What stall converter for my 408 stroker

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I have used 3 Precision of New Hampton converters in my rides over the last decade. They were all amazing, not inexpensive, but some of the best bang for the buck you can buy.

I was running a 2004R in my '68 with a 3700 rpm stall and a 3 carbon fiber disc lock-up clutch. I wired the transmission so I could lock or unlock the converter in 4th gear. Unlocking it at 65 mph would add only 350 rpm versus locked up.

As mentioned above, when using heavy throttle the converter would flash to 3700 rpm. Around town, you couldn't tell it from a stock converter.

200R4 3 (Medium).jpg
 
I've got a similar engine in my Dart. 408 stroked magnum. I've got a little bigger cam and edelbrock heads. I have 3.55 gears with full weight, full interior, street car. I called PTC and they spec'd and built me a 3800 stall. I've put a bunch of street and highway miles on it without issues. I hauled the family 2 hours to the drag strip and ran 11.50s all day and drove home.
 
4mulas said:
You’re also right about converter technology. I think a lot of dudes like to buy off the shelf for instant gratification and cost. Me too mostly on the cost end of things. If I was ever happy with anyone of my cars and didn’t want to change things up as often as I do I would also likely buck up for a ‘made for me’ converter to suit the exact setup too.

The converter I have now is a billet job (the 2800 one I mentioned earlier) was made to go behind a massive torque 505 big block that I had on hand so I used it. I didn’t know what it was good for and just tried it, luckily it was close enough to my needs but truth be known for my current setup I’d probably like something around 3200rpm, maybe 3300
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I remember when we were kids, we'd put a four cylinder Vega converter behind a hot big block. We thought we had something. LOL
 
jbc426 said:
As mentioned above, when using heavy throttle the converter would flash to 3700 rpm. Around town, you couldn't tell it from a stock converter.

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Precision is a great company. And no matter how many times you tell people a high flash stall will drive around like a stock converter they slam will not believe you.
 
I have a much milder build than you in a 5.9 magnum with 3.55 gears in a street car. I tried two of the major converter companies mentioned and never got a call back. Someone here recommended Edge Racing Converters. Andre is a Mopar guy. He built me a custom 3200 stall converter at a very reasonable price. Very happy with it.
 
RustyRatRod said:
Precision is a great company. And no matter how many times you tell people a high flash stall will drive around like a stock converter they slam will not believe you.
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I agree! I have an 8" PTC in my '67 D100 and it is like stock converter until you nail it. I even pulled my son's '88 short bed with it with no problems.
 
408 here. Built a tad more serious. 3500 stall. When I 1st spoke of that converter choice here (years ago) I think 90% of the respondants told me that I would need more stall.

I left it at 3500, but would probably go with more stall now that I have confirmed that 3500 is nooo problem.
 

matt030305 said:
Hey FABO,
I was wondering what stall converter I should get for my 408 Stroker build. This will be a mostly street driven car so I need something that can cruise and be fairly street-able.

Here’s the cam going in it:
Duration at 050 inch Lift:
236 int./242 exh.
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matt030305 said:
I have 3.23s in the back but will be upgrading to a more radical gearing. I got 245/60/r14s in the back. I need it to be as streetable as possible since i want to be able to cruise on the highway without burning up my transmission. Thanks
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I used to run a Hughes Engines HE3844AL hydraulic flat tappet cam (238/244 @0.050") in my 360 motor. Initially 3.91 gearing, but the sweet spot for my 3600 lbs ride was 4.10 and that's with a 9.5" 4K stall Dynamic converter.

My point being: with that cam (looking at duration @ 0.050") 3K stall is too little. I started with 2800 actually and that was a dog on the bottom end (was running a Performer RPM intake too).
 
Every time I see one of these TC threads, I read them and watch what others post about their experiences. I wish some doubters were local to me and could go for a ride in the avatar when we take it to a cruise or show. Yep, 5000 rpm flash stall and in Florida heat. It has its own tranny cooler and runs in the 160-180 range on the street (and track!). I believe nobody would complain about or notice this high-stall TC until the loud pedal is mashed. And then they would only grin from ear to ear!

Not everybody needs 5000 stall. But don't undersell yourself that a high quality, higher stall converter really is a great piece for a street car!
 
matt030305 said:
Hey FABO,
I was wondering what stall converter I should get for my 408 Stroker build. This will be a mostly street driven car so I need something that can cruise and be fairly street-able.

Here’s the build:
-01 magnum block
-Hughes 360 girdle (w/ARP main studs)
-scat 4340 forged 4.00” crank
-scat 4340 I-beam rods with ARP bolts
-icon forged dish pistons (~10.5 CR with 60cc heads)
-Trickflow 190cc heads (TFS-61417802-C00)
-cometic head gaskets
-Harland sharp 1.6 ratio roller rockers made for magnum blocks (pushrod oiling)
-edelbrock RPM air gap (gasket matched)
-Holley 750cfm with electric choke and vacuum secondaries

Here’s the cam going in it:
Duration at 050 inch Lift:
236 int./242 exh.
Advertised Intake Duration:
286
Advertised Exhaust Duration:
294
Advertised Duration:
286 int./294 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.544 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.541 in.
Valve Lift with Factory Rocker Arm Ratio:
0.544 int./0.541 exh.
Lobe Separation (degrees):
110

I have 3.23s in the back but will be upgrading to a more radical gearing. I got 245/60/r14s in the back. I need it to be as streetable as possible since i want to be able to cruise on the highway without burning up my transmission. Thanks
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I wouldn't buy the gridle and put that money toward the converter.

I also think it's got too much compression if you want cruise it longer distances on pump 91/92 gas. Needs to be under 10.0 CR
 
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