Mark 28 Powerhead

[daveee]

Is this powerhead any good for B class engines?
Any parts within good for ???
Thanks
Dave

[seanp3]

I don't think so. Just a lake runner

[valdjr]

28 P-head

I'm restoring a mk28 could use some parts if you decide to sell, Val 518-399-3342

[Mike45]

I believe you can race this in AMOD as long as you have it on a "quickie" or a "quiet tower".

[hydroid]

Daveee, ...hmmmm,...what's cooking now at skunkworks?
I have 2 Mark 28 22ci powerheads, and a couple of KG4H towers ready to be rat rodded.

[Mike45]

I'll check again with my team mate (50y of racing) but I think he said as long as the powerhead remains stock you can put it on a race lower unit and run it in AMOD. (I think it is now called 250ccm.)

I'll get back to you asap.

I just hate to see these go to a scrap yard or on someones shelf because the old merc's are still a competative motor in this class. I'm doing some work on two of them right now to run this year.
Contact me if you are dead set on not running them.

[STEVE FRENCH]

Lagal A-MOD on a "quickee" A/B KG4-7H+20H tower.....and 25 MOD with a megaphone!.....Still have my first 25MOD Mark-28 power head (with original fact seal!) and it is ready ta race if my side cover/filler block ever find there way home/replaced...................(Hi Fastjack/Shawn?)...............LOL!!!!

[johnsonm50]

Does the MK 28 crankshaft fit an AB? Ive heard they come up a little short & only engage about a 1/4" of spline.

[STEVE FRENCH]

The early 22 cube Mark-28's fit fine.....The newer 200/25SS style powerheads have a water plate and require a longer shaft (approx 1/4" like the 25SS).....all my gearfoots have a squared stub and I use a Snap-on deep 9/16" socket driven on and weld'd to a cut to lenghth nee'd shaft for dif length applications need'd.......But the "H"/"Q" shaft fits the early Mark-28's.............