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farna 
Supporter of TheAMCForum 
Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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 Posted: Aug/11/2021 at 6:41am |
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I'm with Buzz. With the cam you have 14 is probably normal. That's why some high lift/high duration cam cars being run on the street need electric vacuum pumps for power brakes. 16-20 is normal for a stock/mid range performance cam.
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Frank Swygert
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1BadJav
AMC Nut 
Joined: Mar/07/2008 Location: Las Vegas, NV Status: Offline Points: 342 |
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Posted: Aug/11/2021 at 12:05pm |
That is what I thought as well, but, not knowing the cam specs it is hard to know for certain. As far as the plugs go. 6 of them were a nice light ash color and 2 of them were considerably darker.
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72 AMC Javelin SST - 401/727
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javtopgun
AMC Nut
Joined: Aug/03/2021 Location: NV. Status: Offline Points: 342 |
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Posted: Aug/11/2021 at 12:40pm |
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K , after you left badjav , i did a deep dive into the abyss ( internet ) and found the spec's on the cam .
480/480 lift 270/270 duration lobe seperation 110 intake/exhaust at 050 inch lift 224
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1968 Javelin SSt 343ci semi restomod .
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javtopgun
AMC Nut
Joined: Aug/03/2021 Location: NV. Status: Offline Points: 342 |
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Posted: Aug/11/2021 at 12:57pm |
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also had some notes
recomendations for an amc application Slightly higher compression ratio than stock. my original valve cover tag indicated a 9:1 compression 343, per what builder said i have 9.5:1 Higher rear end gear than stock . its not its 3:15 Higher stall torque than stock , i have no ideal what stock converter ratio is but its stock . i seen some things in the abyss ( internet ) saying its 1600 but im not sure ! U all im sure know . Sounds like to me i need a jeep 3:31 rear gearing and stall converter some where between 1800 and 2200 . dose that converter even exsist ? And am i on the right track ? |
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1968 Javelin SSt 343ci semi restomod .
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javtopgun
AMC Nut
Joined: Aug/03/2021 Location: NV. Status: Offline Points: 342 |
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Posted: Aug/11/2021 at 1:09pm |
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No issues with the power brakes really except i did a conversion to disc front from a 71 jav ( all front end components , disc power booster and master cylinder . but have not put a disc prop valve in the line , just have the pressure differential switch from the drum brakes . it a 50/50 split but in a tread in suspension im told leave it ( diff switch ) and put a disc prop , maybe adj in line to bring that down to 70/30 or even 80/20 to stop all 4's from locking up at same time making it a straiter more controllable stop ( stop rear end kick out ) i also thing the 50/50 i have now is stoping the rear tires from braking loose on a power torque ??
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1968 Javelin SSt 343ci semi restomod .
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farna wrote: