I noticed a small difference in the identifying numbers. Which pump do you suggest that I use?

 

there is a date stamp on the left of the part number in the circle. the bottom one seams to be of a 00 build date, which means it was probably in a 2001 motor. the 01-02 pumps were revised and better.

just curious, why are you using a used pump? there is no way to verify miles on them.

 

It's a good thing you notified me of the build date. I was planning on reusing the pump to save some money if the pump was in good condition. I suspected that one of the two engines i had was rebuilt recently, but i guess it wasn't a full rebuild.

what pump do you recommend for a 400whp all motor build with maybe a small shot of direct port nitrous way further down the road?

 

TSP Ported ls6

 

LOVE THIS PUMP. i have this one, at cold idle i have 70psi, and at hot idle, i have between 50-60psi, and up to 70psi above 2k rpms. so if you can afford to shell out $150 then this is the pump for you, otherwise use the 2000 build date one (the bottom pic)
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btw while you are in there, throw an LS2 timing chain in there

 

Sounds good guys. I'll take your advice on that. Thanks for the help.

regarding the timing chain, I've been doing a lot of research on whether or not to go with double or a single chain. Why would i want to go with the ls2 single if for the same price i can go with the double?

I guess i should also note that the engine is currently going through a rebuild (which I'm doing myself), and every corner i can cut in buying parts means the engine will be ready to drop into my car that much sooner. Any help appreciated.

 

Rock-Auto parts ,,,,,,,,,,,LS2 timing set $28-30 ,,,,Cloyes . To use a dbl roller chain You have to shim the oil pump and most poeple on here don't want to do that ,,,,,,,sometimes clearance issues ,,,,,,,blah blah