Mercury 2.5 block id

**kjdoo4** · 01-03-2020, 08:23 PM

Can someone tell me what a 2.5 block stamp pp stands for? I know someone had a chart identifying all the performance blocks but I cant find it again. Thanks

**patchesII** · 01-03-2020, 08:26 PM

PP was a 260

**Kennay** · 01-03-2020, 08:26 PM

edit. misread.

**patchesII** · 01-03-2020, 08:29 PM

EE were the early 2.5 200’s with the small exhaust chest

**kjdoo4** · 01-03-2020, 08:34 PM

How about a block stamped kk. I have two blocks that im trying to figure it out

**patchesII** · 01-03-2020, 08:44 PM

You got me on that one. Never heard of a KK

**roadkill636** · 01-03-2020, 08:52 PM

Just last week

**PaulR** · 01-03-2020, 09:19 PM

Kjdoo4 was asking because of this crazy motor I picked up. Not sure what it is? Its a big bore with 3.640 bores with weird o-ring steel sleeves.

**kjdoo4** · 01-03-2020, 09:53 PM

Thank you for all the help guys. That was the image i remember roadkill.

**tlwjkw** · 01-04-2020, 04:21 AM

wow!.. someone was really gettin' serious with that one...………

maybe for tha BIG pills.

**patchesII** · 01-04-2020, 08:26 AM

Looks like something Alex Hledin did years back. I know he built some big bore bridgeports with that bore diameter

**Merc 2.5** · 01-04-2020, 08:30 AM

Looks like sumone was building there own custom merc. Which 2.5 had Bridgeport exhaust if any ? And o ring ??

**tlwjkw** · 01-04-2020, 11:38 AM

looks like based off 2.5 with dowel pin, off chambered heads, 2.5 style pistons?.. only 2.5 I've seen was a "Z" port.. but with tha guy Eric mentioned it aint no tellin'...

**patchesII** · 01-04-2020, 11:57 AM

Originally Posted by Merc 2.5

Looks like sumone was building there own custom merc. Which 2.5 had Bridgeport exhaust if any ? And o ring ??

If I’m right about it’s origin it’s a 260 block that Alex added the bridges to and used an OMC based piston. They made big power but the bridge was obviously prone to overheating. I always wanted to try one with methanol, way less likely to get hot enough to distort