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Drilling vac advance port |
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ridler3d
AMC Apprentice Joined: Nov/07/2009 Location: florida Status: Offline Points: 186 |
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Posted: Feb/08/2016 at 3:17pm |
Hello all...ive been working on the hornet all day today, set base timing @ 8* BTDC in gear and vac advance plugged. It was at 4*, so im feeling good about the change.
Now...ive been running my advance from manifold vacuum and would like to change it to ported so that im not waayyy advanced at idle as i probably am now. Problem is advance port on the pass side of my carb is blocked. It looks like they casted a place for the hole to be drilled and fitting added, but thats it. The hole is a dead end. Maybe this particular carb was not supposed to run a vac advance? Either way im thinking about drilling straight through to the carb throat and adding a fitting to the casted hole. Can anyone give some advice on how large the hole should be? |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Don't know if you are missing the spacer... my 73 had a carb spacer with both PCV at the back and ported at the front. Not sure about your year following the same. There are a few members who know about your year than I.
Give them a chance to give more info before you drill. Oh you stated you swapped engine, so letting us know what year engine you are running may help on understanding any differences for hookups with what you got. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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ridler3d
AMC Apprentice Joined: Nov/07/2009 Location: florida Status: Offline Points: 186 |
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ridler3d
AMC Apprentice Joined: Nov/07/2009 Location: florida Status: Offline Points: 186 |
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Scratch that ive got a good place for this little bastard...the trash can
Wish i had the cash for a mc2100...looks like ill have to figure out how to put my YF on this manifold.... |
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amc401t10
AMC Addicted Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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2100s Are cheap, I gave a member 20.00 for mine,14 for a kit,
another 28 for the adapter,trans dapt , it runs great. U do have to do some fab work on the gas linkage, I cut the arm of the carter and welded it to the 2100 . This is what amc should have used!!! |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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ridler3d
AMC Apprentice Joined: Nov/07/2009 Location: florida Status: Offline Points: 186 |
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I was reading the trick is to find the 2100's with 1.08 venturis instead of the more common 1.21
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Glad it worked out for you... I do recall them 2100 carbs do need a rebuild kit every 15 years or so. Both 304s had near empty bowls after sitting. Though once done right, they are good runners. I rather use the more common sized venturi as you get a wee bit more performance and easy to find. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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firefly
AMC Nut Joined: Dec/23/2008 Location: wi. Status: Offline Points: 355 |
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ridler3d
AMC Apprentice Joined: Nov/07/2009 Location: florida Status: Offline Points: 186 |
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1.21 it is then...thx guys
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ccowx
AMC Addicted Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
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If you are thinking of using a spacer, that will give manifold vacuum, not ported. I am assuming when you say spacer, you mean an undercarb spacer similar to the ones in a 70 V8. Ported vacuum comes from the carb venturi ABOVE the throttle plates.
Chris
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