Go Back  Offshoreonly.com > Technical > General Q & A
502 Rebuild Cam Selection >

502 Rebuild Cam Selection

Notices

502 Rebuild Cam Selection

Thread Tools
 
Old 09-09-2011 | 08:39 AM
  #11  
Thread Starter
Banned
 
Joined: Apr 2011
Posts: 213
Likes: 0
Default

Originally Posted by 1BIGJIM
I have a brand new zero hour stock Merc cam out of a 502 Gen VI . With springs and retainers $75. The springs alone cost over a $100 when you replace a cam.
Call me --just saw your private message as well. 313-805-2107
brivander is offline  
Reply
Old 09-09-2011 | 07:42 PM
  #12  
Registered
20 Year Member
 
Joined: Jun 2004
Posts: 1,949
Likes: 37
From: Omaha, Nebraska. Boat on the Mighty Mo! Longest river in the USA!
Default

Originally Posted by brivander
Call me --just saw your private message as well. 313-805-2107
Shoot me an email and I will send you my phone number.
Sorry got this late. I had two of the cams and sold one already. Not trying to make money, just help someone out

[email protected]
1BIGJIM is offline  
Reply
Old 09-13-2011 | 09:00 AM
  #13  
mcollinstn's Avatar
Platinum Member
20 Year Member
Platinum Member
 
Joined: Sep 2001
Posts: 5,769
Likes: 150
From: tn
Default

Originally Posted by 1BIGJIM
I have a brand new zero hour stock Merc cam out of a 502 Gen VI . With springs and retainers $75. The springs alone cost over a $100 when you replace a cam.
Umm, a Gen 6 cam would be a roller cam.

What "generation" is your OMC 502? Year of boat is 1992? If it's the original motor, it could be a Mk IV or Gen 5. You need to know that.

A Gen 6 cam will bolt in either one, as long as you use the Gen 6 timing set and retainer plate, but a Mk IV DOESN'T have provisions for the dogbone roller lifter retainer plate so you'll have to use retrofit roller lifters ($475) and matching pushrods ($150).

MC
mcollinstn is offline  
Reply
Old 09-21-2011 | 11:27 PM
  #14  
Thread Starter
Banned
 
Joined: Apr 2011
Posts: 213
Likes: 0
Default

Ok, so it looks like everyone will be happy and I'm ready to eat crow now, apparently my indecisiveness paid off. I found a great deal on the CP Performance kit (he was asking $500 with 1.72 roller tips and I offered him $400 without them, more on that later) on the internet (brand new in boxes!!!) -- it is this kit, but the guy had already sold the cam, and the kit didn't include a timing chain even though it's in the picture:

http://www.cpperformance.com/p-11620...ifter-kit.aspx

These are the parts I got, they are all Comp Cam parts in the kit:
854-16 --Roller Lifters
930-16 --Springs
612-16 --Locks
505-16 --Seals
7815-16 --Push Rods
741-16 --Retainers
205 --Cam Button


RMBuilder??? (Bob) is grinding me a custom stick (not sure quite what yet, we'll talk tomorrow) and I'm also buying the timing chain he recommended. He also suggested some roller rockers to go under the stock covers ilo of the 1.72 roller tips the guy had. To top it off I talked to my engine builder and he was willing to not charge me for most of the stuff included in the cost of the re-build, so that price is going down about $300. All in all this could not have worked out better! As noted I always thought this was the better idea, but money was getting in the way, for a net of $700 - $800 I couldn't pass this up.

Bob Madera has to be about the most patient man alive to work with me through all of this and my frustration and I can't thank him enough!!! I gotta say, I'm pretty excited Hopefully I will get to put some break in time on it at least before I have to put it away...It's going to be a long winter...
brivander is offline  
Reply
Old 09-29-2011 | 10:36 AM
  #15  
Thread Starter
Banned
 
Joined: Apr 2011
Posts: 213
Likes: 0
Default

Here is where I ended up:
- Block decked .010
- Heads decked .010 (both of these net 9.2:1 compression up from stock 8.75)
- Edelbrock performer RPM intake rectangle port 7163 manifold (compliments of dear old dad, how come dads always have the coolest crap laying around??, to bad I ordered one before he told me he already had one...)
- 850 Holley vacuum secondaries
- Stock pistons/rods with ARP bolts
- Stock Crank, shaved .010
- Gen V block coverted to roller via a smoking deal (parts listed above)
- Custom cam by Marine Kinetics, with new timing set and cam retainer plate
- No porting on the heads, but did get a valve job
- Stainless marine manifolds
Cam is on the way and most of the other stuff is assembled.

Any power guesses? Bob said he's seen big power (well, big for me) from similar combinations with his cams, the numbers he was throwing out BLEW me away...way more than expected. I am so antsy to get this thing done, I'll dodge ice if I need to to get it broke in, the Dyno will tell the story soon.

Last edited by brivander; 09-29-2011 at 10:41 AM.
brivander is offline  
Reply

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 © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.