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| 63 Valiant getting 4 barrel https://slantsix.org/forum/viewtopic.php?t=49057 |
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| Author: | AHamilton [ Fri Jun 15, 2012 9:17 am ] |
| Post subject: | 63 Valiant getting 4 barrel |
Just ordered an Offenhauser 4 Barrel and carb. I have a 63 Valiant, it has an Offenhauser twin 1920 single barrel carbs. The set up uses a rod set up. I think I heard all I need to do is grab a later model gas petal with a cable style attatchment. |
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| Author: | 65 dartman [ Fri Jun 15, 2012 1:02 pm ] |
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Offenhauser made an adapter kit for the rod style to work a 4 barrel. I can try and scan the instructions and try and post it. |
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| Author: | AHamilton [ Fri Jun 15, 2012 1:04 pm ] |
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Much appreciated |
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| Author: | ceej [ Fri Jun 15, 2012 11:11 pm ] |
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Remind us how much compression you've built, and what your timing curve looks like. Don't remember if your stock or built. Stock isn't going to perform better with the 4 bbl. Built will respond quite well to an appropriate 4 bbl modified with appropriate jetting and transition setup. CJ |
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| Author: | AHamilton [ Sat Jun 16, 2012 5:15 am ] |
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Have never done a compression check. Was told when I bought car a year ago it had about 70K on the rebuild, I bought my convt. already restored. It is a later motor, 5 freeze plugs. I did the basics when I bought her, upgraded to pertronics electronic ign., tune up, all fluids, brakes, most Gremlins. My truck, primary transportation, is getting a new trans. When I get it back, I'm tearing into the Valiant. Already have 8 3/4w/suregrip, 833OD, 66 Barracuda dash, BBP disc brake w/ upper A arm and the pin style caliper adaptor so I get 11.75" rotors. So I have just ordered the 4 barrel intake and 390cfm, I will get the cam, timing chain, and lifters. There are a few things I still need, like the floor hump, better exh, dash pad for the 66, and doodads. I will start with the rearend, brakes, motor, trans. Hopefully over the next year I can get all of it done. Eventually do a full build on the /6. |
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| Author: | Joshie225 [ Sat Jun 16, 2012 9:07 am ] |
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What CJ means is what is your static compression ratio? If you go changing the cam (increasing the duration which causes a later intake valve closing point) you'll need a higher static compression ratio. I doubt you'll like the pin type brake calipers. They steal a lot of brake pedal travel as the calipers rotate around the pin bushings. There are caliper stands to use sliding calipers with 11.75" rotors. |
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| Author: | AHamilton [ Sat Jun 16, 2012 10:11 am ] |
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I don't know my base static compression ratio, the motor was already built. I do not have a degree wheel either. Eventually the six is going to get decked ported/polished all the goodies. The pin style caliper adaptor were the ones recommended in the Disc o Tech article, that is why I went with them. I've seen the sliders available as well. If I don't like the Feel, I'll start looking for the sliders. The twin singles just doesn't have the exhaust note I'm looking for. My other cars usually have big blocks, or small if daily driver. I'm hoping the 4 barrel will make it more throatie. |
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| Author: | Reed [ Sat Jun 16, 2012 10:41 am ] |
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Quote: My other cars usually have big blocks, or small if daily driver. I'm hoping the 4 barrel will make it more throatie.
You are adding a four barrel carb for exhaust noise? Try switching to full 2 1/4 inch exhaust pipe and add a Flowmaster muffler. Modifying the intake side of the motor won't do much to affect the exhaust sound.
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| Author: | Kidd [ Sat Jun 16, 2012 11:16 am ] |
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My wifes 63 has split 2 1/2 exaust w/ a flowmaster per side.....sitting running, sounds like my smallblock Barracuda.Awesome. |
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| Author: | AHamilton [ Sat Jun 16, 2012 11:55 am ] |
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So Kidd, you did split exhaust manifolds and just run them back with flowmasters? Any resonators after? What intake/carb you running. Reed, every car which had a 2 barrel carb and I swapped it for a 4 there there has been a note differance. Not at idle, but when the secondaries kick in or just reving it at park. Maybe not so dramatic on a six, but I haven't had a six since my junior year in HS in 85. I'm not trying make it into a drag car, but the 225 twin single 1940's sounds a hell alot like an imported note to me minus the fart pipe. |
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| Author: | wjajr [ Sat Jun 16, 2012 12:51 pm ] |
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Quote: Maybe not so dramatic on a six, but I haven't had a six since my junior year in HS in 85. I'm not trying make it into a drag car, but the 225 twin single 1940's sounds a hell alot like an imported note to me minus the fart pipe.
That is because most performance cars from the other side of the puddle until recently were powered by straight six engines with two to three carburetors hanging off the side of the engine. That 120 degree firing of a stright six differs considerably from the song of a 90 degree firing V8, and a 120 degree V6. I have a Holley 390, headers, duel exhaust, oversized valve head, ported and shaved for 9.5:1 CR, and a big cam. I cannot hear when the secondary’s open, I can feel a rush come on 4300 to 5600 rpm, but no difference in noise. My car is a rag top, and mufflers are Walker stock type replacement for old Turbo mufflers I installed last year to quite the car down enough so I don’t use ear plugs on a trip any more. A lot of folks think that when my car is idling in gear it has a 340 from the loping cadence of the exhaust. |
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| Author: | AHamilton [ Sat Jun 16, 2012 3:23 pm ] |
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Wjajr: That is a good point about the firing degrees which I had not thought of. It sounds like you have done what I am planning to do, at least in general. You got one of them nice hemi headed sixes with 3 carbs hannging off the side? I've read about them over the past year as I have learned more about this little motor. Don't get me wrong, I have truely learned to appreciate the almost indestructibility of these slanted motors. Everywhere I go, someone tells me stories about there /6 which never let them down, and of course wishes they never got rid of it. Do you know if the hemi headed /6 head will bolt up to a pre hemi /6? |
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| Author: | AHamilton [ Sat Jun 16, 2012 3:26 pm ] |
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Wjajr: sorry the way you were talking thought you were in Austalia until I read again. Oops |
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| Author: | ceej [ Sat Jun 16, 2012 8:16 pm ] |
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The Australian "Hemi" is a completely different engine. The head can't be used on a slant six. CJ |
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| Author: | wjajr [ Sun Jun 17, 2012 4:33 am ] |
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Quote: Wjajr: sorry the way you were talking thought you were in Austalia until I read again. Oops
Think nothing of it. When we lived 20 miles from the loop (Chicago) several folks thought I was from England… the state of New England. Actually I generally reside in the state of Confusion; the 57th state. Below is the current state of my engine bay: 
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