Go Back  Offshoreonly.com > Technical > General Q & A
502 build , cam, heads questions. >

502 build , cam, heads questions.

Notices

502 build , cam, heads questions.

Old 12-03-2019, 02:43 PM
  #1  
Platinum Member
Platinum Member
Thread Starter
 
fastlane40's Avatar
 
Join Date: Oct 2003
Location: Townsville Australia
Posts: 778
Likes: 0
Received 0 Likes on 0 Posts
Default 502 build , cam, heads questions.

Gen VI 502's.4.250 stroke,6.385 rods.No overbore.Compression around 9.3:1
What head CC's 320?I do have 2 sets of factory ported 088 500EFI heads or is any Aluminium head better than the 088?
What HP difference will I see using a 500 731 cam over the 741 525 cam?
If I do use the 731 am I able to use the net lash non adjustable valve train on a gen VI?

fastlane40 is offline  
Old 12-03-2019, 03:38 PM
  #2  
Platinum Member
Platinum Member
iTrader: (6)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
Posts: 7,131
Received 147 Likes on 78 Posts
Default

your 1 step from a 540.........what are you using for fuel supply
F-2 Speedy is online now  
Old 12-03-2019, 04:53 PM
  #3  
Registered
 
Join Date: Jul 2018
Location: Plano, TX
Posts: 97
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by fastlane40 View Post
Gen VI 502's.4.250 stroke,6.385 rods.No overbore.Compression around 9.3:1
What head CC's 320?I do have 2 sets of factory ported 088 500EFI heads or is any Aluminium head better than the 088?
What HP difference will I see using a 500 731 cam over the 741 525 cam?
If I do use the 731 am I able to use the net lash non adjustable valve train on a gen VI?
I did the 731 cam with AFR heads and Victor Jr intake 585 hp/611 tq @ 5200, also added the Holley snipper.

Texascuda is offline  
Old 12-03-2019, 11:13 PM
  #4  
Registered
iTrader: (3)
 
Join Date: Oct 2007
Location: yorkville,il
Posts: 8,415
Received 19 Likes on 11 Posts
Default

i have built several with the 741 cam and engine quest 320 heads,600 hp all day long.
mike tkach is offline  
Old 12-04-2019, 12:49 AM
  #5  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
Posts: 17,578
Received 111 Likes on 65 Posts
Default

You cannot use the non adjustable valve train for anything except the stock magnum cam.
You need rocker arm conversion studs and roller rocker arms for either cam.
Griff is online now  
Old 12-04-2019, 01:48 AM
  #6  
Platinum Member
Platinum Member
Thread Starter
 
fastlane40's Avatar
 
Join Date: Oct 2003
Location: Townsville Australia
Posts: 778
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by F-2 Speedy View Post
your 1 step from a 540.........what are you using for fuel supply
Yes about 8 cubes,
Fuel,Carb 950 I reckon.Aeromotive pumps.
So go straight for a 741 Crane?
Longer travel lifter and roller rockers.
fastlane40 is offline  
Old 12-04-2019, 12:54 PM
  #7  
Registered
 
Join Date: Sep 2019
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

My 540's I went with the 731 cam and made 615hp/689tq. Dart pro 1 325cc heads, dart intake and quick fuel 1050 carb. Definitely on the small side for a 540 but behaves very well and pulls strong up to 5500 rpm.
GlennRotman is offline  
Old 12-04-2019, 01:16 PM
  #8  
Platinum Member
Platinum Member
Thread Starter
 
fastlane40's Avatar
 
Join Date: Oct 2003
Location: Townsville Australia
Posts: 778
Likes: 0
Received 0 Likes on 0 Posts
Default

Would there be any reason to go with the 731 instead of the 741?
Or is there HP to be gained.
fastlane40 is offline  
Old 12-04-2019, 01:26 PM
  #9  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
Posts: 17,578
Received 111 Likes on 65 Posts
Default

The 741 will definitely make more power than the 731 and is a better choice.
Griff is online now  
Old 12-04-2019, 02:01 PM
  #10  
Platinum Member
Platinum Member
iTrader: (6)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
Posts: 7,131
Received 147 Likes on 78 Posts
Default

Originally Posted by fastlane40 View Post
Would there be any reason to go with the 731 instead of the 741?
Or is there HP to be gained.
As stated above Id run the the 741 cam and the EQ heads as Mike said if running in salt, if you're running in freash water might look at the AFR 305 or the Brodix line up
F-2 Speedy is online now  

OSO Sponsor
OSO Advertiser
OSO Advertiser

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

OSO Advertiser