TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - That Voodoo that you do
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

That Voodoo that you do

 Post Reply Post Reply
Author
Message
Babycakes View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Feb/24/2010
Location: Henderson, Nv
Status: Offline
Points: 145
Post Options Post Options   Thanks (0) Thanks(0)   Quote Babycakes Quote  Post ReplyReply Direct Link To This Post Topic: That Voodoo that you do
    Posted: Mar/19/2018 at 12:47am
Lunati Voodoo 10100702 has a Gross Valve Lift (Int/Exh): .507/.527.  I am using early rocker stud heads.  Could the stock rockers tolerate this amount of lift?  I recall .510 being the limit.  I just don't remember if that limit was for the bridged rockers only.
Back to Top
WesternRed View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Aug/03/2010
Location: Australia
Status: Offline
Points: 5787
Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Mar/19/2018 at 1:46am
My 71 360 with 993 heads has been running a Crane H-272-2 272/284 adv, 216/228 @ 050, 484/512 lift 112 LSA for years with stock rocker gear apparently, but has wiped out an exhaust lobe at some stage.
Back to Top
tufcj View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Supporter of TheAMCForum

Joined: Jul/10/2007
Location: Watkins, CO
Status: Offline
Points: 4065
Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Mar/19/2018 at 10:53am
The biggest thing you need to look at is clearance between the top of the valve guide and the valve retainer.   I've seen engines with just over .500 lift crush the umbrella style valve seals.  If you've had the guides machined for a positive type valve seal, then you should be good to go.

Bob
tufcj  
69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
Back to Top
6PakBee View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Charter Member

Joined: Jul/01/2007
Location: North Dakota
Status: Offline
Points: 5454
Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Mar/19/2018 at 11:11am
According to Erson the maximum lift for the stock rockers is 0.510".  Here is their tech sheet.

http://www.pbm-erson.com/content/erson_amctech
Roger Gazur
1969 'B' Scheme SC/Rambler
1970 RWB 4-spd Machine
1970 Sonic Silver auto AMX

All project cars.

Forum Cockroach
Back to Top
DaemonForce View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/05/2012
Location: Olympia, WA
Status: Offline
Points: 1070
Post Options Post Options   Thanks (0) Thanks(0)   Quote DaemonForce Quote  Post ReplyReply Direct Link To This Post Posted: Mar/19/2018 at 4:18pm
Originally posted by tufcj tufcj wrote:

The biggest thing you need to look at is clearance between the top of the valve guide and the valve retainer.   I've seen engines with just over .500 lift crush the umbrella style valve seals.

This is exactly why I recommend remachining for large cams. I refer to that clearance between valve guide and valve retainer as maximum safe distance. There are other things that will effect performance like rocker type, weight, spring and stud size but we mostly don't need to worry about that on these engines. Just pay attention to the seal you're using and the retainers. You should be able to effectively clear .500" travel with umbrella seals. Otherwise, you have issues with seal quality or a number of other things to check out.
1971 Javelin SST
American 304 2v | FMX | AM20-3.31

1983 American Limited
Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72
Back to Top
FSJunkie View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jan/09/2011
Location: Flagstaff, AZ
Status: Offline
Points: 4741
Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Mar/20/2018 at 2:38am
Blazing Saddles, character Hedley Lemar: "Now go do that voodoo that you do so well!" 
1955 Packard
1966 Marlin
1972 Wagoneer
1973 Ambassador
1977 Hornet
1982 Concord D/L
1984 Eagle Limited
Back to Top
6PakBee View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Charter Member

Joined: Jul/01/2007
Location: North Dakota
Status: Offline
Points: 5454
Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Mar/20/2018 at 7:22am
Originally posted by FSJunkie FSJunkie wrote:

Blazing Saddles, character Hedley Lemar: "Now go do that voodoo that you do so well!" 


I've been waiting for someone to do this!  One of my favorite lines out of the movie.
Roger Gazur
1969 'B' Scheme SC/Rambler
1970 RWB 4-spd Machine
1970 Sonic Silver auto AMX

All project cars.

Forum Cockroach
Back to Top
gd5052 View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Jun/16/2011
Location: Illinois
Status: Offline
Points: 108
Post Options Post Options   Thanks (0) Thanks(0)   Quote gd5052 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/20/2018 at 9:48am
I like the camp fire scene
Back to Top
Ralph G. View Drop Down
AMC Apprentice
AMC Apprentice


Joined: Apr/06/2016
Location: Cincinnati
Status: Offline
Points: 185
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ralph G. Quote  Post ReplyReply Direct Link To This Post Posted: Mar/20/2018 at 10:53am
Yeah, it was a gas!
Back to Top
FSJunkie View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jan/09/2011
Location: Flagstaff, AZ
Status: Offline
Points: 4741
Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Mar/20/2018 at 6:57pm
Originally posted by gd5052 gd5052 wrote:

I like the camp fire scene
More beans, Mr. Taggert? 

One of the best comedies ever. 
1955 Packard
1966 Marlin
1972 Wagoneer
1973 Ambassador
1977 Hornet
1982 Concord D/L
1984 Eagle Limited
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.156 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or