#1  
Old 09-27-2020, 10:28 PM
soupman soupman is offline
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Default Distance from block to power steering pulley

I posted this in the street section but no responses. I am looking to see if someone with a 68 car could measure from the front of the block, where water pump attaches, to the middle of the power steering pulley. I want to use the 67-69 power steering brackets, and need this dimension. Thanks

  #2  
Old 09-29-2020, 09:36 AM
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Are you having issues with your pulleys aligning?

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Old 09-29-2020, 12:00 PM
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Basically I moved the alternator to the passenger side, fits well there but I am using the first pulley groove (towards radiator) that is used by the power steering. Since I have the 11 bolt longer water pump, was hoping that the short bracket pulley setup from the 68 cars would work. If someone could measure from the block where the water pump bolts to, to the power steering Pulley would be helpful.


Last edited by soupman; 09-29-2020 at 12:02 PM. Reason: Info
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Old 09-30-2020, 02:21 AM
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So you are needing the measurement from an original 8 bolt '68 setup with the shorter water pump?
.

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Old 09-30-2020, 12:18 PM
'ol Pinion head 'ol Pinion head is offline
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Several things that stick out to me after reading prev responses:
The factory PS pump will locate an original '67-70 "900" or "901" PS pulley in the exact same position no matter if the water pump & timing cover are an 8bolt or a '69 & later 11 bolt. Whether a short pump or a '70 tall 11bolt pump, the factory '67-70 Pontiac PS pump setup locates the PS pulley in the exact same spot.

Last, if you want to initially line up a 60's 10DN (requires external regulator) or '70's 10SI alternator on the passenger side of a Pontiac V8, you could remove the original front alternator strap, & flip it over & bolt it to the mirror image bolt on the passenger side of the timing cover. The front alt strap is flat, & will position itself in the same plane. it would take some work to make a support bracket to swivel the alternator from a lower mount up to the strap, but it could be done. If no responses soon, will pull out an original '67-70 pump from stock, mount an original PS pulley & alum pivot block, & measure the dimension you are after.

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Old 09-30-2020, 05:31 PM
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I am using non a/c pulleys from A 73 car with 11 bolt water pump. I am using the late style alternator from the 80’s. Since the 11 bolt water pump is approximately 1/2” longer, was hoping the 67-70 power steering pulley would also be 1/2” closer to the block, unless the backspacing on the 1973 pulleys makes up that difference.

Greg- yes I need a measurement from a 67-70 power steering setup, preferably a 8 bolt pump. If you still have your 68 that would work.

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Old 09-30-2020, 06:07 PM
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I am using non a/c pulleys from A 73
=
game changer

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Old 09-30-2020, 07:58 PM
'ol Pinion head 'ol Pinion head is offline
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Measured several different mounted Pontiac V8 pumps:
- first, a '67 PS pump with all factory mtg pieces, pulley is a "900". From the face of the block/alum pivot block surface out to the centerline of the "900" pulley was 6.75"
- second, complete restored '72 pump & brackets for my '72 T/A. Face of block/mating point of the rear steel bracket to the centerline of the 481042 PS pulley, again 6.75"
-third, a Pontiac V8 pump setup off a '68 Bird I had. early ('67-70) style PS pump sandwiched between front & rear alternator brackets from a '71+ 10 SI alt/PS set. Still 6.75 inches.

As a result, with you planning some sort of alternator mtg on the passenger side, your '71+ pulleys should line up. Just going to be interesting what you come up with to mount the alternator. Makes me wonder whats in the way that neccistatitates mounting an alternator on the passenger side?

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Old 09-30-2020, 10:10 PM
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OPH, thanks for that information. I have a low sloping hood and leaving the alternator in stock location catches the hood. I will take some pictures tomorrow.

I measured my engine and from the block face where the water pumps mounts to the first pulley groove is 5” and the second pulley groove is 5.75”. I believe I have the 037 and 039 pulleys, but our dimensions are off by 1 inch.

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Old 09-30-2020, 10:48 PM
PurelyGTO68 PurelyGTO68 is offline
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Quote:
Originally Posted by soupman View Post
OPH, thanks for that information. I have a low sloping hood and leaving the alternator in stock location catches the hood. I will take some pictures tomorrow.

I measured my engine and from the block face where the water pumps mounts to the first pulley groove is 5” and the second pulley groove is 5.75”. I believe I have the 037 and 039 pulleys, but our dimensions are off by 1 inch.
Your water pump mounts to the engine block?

  #11  
Old 09-30-2020, 10:52 PM
PurelyGTO68 PurelyGTO68 is offline
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Front of block to center of power steering pump pulley is 5 3/8"

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Old 09-30-2020, 11:04 PM
PurelyGTO68 PurelyGTO68 is offline
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Correction. Block to center of power steering pulley is 5 7/16"
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  #13  
Old 10-01-2020, 01:35 AM
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Sorry soupman, I changed to an 11 bolt pump so that's not going to help you any.

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Old 10-01-2020, 04:25 AM
'ol Pinion head 'ol Pinion head is offline
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Quote:
Originally Posted by PurelyGTO68 View Post
Correction. Block to center of power steering pulley is 5 7/16"
Yes, that is correct distance to passenger side head face/machined block face. my previous measurements were from the stock position, front of the drivers side head. With the drivers side head setting back further on the block, the distance is 1 5/16" longer.

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Old 10-01-2020, 04:31 AM
'ol Pinion head 'ol Pinion head is offline
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Quote:
Originally Posted by Greg Reid View Post
Sorry soupman, I changed to an 11 bolt pump so that's not going to help you any.
Greg, an 8 bolt or 11 bolt won't matter as far as the stock positioning of the center of the PS pulley, as same power steering setup was used from '67-70 with 3 different style timing covers & 3 different style water pumps. All of the water pump pulley alignment came down to the use of specific wp pulleys to fit with each style timing cover & water pump.

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  #16  
Old 10-01-2020, 04:34 AM
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Yeah, you're right oph. I didn't think about that. Water pump is still in the same place.

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  #17  
Old 10-01-2020, 09:17 AM
soupman soupman is offline
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PurelyGTO- thanks for that dimension!

Looks like the difference is as OPH says and in the pulleys backspacing.
I want to use the 67-70 power steering brackets to catch that second groove, but looks like they would protrude about 7/16” to far. May have to make a custom brackets.....
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  #18  
Old 10-01-2020, 04:22 PM
PurelyGTO68 PurelyGTO68 is offline
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Quote:
Originally Posted by 'ol Pinion head View Post
Yes, that is correct distance to passenger side head face/machined block face. my previous measurements were from the stock position, front of the drivers side head. With the drivers side head setting back further on the block, the distance is 1 5/16" longer.
Agreed. That is why I added the photo. I wasn't able to get good access to the LH side of the engine block. Hopefully this info helps out the OP well enough to resolve his dilemma.

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