Ported & Flowed 502 Mag square port heads...

[jrumon]

I have a KILLER set of factory Merc GM square port High-Perf heads that had $1000 of very high quality professional porting, flow work, and the chambers polished & cc matched. These were brand new Merc/GM castings before the porting and were run very little (under 25 hours) when pulled off motor and upgraded to Aluminum Darts and 8-71 Supercharger package.

These out-flowed Merlin Heads easily... Big power gains over stock... Photos available...
A great set of square port heads for $750 pair! (please note: these are bare castings)

Jim 734-261-4351
jrumon@yahoo.com

[jrumon]

I have a KILLER set of factory Merc GM square port High-Perf heads that had $1000 of very high quality professional porting, flow work, and the chambers polished & cc matched. These were brand new Merc/GM castings before the porting and were run very little (under 25 hours) when pulled off motor and upgraded to Aluminum Darts and 8-71 Supercharger package.

These out-flowed Merlin Heads easily... Big power gains over stock... Photos available...
A great set of square port heads for $750 pair! (please note: these are bare castings)

Jim 734-261-4351
jrumon@yahoo.com

[convincor242]

Hello name is Mike looking for heads need a little more information live in GR MI #6162996793

[jrumon]

Mike...call me is best. They are available. Jim.

[jrumon]

Still available....

[fnshrmaster]

Jim,would these heads perform better than my current ones?Would they require headers first to get the maximum potential from them?Talk to me Mr.Motorhead!You da man Jimbo! http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/biggthumpup.gif

[jrumon]

Kurt... These are a killer set of bare heads and YES, they would require headers to take advantage of the flow work! they are AVAILABLE...

[fnshrmaster]

Jim,how firm are you on the price?

[fnshrmaster]

By the way Jim,I envy you for the summer off.I get WINTERS off! http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/zx11pissed.gifAll my guys that work for me have sleds.they have pressured me 4 years to get one.I hate the cold!Ill take a nice surround system and a big screen tv before I buy one of those darn snowmobile thingamajigys.I like to ride them once in a while,if I dont have to make the payment and feed them parts.So.......enjoy your job,its too cool! http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/thumb.gif

[fnshrmaster]

Is that a pic of your place in the avatar?Nice!Where are you at?We have a place on Hamlin Lake in Ludington.Its right at the north bayou,if you have ever been on hamlin,its a big lake.We love it and miss it already.Summer is just too short!

[boatn70]

i'll race you now fnshrmstr,

jim, do you have any flow bench numbers on those heads??

[fnshrmaster]

Got some work to do b 4 I run you Kevin!My boats a loaded down barge.I wish it didnt have all the amenities,I dont need em nor will I use em.Getting rid of weight is as good as buying hp.

[boatn70]

not racing the boats, i was refering to racing to buy those heads from jrumon!!!

but a boat race sounds good too!!!!!

[fnshrmaster]

Go for it.

[fnshrmaster]

Well kevin.....did you get your heads?

[jrumon]

Heads are still available!!

Fnshrmaster... My cottage is on Lake Huron... in the thumb of Michigan 6 miles NE of Caseville. GREAT PLACE to enjoy the family, boats, and beach (although maintainance & taxes suck)!!! Glad it's only 2-1/2 hours away from home...we spend the majority of June, July and August up there and worth every penny!!!!!!!!! I just need a CHECKMATE again... http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/brickwall.gif

boatn70...and...fnshrmaster...HEADS ARE AVAILABLE... $750 or MAKE OFFER! I am going to shoot photos of them (If I can get a clear close-up detail shot)...I can e-mail them if interested (photos that is)...

P.S. Kurt, I can hook you up with a 540ci supercharged motor (1000+hp) for that 25' GTX...then you can go have some mph fun! http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/surf.gif

[fnshrmaster]

Sent you mail Jim.I probably will need that motor against Kevin,he too is a speed nut and leaves nothing stock.I believe his motto is "Never fast enough"Kinda like you Jim. http://www.checkmate-boats.com/infopop/emoticons/icon_biggrin.gif

[boatn70]

jim,
got any flow numbers on those heads?

[jrumon]

Sorry, I forgot to answer that on flow numbers.... The guy who had the heads done did at the time I built his motor... but I gave him everything back when the job was done and will have to see if he kept any of if (but I highly dought it).... http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/jpshakehead.gif

If it's any indication of the quality... these heads were brand new casting prior to dropping over $1000 on professional port & flow work... Then another $1000 on the best valves, springs, retainers, and correct set-up. These are SUPER-SWEET heads...he just switched to hugh dollar aluminum ones when I supercharged/innercooled it (he has money to burn)!!!

[jrumon]

P.S. The only reason he went to the aluminum heads instead of these was better heat disapation with the supercharger and running pump gas at higher boost levels. There is nothing wrong with these, they were just up-graded for the SC application! http://www.checkmate-boats.com/infopop/emoticons/icon_razz.gif

[boatn70]

thanks jrumon,
bare heads though right? no valves etc?
kevin

[jrumon]

Correct... they are bare.

[fnshrmaster]

Just bare heads Kevin.I need alot more for my motor so grab those bad boys if you can use

[jrumon]

Kevin...if your seriously interested...

For the sake of your sweet Checkmate project... I will cut you a DEAL on these heads if you need them!!! E-mail me direct at:

jrumon@yahoo.com

[jrumon]

Merry X-MAS... First $600 takes them!!!

[boatn70]

well, i did my port work myself.
this was my first time....call me a virgin but it turned out ok, got them flowed and they looked pretty good!!
sorry, ive been telling anyone i know about your heads but......
no luck

[jrumon]

WHAT>>> NO TAKERS for $600!!!!! http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/jpshakehead.gif

These were Brand new Merc GM castings $600+ bare by themselves, then sent out for a killer professional port & flow job including CC matching the chambers and port volume...a $1000+ job in itself.... http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/xxrotflmao.gif

LAST CHANCE before I wake-up and keep them! So ANY takers on a $1600 set of heads for $600 http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/brickwall.gif

[fnshrmaster]

Jim,Did you sell these bad boys?

[jrumon]

Sorry, they actually just SOLD last week and were shipped UPS this morning to DASH at Fox River Performance Marine in Oshkosh, WI.

Kurt, when your ready to build that 502... CALL ME! I can recommend a few goodies to keep you in "budget" and really wake up that motor! Now that you got the KEY component (headers), the sky's the limit...or is it wallet??? http://www.checkmate-boats.com/infopop/emoticons/icon_wink.gif Jim.