[GTOWAGON]

does anyone know what the 2 holes are above the clutch fork opening are they for a htdraulic slave cylinder?? has anyone used a hydraulic slave or hyd throwout bearing on their OHC

[camerjeff]

Could you post some pic's of the bellhousing? The only holes I see on the 3 bellhousings I have are for the clutch fork. Now the Automatic Bellhousings had Cooling Holes for the air cooled Torque converter that they used to cool the trans Fluid. But Pic's would help.

[Jeff Hamlin]

Jeff I think he may be referring to the upper vents?

[TheSilverBuick]

I don't know for sure, but the BOP bellhousing on my Skylark has two threaded holes above (iirc) the clutch fork openning, and I think it's a later model bellhousing and the threaded holes were actually for a cable mounting. Like on the late 70's H-bodies (Buick Skyhawk, Olds Starfire, and Pontiac Astre\Sunbird).

[Cammer-6]

Originally Posted by TheSilverBuick

I don't know for sure, but the BOP bellhousing on my Skylark has two threaded holes above (iirc) the clutch fork openning, and I think it's a later model bellhousing and the threaded holes were actually for a cable mounting. Like on the late 70's H-bodies (Buick Skyhawk, Olds Starfire, and Pontiac Astre\Sunbird).

is the bolt pattern canted like the OHC-6 only one is?

[TheSilverBuick]

Didn't know there was a difference, why is the OHC canted? Or rather why would the OHC be canted and not the V8 one for the same vehicle?

[1967Tempest]

I think he is talking about the ones in the picture below directly above the fork. I too would like to know what this is for. I am doing a swap where there is gonna be a lot of fab work. The answer might help me decide.....

[GTOWAGON]

the last pic is showing the holes I an refering to here is a pic of mine

[TheSilverBuick]

That's definitely different than what I was thinking. Mine looks like this one, but this is just a googled image.

[Jeff Hamlin]

Sorry about that I focused on "Holes" and never even thought bolt holes
I know some of the old trucks used a Hyd setup do you think the OHC bell may have been used on any GMC 6 apps?

[camerjeff]

I had the Same Mental Block as Jeff H (must be a Jeff thing) I included a couple of shots of parts I have, the grubby one is a 67 3-speed Column Shift set up from a Tempest, and the other is from my 67 4-speed car. Both have the same bolt holes as the one you posted. I actually have no idea why they are there. I have never seen anything bolted to them.

Being in the Machine Automation Business I could suggest that they were possibly used in the Machining process to either hold a Fixture or secure the part for machining. That would be my best Guess, and it is only a Guess.

And I do see the resemblance to a cable operated H-body bellhousing, I have one of those also that is going into my 77 Astre Formula, but it only uses 1 small 3/8 bolt hole to secure a cover over the cable.

[GTOWAGON]

Originally Posted by Jeff Hamlin

Sorry about that I focused on "Holes" and never even thought bolt holes
I know some of the old trucks used a Hyd setup do you think the OHC bell may have been used on any GMC 6 apps?

thats what I thought as there are 2 starter pockets one on each side I am putting an OHC-6 in my 31 pontiac and think I might run a hydraulic clutch slave or throughout bearing and the slave might be the easiest way to go

[HO LEMANS]

I do not know what the original intended purpose for those holes are but I do know if an angled block is fabricated with holes to bolt it on with and a tapped hole in the middle for a clutch ball to screw into, it lines up almost perfectly for the clutch linkage in a 73' GMC 1/2 ton 4WD (with a Pontiac 400 of course) and considering they used the Pontiac in the 57' GMC pickups maybe it does have something to do with the clutch and they just left them in on the OHC bells don't know just a thought

[Cammer-6]

I dont think any of the early trucks used an aluminum bellhousing,also used the mount as part of bellhousing not trans tail shaft.

[importsmasher]

If I remember correctly, someone once told me those holes were for a bracket that was used to hold the Z bar pivot ball on 65-70 full size cars (the pivot apparently doesn't screw into the hole in the block on FS cars). I could be wrong, however.....
Importsmasher

[camerjeff]

Well that is in the realm of possibility, now that you mention Full Size B-bodies, it stirs some old memories. Mac McKeller and I had a conversation about 20 years ago about hois work on the OHC-6 and OHC V-8's. He said that they made about ten 370(I think that is the size he mentioned) CI OHC-6's to test as a possible base engine for the Catalina. He said that the engine worked well, but the cars were very slow, even with the stroked Crank Shaft the engines did not have enough low end Torque to get the cars Moving well. So the Idea was dropped.
I have never worked on a Manual 65-70 B-body, the only one I have owned was a 65 2+2 and it had an Automatic. Might have to ask the B-body guys.

[BMFH]

Hello All

Maybe that's where the Hydrocilator used to bolt onto the Bellhousing????

Anyone seen the Video?

Dusty

[marxjunk]

Originally Posted by importsmasher

If I remember correctly, someone once told me those holes were for a bracket that was used to hold the Z bar pivot ball on 65-70 full size cars (the pivot apparently doesn't screw into the hole in the block on FS cars). I could be wrong, however.....
Importsmasher

you are correct sir......

ive pulled a few big cars apart, and those holes hold a bracket that the z-bar pivot bolts too...

i would think it was a vendor thing..all bells have them, and that would allow them to use them on anything..although OHC bells are unique..only 1 starter provision

[marxjunk]

heres a pic on my 66 executive

[GTO JOHN]

What is the part number of an OHC bellhousing? I think I picked one up recently.