LT1 Crankcase Vacuum Pump Kit in Development
Thread Starter
Joined: Oct 2005
Posts: 1,687
Likes: 0
From: Fairfax, Virginia
What he is saying is, even without a vacuum pump, you should not have oil pressurizing out of all those seals. Assuming you at least have the stock PCV system or breathers off the valve covers, you shouldn't have the pressure your getting. Yes a vac pump could help, but make sure your engine is up to par first. My last motor was machined poorly by a shop and I had all kinds of blow by.
Thanks I really hope that is not the case. The car has the stock PCV system still. Would running breathers help? I am also going to double check my PCV system and probably put a new PCV valve in just to see id it makes a difference .
From the dead.
I used this setup and it works perfect! I put the pump where the AC was and left the Alt in the stock location. Everything fits like factory.
All of the lines went on without any issue and I used all 12AN parts. I was able to use the stock length belt and tensioner. I will have to take a few pictures tonight and host them up. I wish I would have taken a few before I put it all together. The pump is almost invisible down there...
I didnt change the Balancer as the cost to change it and all of the blower parts really outweighed the cost if this pump fails. I have a $1000 cog drive set up I could give crap if a $300 pump fails Ill just buy another or have it fixed. I spoke to GZ and they said it should hold up find even spinning it to almost 7k rpms. If the Pump fails it is max $150 to rebuild it plush shipping.
I used this setup and it works perfect! I put the pump where the AC was and left the Alt in the stock location. Everything fits like factory.
All of the lines went on without any issue and I used all 12AN parts. I was able to use the stock length belt and tensioner. I will have to take a few pictures tonight and host them up. I wish I would have taken a few before I put it all together. The pump is almost invisible down there...
I didnt change the Balancer as the cost to change it and all of the blower parts really outweighed the cost if this pump fails. I have a $1000 cog drive set up I could give crap if a $300 pump fails Ill just buy another or have it fixed. I spoke to GZ and they said it should hold up find even spinning it to almost 7k rpms. If the Pump fails it is max $150 to rebuild it plush shipping.
Last edited by ramair96ws6; Nov 28, 2012 at 04:04 PM.
From the dead.
I used this setup and it works perfect! I put the pump where the AC was and left the Alt in the stock location. Everything fits like factory.
All of the lines went on without any issue and I used all 12AN parts. I was able to use the stock length belt and tensioner. I will have to take a few pictures tonight and host them up. I wish I would have taken a few before I put it all together. The pump is almost invisible down there...
I didnt change the Balancer as the cost to change it and all of the blower parts really outweighed the cost if this pump fails. I have a $1000 cog drive set up I could give crap if a $300 pump fails Ill just buy another or have it fixed. I spoke to GZ and they said it should hold up find even spinning it to almost 7k rpms. If the Pump fails it is max $150 to rebuild it plush shipping.
I used this setup and it works perfect! I put the pump where the AC was and left the Alt in the stock location. Everything fits like factory.
All of the lines went on without any issue and I used all 12AN parts. I was able to use the stock length belt and tensioner. I will have to take a few pictures tonight and host them up. I wish I would have taken a few before I put it all together. The pump is almost invisible down there...
I didnt change the Balancer as the cost to change it and all of the blower parts really outweighed the cost if this pump fails. I have a $1000 cog drive set up I could give crap if a $300 pump fails Ill just buy another or have it fixed. I spoke to GZ and they said it should hold up find even spinning it to almost 7k rpms. If the Pump fails it is max $150 to rebuild it plush shipping.
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Staging Lane
Joined: Jan 2012
Posts: 50
Likes: 0
Here are the parts that I used.
-GZ Motorsports Vacuum pump (VP101A)
-Dorman 5.69" vacuum pump pulley from local parts store (300-912)
-Custom vacuum pump bracket
-ASP 5.7" crankshaft balancer (ASP945100)
-ASP smaller alternator pulley
-Custom alternator bracket
-Stock length serpentine belt
-Star Machine -12AN Female vacuum regulator
-Star Machine -10AN fitting w/ baffle for valve cover
-Moroso breather tank (85402)
-GZ Motorsports Vacuum pump (VP101A)
-Dorman 5.69" vacuum pump pulley from local parts store (300-912)
-Custom vacuum pump bracket
-ASP 5.7" crankshaft balancer (ASP945100)
-ASP smaller alternator pulley
-Custom alternator bracket
-Stock length serpentine belt
-Star Machine -12AN Female vacuum regulator
-Star Machine -10AN fitting w/ baffle for valve cover
-Moroso breather tank (85402)
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Thread Starter
Joined: Oct 2005
Posts: 1,687
Likes: 0
From: Fairfax, Virginia
A larger vacuum pump pulley will not physically fit with this configuration. Ask ramair96ws6 what size his crank pulley is. He kept his larger and GZ says it will be ok. However, they do make underdrive pulleys that go between your existing hub and dampener.