Can I use the same clutch pivot bar 6 to 8cy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davidh · 02-24-2005, 08:48 PM

I am looking at keeping my 3speed manual and dropping in a small block. Can I use the same clutch pivot rod? Will it bolt from my 6cy to my 8 with no problems???

gr8scott51 · 02-24-2005, 09:35 PM

Nope - but if you're handy, anything can be modified. Start scouring wrecking yards. Does your V8 block have the drilled and tapped boss for the Z bar? If not, you need the offset adapter plate. Dubie took some nice pics of his conversion. Send him an IM. He'll respond when he gets time, his wife just got out of the hospital.

68C15 · 02-24-2005, 11:16 PM

I thought they were the same. the I6 has a funky shaped bracket to go from the block to the Z bar whereas the V8 has the Z bar- pivot mounted right to the block.

Tx Firefighter · 02-25-2005, 08:56 AM

No, the z- bars are different. The rod between the pedal and the z-bar is different too.

If the bolt boss isn't threaded on the V8, I've drilled them and tapped threads into the block before. There is a flat spot where the hole should be. Just center punch it and drill the hole.

Brainchild · 02-25-2005, 10:14 AM

Hmmm mine has a bracket with the ball mounted on it that is right between the holes on my 350.In fact it bolts in both of them,one on each end

**CPNE** · 02-25-2005, 10:18 AM

Quote:

Originally Posted by Brainchild

Hmmm mine has a bracket with the ball mounted on it that is right between the holes on my 350.In fact it bolts in both of them,one on each end

That's the V8 block side ball stud setup for the z-bar. It's used when you put your engine in the correct (factory

) position.

Brainchild · 02-25-2005, 11:01 AM

lol I thought I used a piece I didn't need.It was in the back of the truck when I got it.

It was the only thing in the back of the truck

gr8scott51 · 02-25-2005, 04:20 PM

You're probably the only one that did it right!!

davidh · 02-25-2005, 06:29 PM

Do I need one off a truck or any car V8? This isn't clearing things up(muddy).

stickshift_or_walk · 03-03-2005, 12:29 PM

TTT for ya, and I'm confused as well.

I understand that the V8 and I6 z-bar and rod are different, since I've seen reliable folks say so. But not knowing any better at the time, I used the stock setup when we changed I6 to smallblock (factory position). I had to move the frame bracket for the z-bar, mount the ball in the side of the block, and bend the rod slightly, but everything seems to work fine.

Does anyone have pics of the different setups (I6 vs. V8 z-bar and pedal rod), or knowledge of why they are different? Is there some change in the mechanical advantage that would alter the travel or the force required?

Thanks...SSOW

1969K10 · 03-03-2005, 02:04 PM

Not an expert, but when I pulled the I-6 out of the '72 to swap in a V-8, I re-used the existing clutch Z-bar, bracktes, and pivot stud. Never had any problems with the clutch.

davidh · 03-03-2005, 02:12 PM

Where did you mount your motor? In the existing holes for the 6cy or did you move the stands?

Tx Firefighter · 03-03-2005, 02:02 PM

I just did this when I swapped my 350 over to an inline. It was a step in the right direction.

The pedal to z bar rod is straight on an inline engine and offset for the V8 engine. It's quite noticeable when you lay them next to each other, several inch offset.

02-24-2005, 08:48 PM	#1
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	Can I use the same clutch pivot bar 6 to 8cy I am looking at keeping my 3speed manual and dropping in a small block. Can I use the same clutch pivot rod? Will it bolt from my 6cy to my 8 with no problems???

02-24-2005, 09:35 PM	#2
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	Nope - but if you're handy, anything can be modified. Start scouring wrecking yards. Does your V8 block have the drilled and tapped boss for the Z bar? If not, you need the offset adapter plate. Dubie took some nice pics of his conversion. Send him an IM. He'll respond when he gets time, his wife just got out of the hospital. __________________ Silence is golden, duct tape is silver. - Scott

02-24-2005, 11:16 PM	#3
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	I thought they were the same. the I6 has a funky shaped bracket to go from the block to the Z bar whereas the V8 has the Z bar- pivot mounted right to the block. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

02-25-2005, 08:56 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	No, the z- bars are different. The rod between the pedal and the z-bar is different too. If the bolt boss isn't threaded on the V8, I've drilled them and tapped threads into the block before. There is a flat spot where the hole should be. Just center punch it and drill the hole. __________________ I'm on the Instagram- @Gearhead_Kevin

02-25-2005, 10:14 AM	#5
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	Hmmm mine has a bracket with the ball mounted on it that is right between the holes on my 350.In fact it bolts in both of them,one on each end __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

02-25-2005, 11:01 AM	#7
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	lol I thought I used a piece I didn't need.It was in the back of the truck when I got it. It was the only thing in the back of the truck __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

02-25-2005, 04:20 PM	#8
gr8scott51 Registered User Join Date: Mar 2003 Location: Bremerton, WA Posts: 1,839	You're probably the only one that did it right!! __________________ Silence is golden, duct tape is silver. - Scott

02-25-2005, 06:29 PM	#9
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	zbar? Do I need one off a truck or any car V8? This isn't clearing things up(muddy).

03-03-2005, 12:29 PM	#10
stickshift_or_walk Left Foot Functioning Join Date: May 2004 Location: Duncan, OK Posts: 348	TTT for ya, and I'm confused as well. I understand that the V8 and I6 z-bar and rod are different, since I've seen reliable folks say so. But not knowing any better at the time, I used the stock setup when we changed I6 to smallblock (factory position). I had to move the frame bracket for the z-bar, mount the ball in the side of the block, and bend the rod slightly, but everything seems to work fine. Does anyone have pics of the different setups (I6 vs. V8 z-bar and pedal rod), or knowledge of why they are different? Is there some change in the mechanical advantage that would alter the travel or the force required? Thanks...SSOW __________________ 69 C10 (#1 son's ride) 72 C20 (Dad's farm truck) 82 K30 (Ex - brush pumper project)

03-03-2005, 02:04 PM	#11
1969K10 Senior Member Join Date: Jul 2004 Location: Clarks Hill, Indiana Posts: 733	Not an expert, but when I pulled the I-6 out of the '72 to swap in a V-8, I re-used the existing clutch Z-bar, bracktes, and pivot stud. Never had any problems with the clutch. __________________ 1969 K10 - V8, 465, 205, 12 bolt, D44 2002-current 1969 K20 - V8, 465, 221, Eaton, D44 2012-current Nothin' but drums on all 4 corners! past horses in the stable 72 C10-short step (97-02), 68 C10-long fleet (06-12)

03-03-2005, 02:12 PM	#12
davidh Senior Member Join Date: Feb 2004 Location: Ponca city now kingfisher Oklahoma Posts: 1,221	to 1969 K10 Where did you mount your motor? In the existing holes for the 6cy or did you move the stands?

03-03-2005, 02:02 PM	#13
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	I just did this when I swapped my 350 over to an inline. It was a step in the right direction. The pedal to z bar rod is straight on an inline engine and offset for the V8 engine. It's quite noticeable when you lay them next to each other, several inch offset. __________________ I'm on the Instagram- @Gearhead_Kevin



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