promaxx heads

Automotive powered airboat discussion.
Post Reply
josh_2562
Site Supporter - III
Site Supporter - III
Posts: 1521
Joined: Sun Aug 12, 2007 2:25 pm
Location: Inglis, FL 34449

promaxx heads

Post by josh_2562 » Thu May 21, 2015 9:15 pm

Has anyone every ran promaxx heads? http://www.skipwhiteperformance.com/det ... 9200-274-P

todd glover
Southern Airboat Member
Posts: 1956
Joined: Sat May 10, 2008 6:56 pm

Re: promaxx heads

Post by todd glover » Fri May 22, 2015 3:49 am

Yes I have a set 383 pump gas 480 tq 4700 and made 503 HP 5900 and that was realized HP tq not corrected and I have a small cam below 500 l and 235 @ 50

josh_2562
Site Supporter - III
Site Supporter - III
Posts: 1521
Joined: Sun Aug 12, 2007 2:25 pm
Location: Inglis, FL 34449

Re: promaxx heads

Post by josh_2562 » Fri May 22, 2015 4:39 am

Todd are you running them on a airboat? If so how long have you been running them? Are they stock from promaxx or did you change the valves and other stuff. Thanks for the help

flying fish
Site Supporter - II
Site Supporter - II
Posts: 1877
Joined: Thu Jun 21, 2007 11:09 pm
Location: Elkhart, Kansas

Re: promaxx heads

Post by flying fish » Fri May 22, 2015 4:12 pm

Josh
Compared to the ZZ4 heads you currently have, I wonder if there would be any gain vs dollars spent??
15' DB - 6.2 LSA - 4 blade 82" R - 2.52 CH-4

josh_2562
Site Supporter - III
Site Supporter - III
Posts: 1521
Joined: Sun Aug 12, 2007 2:25 pm
Location: Inglis, FL 34449

Re: promaxx heads

Post by josh_2562 » Fri May 22, 2015 6:21 pm

Flying fish I've seen used zz4 heads going for $600 on ebay. I would only be out of pocket $200-$300. From what I have read online the zz4 heads do not flow to well.
Thanks for the help

todd glover
Southern Airboat Member
Posts: 1956
Joined: Sat May 10, 2008 6:56 pm

Re: promaxx heads

Post by todd glover » Fri May 22, 2015 8:12 pm

If you already have a decent set of alm heads I wouldn't switch the heads a zz4 STK should be easy to get another 80-100 HP out of it with other changes

SthrnStyle3
Southern Airboat Member
Posts: 510
Joined: Mon Apr 06, 2009 6:41 pm
Location: Sanford, FL

Re: promaxx heads

Post by SthrnStyle3 » Fri May 22, 2015 11:42 pm

You wouldn't be interested in getting rid of some heads would you??
12' aluminum hull, 350 sbc w/ flattop Pistons and camel hump heads, side by side seating w/ double in front, 2:1 gearbox and a 78" whirlwind whispertip 2.0

flying fish
Site Supporter - II
Site Supporter - II
Posts: 1877
Joined: Thu Jun 21, 2007 11:09 pm
Location: Elkhart, Kansas

Re: promaxx heads

Post by flying fish » Sat May 23, 2015 7:51 am

josh_2562 wrote:Flying fish I've seen used zz4 heads going for $600 on ebay. I would only be out of pocket $200-$300. From what I have read online the zz4 heads do not flow to well.
Thanks for the help
You are welcome. :)
15' DB - 6.2 LSA - 4 blade 82" R - 2.52 CH-4

flying fish
Site Supporter - II
Site Supporter - II
Posts: 1877
Joined: Thu Jun 21, 2007 11:09 pm
Location: Elkhart, Kansas

Re: promaxx heads

Post by flying fish » Sat May 23, 2015 8:00 am

Josh

Torque from a set of heads that beats your current set of heads will cost you $2500ish dollars.

Check out AFR's 195 CC CNC ported head if you want velocity from a small runner.

