right.

Any thought on this?

diggin69 · 08-16-2002, 12:04 PM

all you have to do is take the six out & put the 350 in you can even use the fly wheel of the six & put on the 8 you will need to get a differnt pivot for the clutch that goes on the side of the block if you are going with headers, other than that you should have no problems, the H.E.I. will be a very tight fit but it all can be done!

dubie · 08-16-2002, 12:17 PM

Yeah, that's if I drop my 350 on the inline stands, but what if I move the engine up to the V8 position?

da-burb · 08-16-2002, 01:00 PM

Would you be looking for the truck 4spd or one of the sportier 4spds? If you get to The TwinCities area of MN I have a complete truck 4spd sitting in my machine shed right now. Came out of a 72 GMC C20.

Estanley · 08-16-2002, 01:09 PM

You'll need sbv8 engine towers, a longer drive shaft (I've been told that its 59 1/2")and the pivot for the clutch that has been mentioned. I think it is called a Z-bar. I think you will also need the auto crossmember. I know you are going to run the 3 speed man. but when you move it up you will need the auto xmember to bolt to the tail of the tranny. You'll also have to remove the I6 tranny xmember of you are moving things up.

**tkeduk8r** · 08-16-2002, 01:23 PM

hey da-burb, i just live up here in St. Cloud.. and i just bought a 74 c10 2wd w /I6 and 3ontree... but would like some info on that 4sp you got int he shed... i dont know if i want to go there, this is a beater to pick up parts for my 70 and engine for the 84 olds, but then i am an addict and would like the creeper gear... any details??? thanks
--mike

okietruck · 08-16-2002, 01:25 PM

I did my swap exactly like diggin69 said. I got some V8 stands from the salvage, mounted them to the engine, stabbed the engine, marked the bolt locations, pulled the engine and drilled the holes. Worked out great.

diggin69 · 08-16-2002, 04:15 PM

That V-8 will drop in you dont have to move anything & the motor mounts for the 6 will work you wont have to move anything or get V-8 mounts the only thing is if you go with a H.E.I it will be tight......but almost all the stuff you have know will work, even the fly wheel off the 6-banger.

dubie · 08-16-2002, 04:49 PM

I think I will more than likely stay with the V8 in the inline position. I will have the father in law, channel the firewall where the HEI sits. He's a Boilermaker/welder/mechanic, so he's kinda my ace in the hole when it comes to metal work and mechanical.

BobM · 08-16-2002, 06:42 PM

Hey Dubie

I did the I6 to SB V8 a couple of years ago. Used the I6 mounts, bell housing, clutch assembly, starter & rad. Only problem I had was converting the clutch linkage. Had to fabricate an engine pivot ball bracket for the "Z" bar. When using the I6 location the pivot ball mounting hole is about four inches too far back. The other only other problem you might have is connecting up the accelorator linkage to the carb. Also if you are using ram horn exhaust manifolds, get the ones with the straight down outlets. The angle back ones won't clear the clutch linkage on the driver's side.

A lot of guys prefer the I6 location for the V8 as it sits lower and further back giving you better wait distribution and centre of gravity.

Bob

Jwill41 · 08-16-2002, 07:17 PM

mine is in the 6 position

Jwill41 · 08-16-2002, 07:23 PM

maybe this time

Jwill41 · 08-16-2002, 07:28 PM

in the 6 position

Jwill41 · 08-16-2002, 07:33 PM

and

frost89434 · 08-16-2002, 08:50 PM

I've got mine in the I6 position and didn't even have a problem putting in the hei.

Gordo · 08-16-2002, 09:16 PM

Dropped my 350 in where the six in a row sat, no problems, including the HEI.

08-16-2002, 11:58 AM	#1
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	Who has done this change over before? It's the ol inline 6 swap to the 350 thing again. I figure if I'm gonna rebuild the engine and everything else, I might as well move the engine up to the V8 position. My questions is about the 3 spd tranny. I take it, it will have to be moved up as well, but what do you have to do to it. The shift linkages would be out and so would the driveshaft. I need some input on this problem. Wondering if I should just hold off and get a 4spd and do it right. Any thought on this? __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

08-16-2002, 12:04 PM	#2
diggin69 Southern but in Ohio!!!! Join Date: Jan 2002 Location: Eaton,Oh. 45320 Posts: 467	all you have to do is take the six out & put the 350 in you can even use the fly wheel of the six & put on the 8 you will need to get a differnt pivot for the clutch that goes on the side of the block if you are going with headers, other than that you should have no problems, the H.E.I. will be a very tight fit but it all can be done! __________________ 1969 C/10 3/4 ton 4x4 longbed custom, frame made from a 79 1972 custom-10 half/ton longbed 1980 1/2 ton 4x4 all original 350/350/205 with air Eaton,Oh rebelryder@hotmail.com

08-16-2002, 12:17 PM	#3
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	Yeah, that's if I drop my 350 on the inline stands, but what if I move the engine up to the V8 position? __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

08-16-2002, 01:00 PM	#4
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Would you be looking for the truck 4spd or one of the sportier 4spds? If you get to The TwinCities area of MN I have a complete truck 4spd sitting in my machine shed right now. Came out of a 72 GMC C20. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

08-16-2002, 01:23 PM	#6
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	hey da-burb, i just live up here in St. Cloud.. and i just bought a 74 c10 2wd w /I6 and 3ontree... but would like some info on that 4sp you got int he shed... i dont know if i want to go there, this is a beater to pick up parts for my 70 and engine for the 84 olds, but then i am an addict and would like the creeper gear... any details??? thanks --mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

08-16-2002, 01:09 PM	#5
Estanley Registered User Join Date: Nov 2001 Location: Eatonton, GA, USA Posts: 191	You'll need sbv8 engine towers, a longer drive shaft (I've been told that its 59 1/2")and the pivot for the clutch that has been mentioned. I think it is called a Z-bar. I think you will also need the auto crossmember. I know you are going to run the 3 speed man. but when you move it up you will need the auto xmember to bolt to the tail of the tranny. You'll also have to remove the I6 tranny xmember of you are moving things up.

08-16-2002, 01:25 PM	#7
okietruck Registered User Join Date: Apr 2002 Location: Tulsa, OK, USA Posts: 117	I did my swap exactly like diggin69 said. I got some V8 stands from the salvage, mounted them to the engine, stabbed the engine, marked the bolt locations, pulled the engine and drilled the holes. Worked out great.

08-16-2002, 04:15 PM	#8
diggin69 Southern but in Ohio!!!! Join Date: Jan 2002 Location: Eaton,Oh. 45320 Posts: 467	That V-8 will drop in you dont have to move anything & the motor mounts for the 6 will work you wont have to move anything or get V-8 mounts the only thing is if you go with a H.E.I it will be tight......but almost all the stuff you have know will work, even the fly wheel off the 6-banger. __________________ 1969 C/10 3/4 ton 4x4 longbed custom, frame made from a 79 1972 custom-10 half/ton longbed 1980 1/2 ton 4x4 all original 350/350/205 with air Eaton,Oh rebelryder@hotmail.com

08-16-2002, 04:49 PM	#9
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	I think I will more than likely stay with the V8 in the inline position. I will have the father in law, channel the firewall where the HEI sits. He's a Boilermaker/welder/mechanic, so he's kinda my ace in the hole when it comes to metal work and mechanical. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

08-16-2002, 06:42 PM	#10
BobM Registered User Join Date: Feb 2001 Location: Winnipeg, MB, Canada Posts: 73	Hey Dubie I did the I6 to SB V8 a couple of years ago. Used the I6 mounts, bell housing, clutch assembly, starter & rad. Only problem I had was converting the clutch linkage. Had to fabricate an engine pivot ball bracket for the "Z" bar. When using the I6 location the pivot ball mounting hole is about four inches too far back. The other only other problem you might have is connecting up the accelorator linkage to the carb. Also if you are using ram horn exhaust manifolds, get the ones with the straight down outlets. The angle back ones won't clear the clutch linkage on the driver's side. A lot of guys prefer the I6 location for the V8 as it sits lower and further back giving you better wait distribution and centre of gravity. Bob

08-16-2002, 07:17 PM	#11
Jwill41 Registered User Join Date: Aug 2002 Location: Farmers Branch, Tx Posts: 1,009	mine is in the 6 position __________________ http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club Last edited by Jwill41; 08-16-2002 at 07:21 PM.

08-16-2002, 07:23 PM	#12
Jwill41 Registered User Join Date: Aug 2002 Location: Farmers Branch, Tx Posts: 1,009	maybe this time __________________ http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club Last edited by Jwill41; 08-16-2002 at 07:30 PM.

08-16-2002, 07:28 PM	#13
Jwill41 Registered User Join Date: Aug 2002 Location: Farmers Branch, Tx Posts: 1,009	in the 6 position Attached Images __________________ http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club

08-16-2002, 07:33 PM	#14
Jwill41 Registered User Join Date: Aug 2002 Location: Farmers Branch, Tx Posts: 1,009	and __________________ http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club

08-16-2002, 08:50 PM	#15
frost89434 Registered User Join Date: Nov 2001 Location: sparks, NV Posts: 1,141	I've got mine in the I6 position and didn't even have a problem putting in the hei. __________________ 68 short fleet with 71 front clip 2wd jaguar blue 99 chevy ext cab shrtbed z71 loaded 99 chevy swb fleetside(daily driver) Sparks, Nevada



Register or Log In To remove these advertisements.

08-16-2002, 09:16 PM	#16
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Dropped my 350 in where the six in a row sat, no problems, including the HEI. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

Register or Log In To remove these advertisements.