I plan on installing the following /6 into my 69 valiant:

super six
dutra exhaust(run duals all the way out?)
9.25-1 compression
Erson 280/270 cam installed +4
1.72 intake 1.50 exhaust
Hughes roller chain and Smith Bros push rods.
904 auto
8 3/4 rear end

I was looking for a suggestions on torque converter and gearing

thanks

Race car, daily driver or a little of both?

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Weekend driver for the most part, there is a track less than ten miles from me, but more than anything just want to drive it to work some, and a trip around the area on the weekend, while trying to harass the occasional import.

I would use at least a 3000 stall 10" converter and a 3.91 gear.

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I would run duals back to the transmission cross-member area and then Y them together into a single pipe.

I would also use a larger carburetor.

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Joshua

...and more compression (that stick likes it up past 9.5 to 10:1 and higher on the rpm band).... and maybe index at +6.... and port the head so those valve sizes don't go to waste... duals per Josh's recommendation....

390 cfm holley or 500 cfm for daily driving.... 500- 600 cfm for racing....

3.23 daily driving would be OK.... my car really liked that setup with 3.55's even with the OD gear...

EI and recurved distributor is a must

small 4 barrel, more compression ratio, porting, large valves, per your post should ring in about 190hp at the crank...with Dennis's gearing and TC, 16's in the 1/4 for a not so sorted out car...closer to high 15's once you get everything dialed together or better....

If you did it right, the car will feel like a peppy 318....

I like your buildup specs quite a bit. Dennis has got the combo there - 3000 stall and 3.55 or 3.91 gears. The Holley 500 2bbl is a great street/track carb for your kind of combo. Some head porting, at least in the bowls, would be advised as well, as DI said.

Best,

Lou

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Home of Slant6-powered fun machines since 1988

Thanks for all your suggestions. I appreciate them and will use them.

Austin

With all due respect to those posting suggestions, you can't possibly determine a good gear ratio without knowing how large your tires are.

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1970 Plymouth Duster, 198 Slant Six, Super Six setup w/ EI conversion

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