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Yes that is very helpful! The new pump is a DB2-4544. Isn’t that a 6.5 pump? Old pump is a DB2-2829. I just replaced the leaking rubber O rings on the throttle. No loss in the coolant levels.

The thing is... How is it a custom built ip has to be advanced so much to get it to run decent? What would I have to do internally to fix the advancement?

I did not have a shop check the heads. The motor has 23,000 orig miles on it. I installed ARP Head Studs with the Arp thread sealer., Honestly I think it is the IP. I will replace it with the old one once I replace the throttle Seal.

I did put this new ip on a different 6.2 and still had the same issues and ended up putting the old ip back on and the motor had no issues. I do not think it is a coolant leak because I did new head gaskets as well. I will test the cold advance. Other ideas?

Hello! I bought a custom built DB2 IP from Badgerdiesel eBay because the old ip was leaking from the throttle seal. I installed the new ip and the M1009 fired right up but ran rough with white smoke with the ip timing set mark to mark. I advanced the timing as far as I could and it runs a lot...