Like Tree0Likes

alluminum vs. cast iron heads

Reply
Old 01-10-2006, 08:15 PM
  #11
Registered
Thread Starter
 
Join Date: Oct 2005
Posts: 48
Default Re: alluminum vs. cast iron heads

Thanks Rookie, I posted it there now.
Jeremy

Last edited by berman58; 01-10-2006 at 08:18 PM.
berman58 is offline  
Reply With Quote
Old 01-10-2006, 08:24 PM
  #12
Registered
 
24skaterVA's Avatar
 
Join Date: Dec 2005
Location: Lanexa VA/St. Pete FL
My Boats: 24' Skater twin 2.5 ROS, 353 Fastech, Malibu Response LXI, 1986 STV Pro Comp Ski
Posts: 384
Default Re: alluminum vs. cast iron heads

If your looking for a good alum. head out of the box I Highly recommend the AFRs. If your looking to go bigger down the road & wanna do a lot of porting I suggest the Brodix. You will love having a set of alum heads, you will be able to tell a considerable difference. You mat also want to talk to an experienced BOAT motor builder, a good combo (heads, cam, rockers, intake, etc.etc.) is always better than just going BIG.
24skaterVA is offline  
Reply With Quote
Old 01-10-2006, 08:30 PM
  #13
Registered
Thread Starter
 
Join Date: Oct 2005
Posts: 48
Default Re: alluminum vs. cast iron heads

Thanks for the post
Its not me building the engines. It's an engine builder with a lot of experience. I'm not a mechanic but do want to know as much as possible. He's given me choices and want to make an educated decision. Also if someone has done this combonation before their opinion would be great. Really don't want more power just more reliability. If i could squeak more hp reliably and drop boost that would seem to make sense...

Last edited by berman58; 01-10-2006 at 08:33 PM.
berman58 is offline  
Reply With Quote
Old 01-10-2006, 08:32 PM
  #14
Charter Member # 545
Gold Member
 
Beak Boater's Avatar
 
Join Date: Dec 2000
Location: Port Tobacco MD/Cape Coral Fl
Posts: 2,151
Default Re: alluminum vs. cast iron heads

I ran AFR aluminum heads on a set of whippled 540's with 7 LBS of boost. The motors have almost 350 hrs and have been in 2 different boats. No problem. Just match the intake runner size to cam you are using. AFR has a tech line, or their are a couple of dealers on the board. Mercury Marine uses Edlebrock Aluminum heads on the 600 SCI motors. With aluminum heads you could go with more compression safely. 8.5-9.0 on pump gas. Good luck.
Beak Boater is offline  
Reply With Quote
Old 01-10-2006, 08:34 PM
  #15
Registered
Thread Starter
 
Join Date: Oct 2005
Posts: 48
Default Re: alluminum vs. cast iron heads

That sounds awesome thanks for the reply
berman58 is offline  
Reply With Quote
Old 01-11-2006, 05:44 PM
  #16
Registered
 
birdog's Avatar
 
Join Date: Jan 2002
Location: Batavia Oh.
My Boats: Top Gun
Posts: 4,034
Default Re: alluminum vs. cast iron heads

Quote:
Originally Posted by blastersbro
that combo sounds like junk who built it?
Am i missing something here ?....Do you have something against this guy ?
birdog is offline  
Reply With Quote
Old 01-11-2006, 05:56 PM
  #17
Registered
VIP Member
 
Join Date: Jan 2004
Location: Boca Raton, FL
My Boats: None
Posts: 3,682
Default Re: alluminum vs. cast iron heads

In my quest and thirst for more knowledge I have asked the same question to many different engine builders and here's what I've been told:

Aluminum heads dissipate heat faster, so you can have a little more compression without the detonation.

The negative aspect, of course, is the corrosion in salt water.

These are the only two factors that nobody I asked disagreed on!
Edward R. Cozzi is offline  
Reply With Quote
Old 01-11-2006, 07:58 PM
  #18
Registered
Thread Starter
 
Join Date: Oct 2005
Posts: 48
Default Re: alluminum vs. cast iron heads

Quote:
Originally Posted by blastersbro
671 bds on a 540 is working too hard,creating extra intake heat.no one uses 7.5 compression because it will have no balls in no boost conditions.what else you got?

at 3500 rpm I have plenty of power, in a 1981 fully redone 39foot cigarette I run 58 mph and at 5800 run 86mph
berman58 is offline  
Reply With Quote
Old 01-11-2006, 08:32 PM
  #19
Registered
 
Join Date: Jun 2005
Location: Annapolis Md
My Boats: 04 donzi zrc,06 donzi zfo
Posts: 678
Default Re: alluminum vs. cast iron heads

aluminum head advantage:better port design,cnc porting available most brands,can run more compression with less chance of detonation,less weight,easier to repair, more power due to better port design.i use afr cnc ported on all my 540/565/572/598 engine combo great reliabity no problems.as far as corosion we hard coat anodize and recommend flushing with salt away i beleive they should last as long as cast iron.i am a dealer for afr have heads in stock .dave 410-956-5381. aluminum disadvantage more money
MDGperformance is offline  
Reply With Quote
Old 01-11-2006, 08:46 PM
  #20
Platinum Member
Platinum Member
 
Viper31's Avatar
 
Join Date: Sep 2002
Location: Millersville,MD
Posts: 380
Default Re: alluminum vs. cast iron heads

Quote:
Originally Posted by MDGperformance
aluminum head advantage:better port design,cnc porting available most brands,can run more compression with less chance of detonation,less weight,easier to repair, more power due to better port design.i use afr cnc ported on all my 540/565/572/598 engine combo great reliabity no problems.as far as corosion we hard coat anodize and recommend flushing with salt away i beleive they should last as long as cast iron.i am a dealer for afr have heads in stock .dave 410-956-5381. aluminum disadvantage more money
Dave,

What kind of longevity have you seen from the AFR's as far as hours run before valve job is needed? I know many people are having great success with these heads but I was curious if their exhaust seats are ground wide enough to last in a boat engine.

Thanx
Viper31 is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
gripit
General Q & A
9
11-25-2006 07:38 PM
berman58
General Q & A
15
01-13-2006 08:18 AM
88Fount33
General Q & A
3
10-21-2005 11:00 AM
9Hound
General Q & A
9
07-22-2005 03:40 PM
WILD ONE
General Q & A
18
01-24-2003 12:39 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:54 AM.


Copyright 2011 OffShoreOnly. All rights reserved.