change to V8 and keep 3speed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davidh · 02-25-2005, 06:43 PM

Okay, now I'm confused. I have a 67, 3speed, 292. I want to change out to a V8. Some of you say keep the 3speed in the same spot, mount the 8cyl in the 6cyl holes, therefore I don't have to mess with the driveshaft.

But WAIT! Assuming I can't use my Zbar now from 6cyl now I have to get one off a V8 motor but then the spot in the frame for the V8 Zbar would be off in 6cy positon. Right?

So do I mount everything in the 8cyl positon then get a different front driveshaft?

Or will the Zbar from the V8 fit in I-6 zbar postion?
Please help. This is getting confusing. David

71meangreenc10 · 02-25-2005, 06:59 PM

I changed mine over from a 6 to a 8, in my opinion the best thing to do is change everything, I moved mine up to the 8 holes, got the right z bar, extended the driveshaft, get the proper steel mounts for the motor mounts, now on mine i had to get a different crossmember to move the trans up, the 6 trans crossmember and 1 I found in a yard for a 8 truck were different, I am very happy with the results, if you leave it in the 6 holes the engine will be close to the firewall, I dont like that, the only way anyone can tell my truck was a 6 truck is to look at the vin,,,,,,,If im right the z bar wont work at all, If I recall the z bar for a 6 is longer than the 8......

davidh · 02-25-2005, 08:30 PM

So, does anyone have a V8 zbar and the tranny mount for the 67-72 that has changed out to automatic? If they didn't just throw it away....

71meangreenc10 · 02-25-2005, 09:04 PM

you can get the z bar from some of the vendors, check with atheys truck parts, he may have a used crossmember,,,,,

Tx Firefighter · 02-26-2005, 11:18 AM

I've always reused the 6 cylinder z-bar and screwed a pivot ball into the V8 engine.

69 longhorn · 02-27-2005, 01:05 AM

with a 292 equipped truck, you will need to swap the rh frame stand , to mount in the I6 (250) spot. the 292 has staggered stands. for me, i use the V8 Zbar & top rod, with a screw in ball in the FOWARD hole in the block. the bottom rod will need to be adjusted, & the hloes redrilled in the frame (for the outter bracket), to get the Z bar pretty much perpendicular to the eng block. set up like this, you can run the rams horns, or opt for a 69090 set of hedmans......i think the Hooker comps will also fit, but my setup is a little different than the norm.....69L

Tx Firefighter · 02-27-2005, 07:43 AM

Quote:

Originally Posted by 69 longhorn

....i think the Hooker comps will also fit, but my setup is a little different than the norm.....69L

When I swapped a V8 into inline position, I also used a screw in ball pivot, rather than the bolt-on-with-2 bolts normal V8 one. I used the Hooker comps too, no problems.

My truck, I used the I6 z-bar too though. Seems like I may have bent one of the arms with a prybar to make everything line up though. But, it was definitely the I6 z-bar

davidh · 02-27-2005, 06:59 PM

I got the motor stands off a 67 3/4 V8 frame. should I just put them in place of the 6cyl??

02-25-2005, 06:43 PM	#1
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	change to V8 and keep 3speed Okay, now I'm confused. I have a 67, 3speed, 292. I want to change out to a V8. Some of you say keep the 3speed in the same spot, mount the 8cyl in the 6cyl holes, therefore I don't have to mess with the driveshaft. But WAIT! Assuming I can't use my Zbar now from 6cyl now I have to get one off a V8 motor but then the spot in the frame for the V8 Zbar would be off in 6cy positon. Right? So do I mount everything in the 8cyl positon then get a different front driveshaft? Or will the Zbar from the V8 fit in I-6 zbar postion? Please help. This is getting confusing. David

02-25-2005, 06:59 PM	#2
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	I changed mine over from a 6 to a 8, in my opinion the best thing to do is change everything, I moved mine up to the 8 holes, got the right z bar, extended the driveshaft, get the proper steel mounts for the motor mounts, now on mine i had to get a different crossmember to move the trans up, the 6 trans crossmember and 1 I found in a yard for a 8 truck were different, I am very happy with the results, if you leave it in the 6 holes the engine will be close to the firewall, I dont like that, the only way anyone can tell my truck was a 6 truck is to look at the vin,,,,,,,If im right the z bar wont work at all, If I recall the z bar for a 6 is longer than the 8...... __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

02-25-2005, 08:30 PM	#3
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	3sp So, does anyone have a V8 zbar and the tranny mount for the 67-72 that has changed out to automatic? If they didn't just throw it away....

02-25-2005, 09:04 PM	#4
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	you can get the z bar from some of the vendors, check with atheys truck parts, he may have a used crossmember,,,,, __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

02-26-2005, 11:18 AM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	I've always reused the 6 cylinder z-bar and screwed a pivot ball into the V8 engine. __________________ I'm on the Instagram- @Gearhead_Kevin

02-27-2005, 01:05 AM	#6
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	with a 292 equipped truck, you will need to swap the rh frame stand , to mount in the I6 (250) spot. the 292 has staggered stands. for me, i use the V8 Zbar & top rod, with a screw in ball in the FOWARD hole in the block. the bottom rod will need to be adjusted, & the hloes redrilled in the frame (for the outter bracket), to get the Z bar pretty much perpendicular to the eng block. set up like this, you can run the rams horns, or opt for a 69090 set of hedmans......i think the Hooker comps will also fit, but my setup is a little different than the norm.....69L __________________ http://community.webshots.com/user/hotrodhorn

02-27-2005, 06:59 PM	#8
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	I-6 to V8 I got the motor stands off a 67 3/4 V8 frame. should I just put them in place of the 6cyl??



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.