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LS to AMC rocker conversion |
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73hornut 
AMC Addicted 
Joined: Jul/03/2007 Location: Southern Oregon Status: Offline Points: 3130 |
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 Posted: Feb/27/2015 at 10:27pm |
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71 Javelin
74 Gremlin 79 Spirit AMX Rogue Valley Rumblers Like Us on FB https://www.facebook.com/groups/1602825606650796 |
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Hurst390
AMC Addicted
Joined: Apr/20/2008 Location: secret Status: Offline Points: 5818 |
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Posted: Feb/28/2015 at 11:33am |
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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jcisworthy
AMC Addicted
Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Posted: Feb/28/2015 at 12:11pm |
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The LS rockers use an 8mm bolt where I used 5/16 cap screws to screw into the existing AMC thread on the bridge heads.
There is not much room to make the hole in the LS rockers larger, 3/8 maybe on the high side. A lot depends on the thread size in the 4.0 heads and the valve guide spacing. If the spacing is between 1.900-1.930 center to center and the threads are 5/16 there is a good chance the LS valvetrain may work.
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amc67rogue
AMC Addicted
Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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Posted: Feb/28/2015 at 12:25pm |
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All Gen.2 & 3 v8 199 thru 258 4.0 have the same valve spacing. IIRC the Gen 1 250-327 is the same as Gen 2 & 3.
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Keith Coggins 67Rogue X code
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xspiriment
AMC Nut
Joined: Apr/27/2009 Location: New Mexico Status: Offline Points: 379 |
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Posted: Feb/28/2015 at 2:56pm |
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Thanks for the replies for the 4.0. The 4.0 uses the same bridged rocker assy as the v-8 so i think it will work. i have to try this when i work on a 4.6 stroker in my future. To many projects right now.
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Aljav
AMC Addicted
Joined: Jul/18/2007 Location: Wisconsin Status: Offline Points: 1037 |
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Posted: Mar/01/2015 at 9:58am |
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If memory serves me right the 6 rocker arm has very different dimension than the 290-401 rocker arms,
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69 AMX 9.86 132 mph 71 JAV/AMX and 69 Javelin, .. NAMDRA member #1106
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gschuld
AMC Fan 
Joined: Feb/09/2014 Location: Toms River, NJ Status: Offline Points: 2 |
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Posted: Nov/24/2016 at 10:02am |
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Any updates on this?
George |
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5spdwagon
AMC Addicted
Joined: Jun/29/2012 Location: Guy ton ga Status: Offline Points: 522 |
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Posted: Dec/21/2018 at 3:25am |
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I bet this is a awesome upgrade for the ones who have the talent to make it happen
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Real hot rods have 3 pedals
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Brad
Supporter of TheAMCForum 
Joined: Aug/07/2016 Location: Canada Status: Offline Points: 433 |
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Posted: Dec/21/2018 at 1:02pm |
Thanks for your posts on this. Do you think these would work ok? Any idea if the stock valve covers will still fit? https://www.jegs.com/i/Speedmaster/746/PCE261.1092/10002/-1 After asking customer support at Jegs, these are adjustable? 1.7 ratio
Edited by Brad - Dec/21/2018 at 1:27pm |
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jcisworthy
AMC Addicted
Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Posted: Dec/21/2018 at 1:26pm |
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I have switched to the style in the link for bridge heads
I may do a thread on what it takes to use them when the 304 I am building goes together |
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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xspiriment wrote: