TylerSteez

iTrader: (3)

Hey guys, just picked up my 383 stroker from the engine builder. I went with a l31 vortec block which doesn't have the internal coolant bypass.

Since Im going serpentine I couldn't use my v belt stuff from the old engine and my brother had a brand new water pump for his 92 Camaro RS sitting on the shelf so I planned on using that until I saw that it has the hole for the coolant bypass. What year water pump doesn't have the internal bypass? I need to get this engine sealed up because my garage has a few furry friends creeping around in the night. thanks

edit: should I just tap the bypass hole on the 92 pump and use a set screw with thread sealant?

Abubaca

iTrader: (3)

That hole isn't threaded already??? Yeah, just plug it.

Abubaca

iTrader: (3)

Ahhhhh....ok, I get what you're saying about the L31 block. I would think you could just tap and plug, but that's not something I've done. Water pumps are too expensive....sure you could get another without that hole

TylerSteez

iTrader: (3)

Pretty sure all thirdgen factory waterpumps have that internal bypass hole, buying an aftermarket pump seems like a large risk that it won't line up correctly with the thirdgen serp set up.

I ended up just bolting it to the block with the gaskets and sealant because it appears that it will work fine without plugging the hole. I'll update the thread when I finally get it running, thanks for the help

KCG

iTrader: (1)

Did you get this going yet? Just wondered how that worked out...thinking about the L31 swap also

midias

Did you add an external bypass?

TylerSteez

iTrader: (3)

From what I’ve read, connecting the heater core hose to the top port of the water pump without the coolant bypass valve will act as a n external bypass, if I run into any issues with that then I do have an unused port on my intake manifold that I could use as well.

TylerSteez

iTrader: (3)

Engine is still out of the car. I’m taking my time, saving up money, and doing things as best as I can. If you’re wondering about the water pump issue then I believe that I have that all figured out, see the post above this one for that info.

midias

With the heater core hooked up you should be 100% good to go