You will have a hard time beating the torque capability your current heads can produce.
15' DB - 6.2 LSA - 4 blade 82" R - 2.52 CH-4

User avatar
BenBad
Site Supporter - VIII
Site Supporter - VIII
Posts: 578
Joined: Tue Jul 07, 2009 11:14 pm
Location: Omaha, Ne
Contact:

Re: promaxx heads

Post by BenBad » Sat May 23, 2015 8:38 am

I am using the AFR's 195 CC CNC ported head and you can see my dyno sheet in my pictures. We did not stroke it when we rebuilt it. My builder said that AFR heads are the only ones he does not completely tear down and check when they come from the factory.
Rick Powers
Omaha NE
http://www.yourtalkingnow.com/

User avatar
junglecat
Site Supporter - IV
Site Supporter - IV
Posts: 1429
Joined: Tue Sep 06, 2011 2:08 pm
Location: Hernando

Re: promaxx heads

Post by junglecat » Sat May 23, 2015 10:21 am

I had the chance to watch dyno pulls of the same short block with three sets of heads . Dart, Pro-comp, and AFR , the Pro-comps and Darts were within a ft lb or 2. The AFRs were 17 ft lbs more. Pretty much same story with horsepower with AFRs making most . The downside like Flying FIsh said is you are looking at 2500.00$ .
Jungle Cat2 2012 Panther Thunder 14'x7'9"/ LiL John Rigging
Larry Smith built 427 SBC
2.68 Ox Box
82" 3 blade R
Citrus County Airboat Alliance Member

todd glover
Southern Airboat Member
Posts: 1956
Joined: Sat May 10, 2008 6:56 pm

Re: promaxx heads

Post by todd glover » Sat May 23, 2015 1:30 pm

The heads are important but the combo is 10x more critical the wrong cam intake carb timing etc will make or break a motor sounds like you have decent heads maybe find a great engine builder get some mild bowl work lite port work better can and intake Afr heads are good 23 deg heads but you will gain more with a solid combo than same combo with better heads

User avatar
Waterthunder
Site Supporter - VIII
Site Supporter - VIII
Posts: 8166
Joined: Fri Jan 21, 2005 3:16 pm
Location: Melbourne
Contact:

Re: promaxx heads

Post by Waterthunder » Sat May 23, 2015 8:19 pm

I would go with the correct Hydraulic roller. You will gain more with the perfect cam than you will gain with a new set of heads. Also I wouldn't run a solid roller in a airboat we are only turning 5,500RPM's or so.
THE PROOF IS IN THE PROP!

"If you copy someone you will only achieve what has already been done."

http://waterthunder.com/
321-508-5316

josh_2562
Site Supporter - III
Site Supporter - III
Posts: 1521
Joined: Sun Aug 12, 2007 2:25 pm
Location: Inglis, FL 34449

Re: promaxx heads

Post by josh_2562 » Sun May 24, 2015 2:08 pm

Waterthunder my engine is a 383 with zz4 heads and intake. I've read in more then one post that you said these heads are junk. For a cam I plan to go hydraulic roller from comp cams. Im going to go with what they recommend unless y'all know of a good grind to run.
So do you guys think running the zz4 heads would be better then these promaxx head? I do plan to change my intake to a rpm airgap. Thanks for the help

josh_2562
Site Supporter - III
Site Supporter - III
Posts: 1521
Joined: Sun Aug 12, 2007 2:25 pm
Location: Inglis, FL 34449

Re: promaxx heads

Post by josh_2562 » Wed May 27, 2015 9:25 am

I got the engine taken apart. Didn't find anymore damage from the cam coming apart. The heads are 10088113 L98 vette heads. Zz4 part #12556463. I'm not sure what the difference between them. Online they say the zz4 flow better because gm ports them.
Bottom end has scat crank and rods with keith black -18cc pistons. Two of the pistons have about quarter size spots that look like maybe the headgaskets were leaking. i'll post pics later today.
Im going to take the block and heads to powerhouse in ocala to be checked out.
After doing some reading about cams I see why no one ever offers a grind to use. Once the long block is build I'll call comp cams and see what they recommend. Thanks for the help

T-REX
Site Supporter - IV
Site Supporter - IV
Posts: 1696
Joined: Sat Mar 12, 2005 2:10 am

Re: promaxx heads

Post by T-REX » Sun Jul 05, 2015 7:08 am

Buy your cam ( and springs)from wt...... You'll be spending the same money.....
And it'll be right. Not a generic 'torque' ( shelf)cam from summit/jegs/ parts house.

Post Reply

Return to “Automotive Power Only”