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Which Cam for my AMC 390? |
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ScrambledEgg 
AMC Nut 
Joined: Nov/24/2007 Location: Upstate NY Status: Offline Points: 348 |
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 Posted: Jul/23/2015 at 5:41pm |
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+1 I chose the Comp Cams 280 for my stock SC/R other than forged Auto Tek 10:1 pistons and roller rockers. |
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ScrambledEgg
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raysinvegas
AMC Addicted
Joined: Jul/01/2007 Location: Las Vegas NV Status: Offline Points: 2501 |
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Posted: Jul/23/2015 at 5:58pm |
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Andy Ray
64 440H 64 440 Convertible 68 Javelin SST 343 69 Javelin SST 343 69 SC/Rambler 
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jimd
AMC Apprentice 
Joined: Jan/01/2009 Location: Oneida, NY Status: Offline Points: 158 |
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Posted: Jul/23/2015 at 6:09pm |
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I've got the airgap in my 401. Works great. I've used the bigger summit can (can't remember #). Nice cam. The 10.2 compression will work perfectly on 93 octane.
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bikerfox
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4464 |
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Posted: Jul/23/2015 at 11:14pm |
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The bigger summit cam is the 8601, which is the cam I'm running. There are a variety of ways you can go with the intake and if you do some searching on this forum, there are several threads addressing this subject. For higher rpm get up and go, I use a torker intake.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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grparen
AMC Apprentice
Joined: Jan/02/2008 Location: Texas Status: Offline Points: 177 |
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Posted: Jul/27/2015 at 10:39am |
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Can I use the Comp Cams 280H cam with stock intake manifold and stock exhaust manifolds or do I have to go with an aftermarket intake and headers?
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Gary Parente
1969 S/C Rambler B Scheme 1964 American 330 2 Dr Sedan |
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Sonic Silver
Supporter of TheAMCForum 
Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7949 |
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Posted: Jul/27/2015 at 11:12am |
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bcsideshow
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Joined: May/19/2010 Location: Kenosha Status: Offline Points: 1228 |
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Posted: Jul/27/2015 at 11:19am |
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I've got the comp 280 in my 70 390 and love the sound and performance.
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1969 SCRambler "B"
1970 AMX 390 Auto 1968 AMX 390 Auto 1970 Rebel Machine Project 1969 AMX 390 4SPD Project 1969 AMX 390 Auto Project 1969 Javelin 390 project 1997 Cherokee lifted 1998 TJ Lifted |
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ScrambledEgg
AMC Nut
Joined: Nov/24/2007 Location: Upstate NY Status: Offline Points: 348 |
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Posted: Jul/27/2015 at 5:23pm |
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Only use headers and an aftermarket intake if you want to take advantage of the extra cam duration. If you just want to listen to it idle roughly, leave the rest alone. It won't be any faster.
+1 what they said. My car is all stock including the smog pump and antibackfire valve in place (except smog is internally bypassed - but functioning visually). People go crazy hearing the rough idle with the smog system still in tact. Exactly the mark I was shooting for sound wise and visually. More bling comes when they see the original AM part numbered R4B and Old school NOS Crossram sitting on display next to the car. Whoever said you had to actually install them to make people drool? .....me thinks its more of the 'resistance' to modify that people appreciate.......... while at the same time the rough idle gets them thinking about the juicy temptation of deviating from how it was delivered. |
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ScrambledEgg
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uncljohn
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Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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Posted: Jul/29/2015 at 8:51pm |
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Of course you can use the Comp 280H with OEM intake and Exhaust. It has a bit more duration that is easy to tune with, but that may not be a problem. The advantage of aftermarket parts is largely that of higher rpm applications, but face it, the car is a hobby car and if you were determined to take advantage specifically of the high rpm advantages, you would not be asking if you need to change things out.
I personally am not a big fan of street headers and consider them a waste of money from a performance standpoint for the value received for the dollars spent. By the time you buy them, get them installed and plumb them it is a ton of money spent for not a whole lot of return. A nice dual exhaust with an H or X pipe system takes the blatt of things and the sound is good. Intakes have advantages, some are better than OEM and some are not a whole lot different when it comes to street use. But that is up to you. Personally I like an air gap intake, but that is my choice. You might consider something with less duration but what you have chosen can be tuned and civil in traffic. I am using on one engine a cam with 270 duration and like it. On another engine a split duration of 270/280 and it looks like I can dial in my idle to something in the area of 650 rpm and about 8 inches of mercury and still get an instant throttle response. Besides at lower rpms, the OEM exhaust sort of negates the duration. So it should work. Up to You! |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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billd
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Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Posted: Jul/29/2015 at 8:59pm |
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Right - read the info on that cam. If you have an automatic they strongly suggest a higher stall converter, they also recommend an intake, headers and a lower gear ratio. It's a strong cam. It will impact accessories like power brakes, vacuum operated heater controls and such because it has enough overlap to drop vacuum appreciably. It's what is in my 73 and it's got dual quad intake with 2 Edelbrock carbs, headers, 2500 stall TCI converter, etc.
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