LT1 Carb conversion question
Thread Starter
Teching In
Joined: Jun 2014
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From: Conroe, TX
LT1 Carb conversion question I'm doing an LT1 carb conversion and had a weird question. When you remove the water pump drive gear (For electric water pump) what do you do with that hole and the holes on each side of it? Am I supposed to close those up or what? These holes are on the block and are an opening to underneath the intake. Any help would be appreciated.
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you use the stock WP "housing" for the EWP. You can either just leave the wp drive gear in or remove it and plug the Timing Cover hole. some use a freeze plug or even a coin (peso) that fits
for the Opti hole, GM makes a cover plate for that with a timing mark
for the Opti hole, GM makes a cover plate for that with a timing mark
Thread Starter
Teching In
Joined: Jun 2014
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From: Conroe, TX
So what are those two holes for (One on the left and one on the right) of the waterpump drive gear?
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Joined: Apr 2008
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no, I have a LT1 on the stand so just looked at mine
this motor is going in a 70 Nova w/carb. I got the GMPP intake and Opti block off plate. I will be running a stock WP so keeping the WP drive gear. On my 383 I have EWP but still have the drive gear on. Been that way for 16 years
the 2 oil galley plugs that have the pin holes in them, IIRC, are there to oil the timing chain
this motor is going in a 70 Nova w/carb. I got the GMPP intake and Opti block off plate. I will be running a stock WP so keeping the WP drive gear. On my 383 I have EWP but still have the drive gear on. Been that way for 16 years
the 2 oil galley plugs that have the pin holes in them, IIRC, are there to oil the timing chain
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Thread Starter
Teching In
Joined: Jun 2014
Posts: 35
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From: Conroe, TX
no, I have a LT1 on the stand so just looked at mine
this motor is going in a 70 Nova w/carb. I got the GMPP intake and Opti block off plate. I will be running a stock WP so keeping the WP drive gear. On my 383 I have EWP but still have the drive gear on. Been that way for 16 years
the 2 oil galley plugs that have the pin holes in them, IIRC, are there to oil the timing chain
this motor is going in a 70 Nova w/carb. I got the GMPP intake and Opti block off plate. I will be running a stock WP so keeping the WP drive gear. On my 383 I have EWP but still have the drive gear on. Been that way for 16 years
the 2 oil galley plugs that have the pin holes in them, IIRC, are there to oil the timing chain
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Teching In
Joined: Jun 2014
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From: Conroe, TX
Another quick question. I'm about to buy a timing cover. What is the reason behind having a 1997 timing cover over a previous model. The only difference I've seen was the bigger hole in the center but I thought I had seen on another thread that the previous models could work now. Can anyone clarify exactly which one I need and why?
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Joined: Apr 2008
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depending on what year LT1 motor you have. There were 3 different TC's for the Gen 2 LT1. If you have a 96-7 that uses a CPS you need that one. Also the Damper hub is shorter for the 96-97
Mine in in a 70 so I don't use/need a CPS. Non computer controlled motor now
Mine in in a 70 so I don't use/need a CPS. Non computer controlled motor now
The two holes you are referring to are oil drain holes. The allow oil to flow out of the valley and lubricate the timing set. plugging them won't allow oil to drain back to the pan, unless it goes through the holes in the valley to the camshaft. Usually people smooth them out, so the oil flows nicely down to the pan via the timing set. Don't plug them.....