TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC V8 Engine Repair and Modifications
  New Posts New Posts RSS Feed - 090 Heads
  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.

090 Heads

 Post Reply Post Reply Page  12>
Author
Message
Babycakes View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Feb/24/2010
Location: Henderson, Nv
Status: Offline
Points: 97
Post Options Post Options   Thanks (0) Thanks(0)   Quote Babycakes Quote  Post ReplyReply Direct Link To This Post Topic: 090 Heads
    Posted: Jan/14/2022 at 5:49pm
What amount of lift is possible with 090 heads?
Kind Regards,
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: 3485
Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Jan/14/2022 at 7:21pm
Without milling the top of the valve guide, the limit is right around .500" on a stock head.  You can have any machine shop mill the guide for whatever lift you're running.  Get them set up for positive seals at the same time.

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
Trader View Drop Down
AMC Addicted
AMC Addicted


Joined: May/15/2018
Location: Ontario
Status: Offline
Points: 4047
Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Jan/14/2022 at 8:13pm
JD Payton got cast heads to 0.700" lift. Likely 090's but not positive. 390, 401 crankshaft, dog leg heads, flowed 279/210.
The engine only made 322 HP, wasted $$$.
They changed out the camshaft or camshaft and rockers to something like 0.580" lift, bumped up compression and ended up with a 500 HP engine.
Don't see the point of highest lift except bragging rights.

Back to Top
Babycakes View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Feb/24/2010
Location: Henderson, Nv
Status: Offline
Points: 97
Post Options Post Options   Thanks (0) Thanks(0)   Quote Babycakes Quote  Post ReplyReply Direct Link To This Post Posted: Jan/14/2022 at 10:33pm
Thanks
Back to Top
Hurst390 View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Apr/20/2008
Location: secret
Status: Offline
Points: 4916
Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst390 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 2:03pm
.800 at the valve. 145.11 mph in the 1/4 @2950#
SC/Hurst Rambler

11.62 120

100% Street Legal
Back to Top
Trader View Drop Down
AMC Addicted
AMC Addicted


Joined: May/15/2018
Location: Ontario
Status: Offline
Points: 4047
Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 2:39pm
Give! Bragging rights deserved with iron heads - 620 HP guessing.
Back to Top
Heavy 488 View Drop Down
AMC Addicted
AMC Addicted


Joined: Apr/27/2019
Location: Melmac
Status: Offline
Points: 2521
Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 2:41pm
Originally posted by Hurst390 Hurst390 wrote:

.800 at the valve. 145.11 mph in the 1/4 @2950#

But look at the bragging rights and power you'd have with a smaller cam.LOL
Back to Top
motorhead_1 View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Apr/16/2014
Location: AZ
Status: Offline
Points: 816
Post Options Post Options   Thanks (0) Thanks(0)   Quote motorhead_1 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 4:28pm
depends on how you plan to drive the vehicle, with a street car, it's area under the curve that sees most of the use. max lift hardly comes into play
drag car you can go big lift to brag
69 SC/Rambler tribute 401/th400, 68 Rebel SST LSA, 66 F100 460/c6, 88 Merkur Xr4Ti, 71 Jaguar XJ6 LS1
Back to Top
Trader View Drop Down
AMC Addicted
AMC Addicted


Joined: May/15/2018
Location: Ontario
Status: Offline
Points: 4047
Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 5:08pm
Back on topic, impressive Hurst. 
Rough go at the math, 300 CFM 64 cc well worked heads, running 14.5:1 to 15:1 SCR, 13:1 DCR, 104 LC cam 240 to 250@0.050, flat top pistons, stroked 390/401, at least 0.030" over and more likely 0.45" over, valves clear the pistons quite well (surprised at this), shifting at 6800 RPM.
Shot of nitros 4500-5000 RPM? Likely the need for the 0.800" lift otherwise it would not be required.
Would not recommend this for a street build.
But for it's intended purpose, well built!
Back to Top
Babycakes View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Feb/24/2010
Location: Henderson, Nv
Status: Offline
Points: 97
Post Options Post Options   Thanks (0) Thanks(0)   Quote Babycakes Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 11:53pm
i have a Crane Hyd. Roller with .542 Ex. lift.  Just wondered if I could use it.

Back to Top
 Post Reply Post Reply Page  12>
  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 0.094 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