Thanks to all the great info on this forum my new build is running on the stand!
Just want to choose the best stall converter on the edge of street/highway driving & the odd trip to the track. '73-74 engine; head ported & polished;1.70&1.44 valves; roller tip rockers 1.6 Int. 1.5 Exh.; Erson 280/270 cam 108 LSA installed @ 4.75 deg advanced; .030 pistons with rotating assembly all balanced; block & head machined to 10.3 SCR/8.4 DCR (measured);
Holley 390 4BBL; Clifford heated intake w/shorty headers 2" dual exh. w/X-pipe;
GM HEI conversion; NGK ZFR6FIX-II plugs; dist. recurved w/ initial 14 deg.; mech starts @ 1300-1350 rpm, vac starts 2300, total advance 53 deg. @ 2650-2700(have another dist. to try if curve is not good);904 auto; '70 Duster should be in the low 3000 lb. area????; 3.23 -8 3/4 posi. Now using the calculator links, 65 mph w/25.5" tires, puts me @ 2766 rpm. Would 2700 stall work or is it to close?
How much heat would build if a guy was @ 50/60 mph for a while? Who is the best @ the moment, Midwest, Edge Racing, or....? Thank You in advance for all input,

DARKDUSTER

As you know,
You want the converter to not slip at your highway crusing RPM.
We also know that the stall ratings we often see are usually for V 8 application and will usually stall 200 to 400 RPM lower when used behind a SL6.
With that said... a conservitive choice would be a 2800 - 3000 stall converter.
next choice... 3000 to 3200 range.

Many other factors come into this decision like the coverter's shell size and your willingness to "work with" a high stall unit, during street use.
DD

All I can add is a recommendation for Midwest, only it's not exactly current info. Several years back I asked them if they could build something for an oddball combo I was building and they responded with a converter that would 'flash' somewhere around 2800-3k (depending on track tune etc) on the same slicks I used on the street for god knows how many miles where it would stay tight on the highway at 2600. It took some heinous beatings under a 4200lb slug that whole time with nary a hiccup. Couldn't be happier for $425 almost ten years ago and I think it was a major contributor to that pig's 12.60 et's.

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1966 Coronet Deluxe

If it were me, I would call Midwest on the phone. Tell them your engine/car setup and ask for 2800-3000 stall in a 9.5" converter. I have had great luck with them and prices will not be beat. They have made a large number of Slant converters. I have heard Edge is also very good.

2800-3000 may sound high, but the new converters (post 1980s) are quite efficient until you stand on it. I have run up to 3600 stall on the street and even cross country and on road courses and had no heat problems. I always run a trans cooler (around 8-10" X 12"). You will lose in the range of 0.5-2 MPG on the hwy compared to a stock converter.

Lou

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