Offshoreonly.com

Go Back  Offshoreonly.com > Technical > General Q & A
489 build critique >

489 build critique

Register
FAQ
Calendar
Today's Posts
Search
Vendor Directory
Notices

489 build critique

Thread Tools
 
Old 02-26-2016, 06:11 PM
  #131  
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
Posts: 491
Received 13 Likes on 8 Posts
Default
Wrong number
Originally Posted by endeavour32
Call this guy saw he has these for sale- He has a set of Drakes (early eickerts) for sale, complete with everything for $400. That's a great deal for some pretty good manifolds. These are way better than the stock 496 manifolds.

518-630-3784- guys name is Dennis.
mggdoors is offline  
Reply
Old 02-26-2016, 06:14 PM
  #132  
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
Posts: 491
Received 13 Likes on 8 Posts
Default
How much shim would I need. Lift on cam is 547. Springs are 560 max
Originally Posted by GPM
They may lose a few pounds on break in, do you have any room to shim them up, I would think a little more is better than not enough. I do think you will be happier with this cam. Just my opinion.
mggdoors is offline  
Reply
Old 02-26-2016, 06:50 PM
  #133  
Registered
iTrader: (4)
 
Join Date: May 2009
Location: Chicago, IL; Onekama, MI
Posts: 3,887
Received 121 Likes on 66 Posts
Default
Nope right number wrong name- ask for Ryan
endeavour32 is offline  
Reply
Old 02-26-2016, 07:15 PM
  #134  
GPM
Registered
 
Join Date: Mar 2004
Location: Pa
Posts: 2,664
Received 80 Likes on 58 Posts
Default
Depends on spring rate as to what you would gain. .560 is Max lift but how close you are to coil bind ?
GPM is offline  
Reply
Old 02-26-2016, 07:21 PM
  #135  
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
Posts: 491
Received 13 Likes on 8 Posts
Default
Machinist said coil bond was tad over 600
Originally Posted by GPM
Depends on spring rate as to what you would gain. .560 is Max lift but how close you are to coil bind ?
mggdoors is offline  
Reply
Old 02-26-2016, 07:22 PM
  #136  
GPM
Registered
 
Join Date: Mar 2004
Location: Pa
Posts: 2,664
Received 80 Likes on 58 Posts
Default
I'm just a backyard guy, but I would want stronger springs, something like Comps 930.
Last edited by GPM; 02-26-2016 at 07:27 PM.
GPM is offline  
Reply
Old 02-26-2016, 08:33 PM
  #137  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,304
Received 1,494 Likes on 808 Posts
Default
http://www.offshoreonly.com/forums/g...rformance.html
getrdunn is offline  
Reply
Old 02-26-2016, 09:00 PM
  #138  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,304
Received 1,494 Likes on 808 Posts
Default
Originally Posted by mggdoors
So ordered xm284hr cam lifters. According to comp cams guys the kits that come with the springs are 112seat pressure 345 open. Says mine should be fine at 110 365. What do you think
It would be best to use the springs that are recommended with the 284. Those extra 20pds pressure will likely wipe the bumps off your stick. Ha.. Then it's boom chucka boom time only. Valve-train components are not rocket science yet very critical. Be certain you get it right the first time though and call comp again so your 100% certain with spring pressures, stability etc.

Also make sure and ck for proper pushrod length on both intake and exhaust.
getrdunn is offline  
Reply
Old 02-27-2016, 10:12 AM
  #139  
Registered
Thread Starter
 
Join Date: Jan 2016
Location: San Tan Valley AZ
Posts: 491
Received 13 Likes on 8 Posts
Default
I will call again to verify. Next thing I need to know. Oil bypasses. Currently using truck engine converted marine. I have the 40lb bypasses sitting on the shelf I need to know how to configure them. The blocks have oil cooler fittings on the side I have remote filter relocates from summit for where factory filter was. Also we are running a crossover so worried that oil temp will not get hot enough. Should I be running a oil thermostat and pressure relief on the water side. Stock 300hp oil coolersI
Originally Posted by getrdunn
It would be best to use the springs that are recommended with the 284. Those extra 20pds pressure will likely wipe the bumps off your stick. Ha.. Then it's boom chucka boom time only. Valve-train components are not rocket science yet very critical. Be certain you get it right the first time though and call comp again so your 100% certain with spring pressures, stability etc.

Also make sure and ck for proper pushrod length on both intake and exhaust.
mggdoors is offline  
Reply
Old 02-27-2016, 05:44 PM
  #140  
Registered
iTrader: (3)
 
Join Date: Jul 2004
Location: chicago
Posts: 11,332
Received 71 Likes on 39 Posts
Default
Originally Posted by mggdoors
So ordered xm284hr cam lifters. According to comp cams guys the kits that come with the springs are 112seat pressure 345 open. Says mine should be fine at 110 365. What do you think
Originally Posted by mggdoors
How much shim would I need. Lift on cam is 547. Springs are 560 max
Originally Posted by getrdunn
It would be best to use the springs that are recommended with the 284. Those extra 20pds pressure will likely wipe the bumps off your stick. Ha.. Then it's boom chucka boom time only. Valve-train components are not rocket science yet very critical. Be certain you get it right the first time though and call comp again so your 100% certain with spring pressures, stability etc.

Also make sure and ck for proper pushrod length on both intake and exhaust.
According to my comp catalog, the spring that comes with that cam is the 924 spring. That spring is rated at 112 @ 1.900. And 355 @ 1.200 . Not sure how you are getting 345 open, since with .547 lift, you'll be 1.350, which would be more like 300lbs open. Coil bind is at 1.175. At full lift, you will be .178 from coil bind. If you were to install them at 1.850, you would have more like 130 on the seat, and 320 open, and be .128 from coil bind. Which is still a bit light and what not, but since it's a low rpm deal, would work fine. Just my opinion. And all that needs to be checked during assembly.
MILD THUNDER is offline  
Reply



Advanced Search

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.