doright

I've inherited a 1986 Formula 357SR1 with the Kaama package. The engines are carbed 502's. How can I tell if they are original and how old they are?

Doc

ursus

On the starboard side of the engine at the back, above the starter is a small riveted plate to the block with mercruiser serial #. It may also be on the carb cover but the carb cover could be from a dif engine so get the # off the block. Go to the Mercruiser web site and enter in the number it will tell you what kind/year/options etc the engine was delivered.

Gary Anderson

They're probably not original, 502s were not available until around 1990.
If they're Merc engines, you can check the block code. It's on the front of the block over the timing cover or under the right cylinder head.
Gary

Crazyhorse

You've got great big engines. If they run when you turn the key you've got great big noisy engines.

Gary Anderson

I guess I know how Crazyhorse got over 2000 posts.
He is right though.
BTW doright, How do you know they're 502s and not 454s?
Gary

Ran-Dom 32

I tried the Mercruiser web site - Now I'm curious as to what year /model I have my block tag is OK283086 if I enter this it does give me much info besides parts list. Anyone know how to determine the year???

Ran-Dom 32

How do you tell what year bravo drive's are OL174481????

doright

I don't know for sure that they are 502's. I took the boat to a racing engine builder and he told me they were. I had thought they were 454's.

Rambunctious

ttt


what are the obvious difference at a 5 second glance between a 454 block and a 502 block.....

starter location? fuel pump mounting? waterpump? etc


just a curious bystander,,,,

GregP

Check the casting numbers (back of block top of bell housing) against the list at www.mortec.com

-Greg