Some imput wanted. I have a pair of Merc 800sc's with under 90 hours in my 95 Skater. They are original and have never been apart, they still have the seals on the intake bolts. I am thinking of replacing the valve spings this year just as routine maintance. I would probably use Isky 8005-A with their retainers and locks. Who has a set of these 800's, and how many hours are they good for, valve train, blowers,ect? Thanks, Paul

Paul, you may want to change the lifters. I think you can do that without removing the intake.

HOW

yep the lifters are more likly to fail than springs,,please use the isky lifters there tough ,Troy Dennis and alot of builders have switched to them and isky springs

its easy to get lifters out ,blowers will last several hundred hrs,

Griff, on a lot of these BB heads, there are openings that will allow you to drop in a "hook" and pull the lifters out by their tie bar and reinstall them the same way. Most people fashion a few out of hanger size wire. Its a PITA but easier that pulling the blower, manifold etc. and reinstalling same.

my 800s 150 hours. change oil every 15 hours and what ever you do keep merc spec. remember them the people with plastic warrenty cards.

cya lucy.

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I want Lucy to help me work on MY engines.
I routinely drop fasteners and small parts (bolts and nuts) in the bilge and my big arms won't fit between the hardware to reach them.

I bet LUCY could bend over right there and reach those nuts. She might have to give a little wiggle, though, to get them to come out.

I'd even buy her lunch.

helping other boaters is what i do my shop is your shop. cya LUCY

Shawn, wow, I had no idea any heads were made like that. Makes a lot of sense and would save a lot of time on engines with high lift cams.