75 monza 2+2 factory pulleys

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Re: 75 monza 2+2 factory pulleys

Postby Frosty92 » Sun Feb 18, 2018 8:21 pm

Frosty92 wrote:
Smiley wrote:What water pump pulley and crank pulley did you find at Summit ?[/quote

As soon as i get in to my laptop i have the numbers noted
Frosty


Here is what i found but no one can tell me if it has a 3/4 pilot hole in the water pump pulley. I guess at that price i can drill it out if they line up okay. or send them back.

https://www.summitracing.com/parts/aaf-all31080
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Re: 75 monza 2+2 factory pulleys

Postby cjbiagi » Sun Feb 18, 2018 8:43 pm

Unless it is specifically for a corvette it is going to have a 5/8” hole.
Clyde.........75 Monza 2+2
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Re: 75 monza 2+2 factory pulleys

Postby Smiley » Mon Feb 19, 2018 2:28 am

That is a 2 groove set with a 1:1 ratio and a 5/8 pilot hole.
You should use factory V8 Monza pulleys or 76 Corvette pulleys, 1:1.25 overdrive ratio, 3/4" pilot and the option to add the 3rd groove to the crank.
Most chrome pulleys are 1:1 and most aluminum pulleys are 1:1 or underdrive- not what you need for a street car with AC and a small radiator.

Note the difference in diameter from the waterpump pulley on top to the crank and add-on pulleys at the bottom.
s-l225.jpg
s-l225.jpg (18.82 KiB) Viewed 374 times
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Re: 75 monza 2+2 factory pulleys

Postby cosvega76 » Mon Feb 19, 2018 9:35 am

As Smiley said, with the marginal radiator size on and H-body, overdriving the water pump is a good idea for the street. That's what GM did from the factory.


Chuck
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Re: 75 monza 2+2 factory pulleys

Postby Frosty92 » Mon Feb 19, 2018 12:59 pm

Smiley wrote:That is a 2 groove set with a 1:1 ratio and a 5/8 pilot hole.
You should use factory V8 Monza pulleys or 76 Corvette pulleys, 1:1.25 overdrive ratio, 3/4" pilot and the option to add the 3rd groove to the crank.
Most chrome pulleys are 1:1 and most aluminum pulleys are 1:1 or underdrive- not what you need for a street car with AC and a small radiator.

Note the difference in diameter from the waterpump pulley on top to the crank and add-on pulleys at the bottom.
s-l225.jpg


Now I just need to find them lol
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Re: 75 monza 2+2 factory pulleys

Postby Frosty92 » Tue Feb 20, 2018 8:22 pm

Okay so if i could get a clarification i am getting water pump pulley 360435
and the two piece lower in links.

https://www.ebay.com/itm/202183824979

https://www.ebay.com/itm/151919879621

Thanks for all your help
Frosty
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Re: 75 monza 2+2 factory pulleys

Postby Smiley » Tue Feb 20, 2018 9:33 pm

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Re: 75 monza 2+2 factory pulleys

Postby Frosty92 » Thu Mar 01, 2018 11:11 am

I ordered all my pulleys this morning
Thanks for all the help. \m/
Frosty
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Re: 75 monza 2+2 factory pulleys

Postby Frosty92 » Sat Mar 03, 2018 12:44 pm

Smiley wrote:https://www.ebay.com/itm/1964-80-Chevy-Crank-Shaft-Deep-Groove-Pulley-2-Groove-GM-3858533-/272666078864?vxp=mtr&hash=item3f7c2a2e90 $53 for the deep groove, free shipping
https://www.ebay.com/itm/1964-72-Chevy- ... 52002cb8fe add-on $69 free shipping


Okay so i got the pulleys today.
The 3751232 p/s pulley doesn't set flush inside the double groove pulley (3858533) I assume they should meet together flush or is there a gap between them.
I did notice that there is stamped GM-BB-RF I found one that had different letters than the RF. Have not been able to find it again. Could that be The difference.
The gap just doesn't seem like it should be there.
Thanks Again for all the help

Keith
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Re: 75 monza 2+2 factory pulleys

Postby monzaaddict » Sat Mar 03, 2018 8:48 pm

I believe the double groove pulley is deep and the other is standard . they can not be mixed. you need the standard double groove pulley.
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Re: 75 monza 2+2 factory pulleys

Postby Smiley » Mon Mar 05, 2018 6:43 pm

Smiley wrote:"3744043 crank - double groove, low perf V8

3751232 crank - PS drive insert single, low perf V8

the crank pulley is 2 piece, the 3751232 is the add-on 3 rd groove for power steering"


3744043 crank - double groove, low perf V8 uses the 3751232 is the add-on.
if you got it from The Parts Place inc they are brick and mortar store that sells on ebay as well,
give them a call they should exchange it.
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Re: 75 monza 2+2 factory pulleys

Postby MonzaRacer » Sun Mar 11, 2018 6:47 pm

I guess if your going for authentic look these ideas are fine but when I start assembling my 77 this spring I intend to use the LT1 hub and one of the balancers. Still working out WHICH height I want to use as there are three. The short one goes on the LT1 with crank trigger, the next one is pre-crank trigger and long one is for Caprice I believe. Or Fbody, I dont have my notes in front of me.
I have an LT1 intake which according to my research will bolt directly to my 461 double humps (202/160,screw in studs, cut for big springs) . My plan is to either machine the intake for a small cap distributor OR I may go ahead and build my DIS set up.
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Re: 75 monza 2+2 factory pulleys

Postby Smiley » Sun Mar 11, 2018 9:20 pm

Monza Racer, What year is your LT1/LT-1 ? mid 90's LT1's had reverse flow cooling so the heads are different than LT-1's from the 70's.
I would not put 461 heads on a gen 2 LT1 block. The head bolts will line up but cooling passages are wrong.
The 5.7 Vortec blocks in 1996 -2000 trucks have the normal old style water pump and cooling passages.
Last edited by Smiley on Thu Mar 15, 2018 7:52 pm, edited 1 time in total.
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Re: 75 monza 2+2 factory pulleys

Postby Frosty92 » Thu Mar 15, 2018 11:39 am

Got all my pulleys and everything lines up great now.
Thanks for all the help \m/
Keith
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