Go Back  Offshoreonly.com > Technical > General Q & A
502 build advise >

502 build advise

Like Tree1Likes

502 build advise

Old 05-12-2018, 07:53 AM
  #1  
Registered
Thread Starter
 
Join Date: May 2018
Posts: 168
Default 502 build advise

Hello everyone
new to the forums
i searched the forums for answers before I posted so not to put up yet another build thread
to start I have a 2000 33 outlaw twin 502 mag mpiís that are stock
my thoughts are to pull the low hour mills and freshen up with a hone and rings and bearings on the bottom end. Then have heads checked and install inconels on the exhaust and springs to match the yet to be determined cam.
i am wanting a fairly mild 600ish hp and was leaning towards a 8/71 with twin 750ís along with manifolds like imco powerflows with risers. Forgot to add that the oil cooler will be upgraded. Boat has full hydraulic to the helm.
please share some of your experiences with a somewhat budget build along with doís and donít
Thanks in advance
Bajaorlando is offline  
Old 05-12-2018, 01:07 PM
  #2  
Registered
 
Join Date: Jan 2006
Location: Peoria, IL
Posts: 2,525
Default

An 871 could make up to 800hp. You could make 600hp easy with new heads like Brodix dragon slayers 320 or promax 317s with a 741 cam and good exhaust.
hogie roll is offline  
Old 05-12-2018, 01:25 PM
  #3  
Platinum Member
Platinum Member
iTrader: (6)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
Posts: 6,815
Default

If you cant do a bunch of this work yourself, you could easily spend 20-30k to get this done...........I had the same power and boat at one time
F-2 Speedy is online now  
Old 05-12-2018, 06:23 PM
  #4  
Registered
Thread Starter
 
Join Date: May 2018
Posts: 168
Default

I do plan on doing all the work myself with the exception of machine work. I will buy my own pieces.
Bajaorlando is offline  
Old 05-12-2018, 06:25 PM
  #5  
Registered
Thread Starter
 
Join Date: May 2018
Posts: 168
Default

Was just hoping for some real world examples of similar builds. My biggest questions are cam and exhaust and how much boost with the iron heads and the mag pistons
Bajaorlando is offline  
Old 05-12-2018, 07:55 PM
  #6  
Registered
iTrader: (1)
 
Join Date: Oct 2013
Location: SF Bay Area
Posts: 2,611
Default

My recommendation would be to leave well enough alone. If you canít do that then buy some already made power out of the swap shop here as thereís a multitude of reputable sellers here and sell the stock power for a pretty penny. If you canít do that then call Eddie Young who is incredibly helpful to the community will save you literally boat loads of grief and money.

600hp is commonly attained with some good heads and Crane 168741 cam, and your Bravo drives may actually live through the summer.

You should actually call Eddie first and he can answer what youíre looking for.
Baja Rooster is offline  
Old 05-13-2018, 08:15 AM
  #7  
Registered
 
Join Date: Jan 2006
Location: Peoria, IL
Posts: 2,525
Default

Originally Posted by Bajaorlando View Post
Was just hoping for some real world examples of similar builds. My biggest questions are cam and exhaust and how much boost with the iron heads and the mag pistons
I think stock CR is 8.75. You could run maybe 7psi non intercooled on an 8-71 with that. Exhaust you should check out the thunder n lightning cast aluminum. Dry to tip tails will let you get aggressive with the cam. Most people like the 741 cam, it is the 525 efi cam I believe, or similar. That combo would make 700-800hp depending on cam and boost.
hogie roll is offline  
Old 05-14-2018, 06:52 AM
  #8  
Registered
Thread Starter
 
Join Date: May 2018
Posts: 168
Default

Thanks Hogie
what are the rest of the numbers on that cam
Will it work with my GM lifters?
Bajaorlando is offline  
Old 05-14-2018, 08:05 AM
  #9  
Registered
 
convincor's Avatar
 
Join Date: Nov 2002
Location: CT
Posts: 511
Default

Crane 168741, and you need lifters as well. 13532-16
convincor is offline  
Old 05-14-2018, 08:08 AM
  #10  
Registered
Thread Starter
 
Join Date: May 2018
Posts: 168
Default

Thank you
Bajaorlando is offline  

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