Go Back  Offshoreonly.com > Technical > General Q & A
Heads Iron Vs alunimum >

Heads Iron Vs alunimum

Notices

Heads Iron Vs alunimum

Old 01-16-2017, 08:25 PM
  #31  
Registered
Thread Starter
iTrader: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
Posts: 10,061
Received 690 Likes on 276 Posts
Default

Originally Posted by SB
Is alunimum like awuminum ?



Only after several capt and cokes....
phragle is offline  
Old 01-18-2017, 07:02 PM
  #32  
Registered
 
Join Date: Oct 2012
Location: Buffalo NY
Posts: 896
Received 36 Likes on 9 Posts
Default

I think we messaged about my build.

454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet

Basic Operating RPM Range: 3,000-6,000

Intake Duration at 050 inch Lift: 236

Exhaust Duration at 050 inch Lift: 246

Duration at 050 inch Lift: 236 int./246 exh.

Advertised Intake Duration: 296

Advertised Exhaust Duration: 306

Advertised Duration: 296 int./306 exh.

Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.

Merc HP500 heads. 2.25 intake 1.88 exhaust

525sc/177blower
dominator carb

Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.
79formula is offline  
Old 01-18-2017, 07:28 PM
  #33  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,299
Received 1,485 Likes on 803 Posts
Default

Originally Posted by 79formula
I think we messaged about my build.

454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet

Basic Operating RPM Range: 3,000-6,000

Intake Duration at 050 inch Lift: 236

Exhaust Duration at 050 inch Lift: 246

Duration at 050 inch Lift: 236 int./246 exh.

Advertised Intake Duration: 296

Advertised Exhaust Duration: 306

Advertised Duration: 296 int./306 exh.

Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.

Merc HP500 heads. 2.25 intake 1.88 exhaust

525sc/177blower
dominator carb

Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.

Those cams sound good on 454/468. Get as much air in and out of there as possible. You have scoops or enough clearance without. Install extra vents if need be. Intercooler pros and cons.
getrdunn is offline  
Old 01-18-2017, 07:57 PM
  #34  
Registered
Thread Starter
iTrader: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
Posts: 10,061
Received 690 Likes on 276 Posts
Default

Originally Posted by 79formula
I think we messaged about my build.

454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet

Basic Operating RPM Range: 3,000-6,000

Intake Duration at 050 inch Lift: 236

Exhaust Duration at 050 inch Lift: 246

Duration at 050 inch Lift: 236 int./246 exh.

Advertised Intake Duration: 296

Advertised Exhaust Duration: 306

Advertised Duration: 296 int./306 exh.

Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.

Merc HP500 heads. 2.25 intake 1.88 exhaust

525sc/177blower
dominator carb

Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.

Howsmit running with that static compression? what kind of fuel?
phragle is offline  
Old 01-18-2017, 08:11 PM
  #35  
Registered
 
Join Date: Oct 2012
Location: Buffalo NY
Posts: 896
Received 36 Likes on 9 Posts
Default

Originally Posted by phragle
Howsmit running with that static compression? what kind of fuel?
Runs perfect. I have been told that is what merc should have used with the small blower. I also run 34* of timing. I use 91 non-ethanol. All marinas and many stations have it.
79formula is offline  
Old 01-18-2017, 08:19 PM
  #36  
Registered
Thread Starter
iTrader: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
Posts: 10,061
Received 690 Likes on 276 Posts
Default

Originally Posted by 79formula
Runs perfect. I have been told that is what merc should have used with the small blower. I also run 34* of timing. I use 91 non-ethanol. All marinas and many stations have it.
The small or big upper pulley?
phragle is offline  
Old 01-18-2017, 08:22 PM
  #37  
Registered
 
Join Date: Oct 2012
Location: Buffalo NY
Posts: 896
Received 36 Likes on 9 Posts
Default

I don't know if my pulley is small or big. I do know its 1/2 the diameter of the crank pulley. Makes about 4.5psi to 5psi of boost.
79formula is offline  
Old 01-18-2017, 08:59 PM
  #38  
Registered
Thread Starter
iTrader: (3)
 
Join Date: Apr 2006
Location: Toledo Oh
Posts: 10,061
Received 690 Likes on 276 Posts
Default

Originally Posted by 79formula
I don't know if my pulley is small or big. I do know its 1/2 the diameter of the crank pulley. Makes about 4.5psi to 5psi of boost.

Im full of questions tonight...since I am looking at a 242 without motor... how well does it fit back there?? hatch clearance etc....??
phragle is offline  
Old 01-18-2017, 10:01 PM
  #39  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,299
Received 1,485 Likes on 803 Posts
Default

Originally Posted by phragle
Im full of questions tonight...since I am looking at a 242 without motor... how well does it fit back there?? hatch clearance etc....??
Pm endeavour32
He had one years back and was in and out of the bilge I know that for sure.
getrdunn is offline  
Old 01-19-2017, 05:47 PM
  #40  
Registered
 
Join Date: Oct 2012
Location: Buffalo NY
Posts: 896
Received 36 Likes on 9 Posts
Default

My 242 is an 86. It has about 2.5 inches of clearence. If your boat is an 87 or newer, the hatch is a few inches taller than the 86 and older boats.
Originally Posted by phragle
Im full of questions tonight...since I am looking at a 242 without motor... how well does it fit back there?? hatch clearance etc....??
79formula is offline  

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


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.