blue thunder

You should be able to rule out cracked head/block then so that is good. I believe I would do a compression test on 1 and 3 to make sure there isn't another issue there.

FIXX

iTrader: (2)

From what i remember the bowtie blocks were not gen V they were mark blocks..

what year is your boat or engine.. if its a bowtie block it would have the chevy emblun caster on the side of it..

the 17249 is a upper end gasket kit for a gen v engine..

Do you remember if the lower water jackets in the heads were a diamond shape ?

Donman

The boat and engine are 1991. Yes, there is a "bowtie" cast into the side of the block.
I am a dumbass and cannot remember if the holes were round or diamond shaped.
The label on the box said it worked for "502 Bowtie".

I am now confused ..................

FIXX

iTrader: (2)

just remove the valve cover and look for a casting number,i think the last 3 are 088 for gen v heads..or pull the casting number off the back of the block and check that one,,hate to say it but i think you used a gen v head gaskets instead of the mark VI gaskets..

read this,,it reads yes and no on the gaskets you used???

http://www.marinemechanic.com/site/page173.html
Save yourself the felpro headaches,,call bob at performance gaskets,he will steer uoi in the rite direction and will get you the rite gaskets..262-677-4830..way cheaper too.

blue thunder

[QUOTE=mrfixxall;3464939] i think you used a gen v head gaskets instead of the mark VI gaskets..


You mean Mark IV gaskets right?

Donman

I have 088 heads.


I may be wrong but I thought there is no such thing as a Mark IV 502. ?

FIXX

iTrader: (2)

yes but you mentioned bowtie which is a 10.200 tall deck which made me believe you had this..scroll down to P/N 12370834


http://www.crateenginesonly.com/Chev...tie4250td.html

check the casting number on the back of the block and find out forsure what you have..

check the side of the block by the motor mounts,,if theirs a 8.2 then its just a standard 502 gen V block..

Donman

I checked the block casting #

10051107

...which is a Mark IV 454 Bowtie block

So ------ there`s my problem.

Donman

It`s a siamese-cylinder 4.25 bore block that is bored to 4.50".

FIXX

iTrader: (2)

you mean 4.470 lol 4.50 would make it a 509

call that number i gave you (post 24),,save the scratch,bob is a great guy to deal with..