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View Full Version : Porting a Merc 300.


Schiada
10-26-2012, 05:50 PM
After reading Mr. Brinkman's book I took it out on a Merc 300. We will see if it will work on this hotrod motor? Couldn't do all the work because the 300 doesn't have all the room that is needed. She has the 5/8" ports. So what do you think? My mill is old and so am I! LOL
Randy

50896

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Tim Kurcz
10-27-2012, 05:32 AM
Looks good so far. You can save alot of hand work by milling bridges for & aft. Just be careful not to narrow them. Also it may be too late, but you don't want to raise ports unless an H leg or stacks are used.

Tim
Mark75H
10-27-2012, 09:46 AM
I agree
Schiada
10-27-2012, 08:49 PM
Thank you very much!
I am trying to learn from all of you masters. Will be fun to see how well it go's.
Randy
Fastjeff57
10-28-2012, 04:24 AM
While you're at it, how about adding a divider to the exhaust? The later Mercs (and, ironically, the first 40 cubers) had them.

Jeff
Schiada
10-28-2012, 08:54 AM
50921
Been thinking about that? Looking at the 40H I have been thinking maybe it could be built into the exhaust cover?
Going to work on that.
Fastjeff57
10-28-2012, 01:27 PM
Why not? Did that witha Merc 200 a few years back.

Jeff
zul8tr
10-29-2012, 06:05 AM
What differences did you get with the Merc 200 by dividing the exhaust at the plate? Did you do anything for the exhaust in the tower?
curbman
10-29-2012, 07:36 AM
bye
merc69
01-26-2013, 06:03 AM
......... and it works......
Aeroliner
01-26-2013, 07:12 AM
The work looks good. Stacks will help a great deal if you want to run them. An old Quincy set might be fun to play with. For the folks that have not looked at the 40-H we made into a 44 you might enjoy following through this thread.

http://www.boatracingfacts.com/forums/showthread.php?6393-Mercury-Mark-40-H/page3


Alan