What kind of engines do I have?
 

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

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.

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

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

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

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???

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

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.

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,,,,;)

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

-Greg

does it have provisions for a mechanical fuel pump?

They are either the 370 or the 420 from merc that was based off the 454. That is what Formula used with the Kaama package

Did you try www.mercruiserparts.com ????

Go to the look up parts by engine section then go to V8 sterndrives and look at the serial #s listed.
If its a 502 then its a 1996. If its a 454 then its 1996-1997.

1996 -1998 for that serial #.

Thanks Griff for your help - now I know my engine/drives are at least same or newer than the boat. (it was repowered)