Hey all, Since we purchased our 340DA last October, I've always gotten different water pressure readings as well as temps from both engines. Port engine runs slightly warmer than starboard and has a significantly lower water pressure though neither engine is anywhere near overheating. (I've swapped out sensors and checked temps at the manifolds to verify this). In any case, seeing as I have no idea how old the current manifolds on the boat are (I can only assume they are original as well as water pumps), figured what's the harm in replacing everything other than a dent in my wallet. At least my wallet won't be emptied from having to re-power due to a manifold failure. Anyway, hopefully this will address the discrepancies once and for all, and at the very least it will put my manifolds and water pumps at "zero" for my peace of mind as we embark on some serious cruising this upcoming season. Now after making this decision, I went to a mechanic that a friend of mine recommended and asked him to give me a quote. New manifolds and water pumps on both engines installed were going to run me in the neighbourhood of $8000CAD. $1000 per manifold "set" and $1000 for each water pump=$6000 for parts alone. Now me being the somewhat thrifty guy I am, decided that was crazy and went ahead and did some research on my own. I ended up buying 4 manifold sets from Michigan Motorz, and 2 water pumps at wholesale from a distributor up here. Total cost to me: $3300CAD. A significant savings. Everything should arrive Monday, and I plan to do the install myself next Thursday. Having been a boater for around 3 years, I've yet to find a truly honest mechanic. (no offense mechanics ...maybe it's where I live) And so I continue to learn and teach myself how to work on my boat which I continue to find very rewarding. It's not easy and can be more time consuming ...but I find if I take it step by step and go slow, I can usually get the job done barring an engine rebuild or something more major like that. Anyway just wanted to share, and I'll let you know how the install goes ...and if it solves the pressure and temp discrepancies.