TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - Roller rockers/stock valve covers
  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.

Roller rockers/stock valve covers

 Post Reply Post Reply Page  123>
Author
Message Reverse Sort Order
PHAT69AMX View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/07/2007
Location: West Virginia
Status: Offline
Points: 5904
Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Topic: Roller rockers/stock valve covers
    Posted: Sep/27/2018 at 1:20pm
Harland Sharpe 1.6 fit under stock valve covers on mine, about .51x" valve lift.
Back to Top
rang-a-stang View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Sep/25/2018
Location: Camarillo, CA
Status: Offline
Points: 272
Post Options Post Options   Thanks (0) Thanks(0)   Quote rang-a-stang Quote  Post ReplyReply Direct Link To This Post Posted: Sep/26/2018 at 8:46pm
Awesome! Thanks, gentlemen! 
Back to Top
Boris Badanov View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Dec/14/2013
Location: NH USA
Status: Offline
Points: 4209
Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Sep/26/2018 at 4:45am
3/8 Cranes fit, 7/16 (if they still make them) do not.
Gremlin Dreams
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: Sep/26/2018 at 1:26am
I'm up close to 600 lift, but with Edelbrock heads if that makes any difference.
I've finally given up drinking for good...........now I only drink for evil.
Back to Top
mixed up View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jun/16/2015
Location: Monroe mich
Status: Offline
Points: 2156
Post Options Post Options   Thanks (0) Thanks(0)   Quote mixed up Quote  Post ReplyReply Direct Link To This Post Posted: Sep/26/2018 at 12:45am
I had Harlem sharp in my 290 with a 540 lift cam and edelbrock aluminum valve covers no problem but an more than that there might be issues
69 amx 290 auto
65 220 290 4spd
80 ford fairmont
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: Sep/25/2018 at 11:35pm
1.7 Harland Sharp works fine for me under the stock covers.
I've finally given up drinking for good...........now I only drink for evil.
Back to Top
rang-a-stang View Drop Down
AMC Nut
AMC Nut
Avatar

Joined: Sep/25/2018
Location: Camarillo, CA
Status: Offline
Points: 272
Post Options Post Options   Thanks (0) Thanks(0)   Quote rang-a-stang Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2018 at 11:22pm
Hey guys, my first post here on theAMCForum. 

Reviving an old dead thread for some similiar help. I am building a 401 for my Jeep. I am looking to add 1.7 roller rockers but want to keep my stock valve covers. I see several of you guys have posted that you have roller rockers under stock covers but are they 1.6 or 1.7? Anyone know if 1.7's will fit? 
Back to Top
348AMX View Drop Down
AMC Addicted
AMC Addicted


Joined: Jul/03/2007
Location: Massachusetts
Status: Offline
Points: 4165
Post Options Post Options   Thanks (0) Thanks(0)   Quote 348AMX Quote  Post ReplyReply Direct Link To This Post Posted: Oct/25/2013 at 11:50am
The rocker ratio also plays a larger roll in those advertised horsepower increases so common in aftermarket aluminum roller rocker marketing.

Most V8's came with a 1.5 or 1.6 ratio rockers stock, and swapping a 1.6 or 1.7 ratio rocker will net greater valve openning so there can be examples of engines that will get 20+ horsepower from higher ratio aluminum roller rockers over stock rockers. In engines that can benefit from the higher valve "lift" when the cam installed isnt optimized are where those advertised gains really come from.

The reduction in parasitic frictional losses dont really add to horsepower increases in a noticeable way at all especially if a flat tappet cam is still used. The camshaft lobe to lifter face contact is the greatest friction load in flat tappet engines.

You can gain 3 Horsepower from using different viscosity oil in some cases. So selecting full roller rockers soley for horsepower gains isnt practical.
Back to Top
amx39068 View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar

Joined: Feb/21/2008
Location: Arizona
Status: Offline
Points: 11576
Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/25/2013 at 10:23am
The 3-5 HP is from reduction in friction movement.  Some additional power however is gained from more precise valve tip to rocker relationship and valve movement but where it really shines is in combination with other modifications like better valve springs, a bigger cam and other modifications that work well together and produce significant additional power which will be otherwise somewhat diminished without the added benefits of the roller rocker. 

Think of it like getting a bigger carb or a performance intake each without the other.  There are diminished benefits for each alone but when you add them together the compounded benefit is multiplied beyond the sum of the individual parts.

For a mild build I use roller tip rockers on adjustable studs.  They are less than half the cost with much of the same benefits as full rollers and work fine with all your other stock valve train components.
Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
Back to Top
badamx View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Apr/04/2011
Location: Middlebury, IN
Status: Offline
Points: 58
Post Options Post Options   Thanks (0) Thanks(0)   Quote badamx Quote  Post ReplyReply Direct Link To This Post Posted: Oct/25/2013 at 9:30am
I thought my buddy's claim of 20-30 hp jump was a little shall I say "optomistic"? I am sure with a more agressive cam and other valve train components combined the cumulative hp bump would be better.

The 390 has low miles and is set up the way it was the day it was born which I found very adequate over the last 5 years of driving her.

Are rollers alone worth the expense and trouble? Or would it be suggested I warm things over a little to make the car more lively?

Like I said my friend is a drag racer so it is his natural inclnation to seek more power. The car is one of 181 as it sets with the Go-Pack 390 4speed and red leather interior. I hate to corrupt it.

I have a 63 Falcon that I am making into a drag car so I can exercise my modification demons with that. Any thoughts?
Back to Top
 Post Reply Post Reply Page  123>
  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 0.219 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