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amc 360 build |
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hohner0006 
AMC Apprentice 
Joined: Jun/10/2016 Location: south dakota Status: Offline Points: 49 |
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 Posted: Apr/19/2021 at 7:09pm |
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Just curious...how much do you "change" the cam dynamics/performance when going from a 1.6 rocker to a 1.7? What do you gain and what do you lose?
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matty 401
AMC Addicted 
Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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Posted: Apr/19/2021 at 8:37pm |
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gain lift does not change anything else
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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Trader
AMC Addicted
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Posted: Apr/20/2021 at 8:16am |
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Adding ratio increases lift but also changes the ramp ratio. Your #@0.050 will also increase. Think of this as a hybrid between a solid lifter vs roller camshaft gain on the valve lift but not the reduced friction at the camshaft/lifter interface.
Roller rockers with the increased ratio is normally the way to go as the rocker also see increased forces. And of course you need springs to accommodate the extra lift.
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Hurst390
AMC Addicted
Joined: Apr/20/2008 Location: secret Status: Offline Points: 5818 |
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Posted: Apr/20/2021 at 3:03pm |
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On a mid 9 sec 1/4 mile car I picked up about 1mph with a change to 1.7
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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wrebelmachine
AMC Apprentice
Joined: Aug/08/2019 Location: SW Missouri Status: Offline Points: 162 |
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Posted: Apr/23/2021 at 8:59am |
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I will throw this out there. There is a guy here that has a jeep grand wagoneer and he has a Erson TQ20 cam in it. That thing is really strong for such a heavy ride. It gets up and goes really good.
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Sonic Silver
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Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7949 |
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Posted: Apr/23/2021 at 9:12am |
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AMXFSTBK390
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Joined: Oct/22/2013 Location: SF Bay Area Status: Offline Points: 3489 |
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Posted: Apr/23/2021 at 11:36am |
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What is the stock AMC 360, 390, 401 rocker arm ratio,... guessing 1.5 ratio?
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Questions are powerful tools...what's in your toolbox?
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kmoree2141
AMC Fan 
Joined: Feb/02/2020 Location: AL Status: Offline Points: 15 |
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Posted: Apr/23/2021 at 11:39am |
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i am searching for ANY amc 360 cam everyone is out of cam stock//// used, new. if it is grindable
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Sonic Silver
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Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7949 |
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Posted: Apr/23/2021 at 11:42am |
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kmoree2141
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Joined: Feb/02/2020 Location: AL Status: Offline Points: 15 |
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Posted: Apr/23/2021 at 11:50am |
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what kind of valves lifters come in a factory amc 360 were they hydraulic lifters, flat tappits i am attempt mechanic
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wrebelmachine wrote: