Hi Fred. Thanks for the reply. This is a 1983 42 Ocean 671-JT Turbo rated at 450hp I usually cruise at 2000 rpm. I have owned the boat for over 10...
671-JT cyl specs Thanks for the info. I'm now rebuilding the engine and trying to get the best results. In your opinion, would installing the...
Can Anyone guide me in selecting the proper cyl ratio 17:1, 18:1, 19:1 for Detroit 671-JT engines. I have been getting different answers. I have...