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Author
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Topic: Need help identifying this tq converter!(C4)
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Rustang
Journeyman Posts: 42
From:
Registered: Nov 2000
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posted 06-23-2001 04:21 PM
  
I've got this torque converter that I'm trying to identify. This much I know: it is an 8" ATI #H240033 for C4. The bolt pattern is 11-7/16" for the large flex plate, the nose measures 1.845" diameter. When I bolt the converter up to a stock 164 tooth small block flex plate, the nose of the converter is about 1/4" shy of engaging the engine crank (small block). So here's what I discovered, the nose doesn't stick out enough to engage the crank, and even if it did, the diameter of the nose is too large for my small block. I was told this converter was run on a small block, but I don't think it was. 
Is the standoff from the flywheel mounting face to end of the nose bushing shorter for a big block converter? or do I need some sort of nose adapter? or do I need a special flex plate and nose adapter? I'm planning on calling ATI Monday but I this is really bothering me!
thanks in advance------------------
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Dave_C
Gearhead Posts: 256
From: Gadsden, Al
Registered: Aug 99
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posted 06-24-2001 10:56 AM
I think what you have is a converter for an FE engine. I think that is the correct size (or close ) for an FE crank. The correct crank pilot size for a 289-351, 335 or 385 series engine is 1.375If it slides into a C-4 and engages the splines it may have been from a custom race application. I have seen SS racers use an adaper plate to bolt a C-4 to an FE in an affort to use every last bit of power. Later, David Cole
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Butch Jennings
Gearhead Posts: 199
From: California
Registered: Apr 2000
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posted 06-24-2001 01:33 PM
I've seen some 385 series engines that had a big pilot hole in the crank also. I think it might be the early motors....my '71 crank has a big pilot, in fact, I used the same convertor pilot adapter on it as I did with my FE's.------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"
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Rustang
Journeyman Posts: 42
From:
Registered: Nov 2000
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posted 06-24-2001 05:20 PM
I measured the pilot of a 460 crank I have lying around and sure enough it does measure close to the 1.845".  ------------------
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Moneymaker
Administrator Posts: 8560
From: Lyons, IL, USA
Registered: May 99
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posted 06-26-2001 12:33 AM
Ditto on the big block C-4 converter application. It can be re-configured to a small block pilot cover for a nominal charge.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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Rustang
Journeyman Posts: 42
From:
Registered: Nov 2000
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posted 06-26-2001 09:06 PM
Called ATI and it definitely has a big block pilot. Also, this converter has a screw on pilot so they can be interchanged. Mine has it, but someone welded it fast! So I'm going to take it to work tomorrow and try die grinding out the weld and see if I can get the bushing to come off. They also said that the 1.375 bushing is longer, so that answers my standoff question too. They have new bushings for around $40.00. Plan B is if I screw it up, I'll send it back to ATI and they can put on a new front plate with correct nose and bolt circle. It'll cost me though!
Lesson learned! (I hope)  ------------------
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Moneymaker
Administrator Posts: 8560
From: Lyons, IL, USA
Registered: May 99
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posted 06-27-2001 06:55 PM
Good luck.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
IP: Logged |
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