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Old 03-01-2010, 10:02 AM
aallison aallison is offline
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Join Date: Jun 08, 2007
Location: NE Florida
Posts: 515
401 Piston thoughts?

I'm building the motor for torque. I want a good dd, reliable and as fuel efficent as I can build a 401 and still get good torque. I want to run on pump gas. Mid grade gas if I can with no knocking. I might change the cam once I figure out what I have in there right now. Heads are stock 3320502, but have been cleaned up inside the runners. Performer intake, Doug Thorley Try Y headders. I'm thinking of Truck Avenger carb. Leaning towards a TFI ignition. Stock crank and rods. I was thinking aobut the KB pistions but I'm not convinced. I kept looking.

Anyway, I've found these pistions. I think these are the same pistions. BUt they are from the same company.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=380203455690&ssPageNam e=ADME:X:RTQ:MOTORS:1123

I sent and email and the response is below.....
Dear aallison28,

You asked the following question:
----------
Question:
I am looking for a set of AMC 401 pistions, .030 oversize. I tried to find more information on your website but I can't find the AMC pistions.

--------------------------------------------------------------------
ERW
Sir,
We show a set of PST2380A which are a exact copy of the L2380F from TRW/SpeedPro. These are a csast pistons from Rebuilders Choice. Diamond turned, weight matched, CH of 1.505, dish of .170, pin size of 1.007 press fit, ring lands are 5/56th 5/64th 3/16th and shows a compression of 10.56:1 @.030 w/ 50.6cc head. Now we show a ost of $264 on the set, rings are $41 cast and $62 moly. Give us a call if we can make a package deal on internal parts for you, Thank you Anthony 1 800 940 4379 #403

- hd_mad_dog


Anyone got any experience with these pistions? I thought the stock pin size was .975. Will these pins fit the stock rods? Cast or moly rings? I'm thinking cast. And with the 502 heads, I understand the CR will be around 9.5 to 1.

Any help or thoughts would be appreciated.

Last edited by aallison : 03-01-2010 at 10:16 AM.
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  #2  
Old 03-01-2010, 10:17 AM
Ristow Ristow is offline
 
Join Date: Jan 20, 2006
Location: The Great Googley Moogley Midwest.
Posts: 17,022
i'm looking at the same set,thinking i'll go for it. stock pin is a few though over an inch for the press fit.
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  #3  
Old 03-03-2010, 08:46 AM
aallison aallison is offline
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Join Date: Jun 08, 2007
Location: NE Florida
Posts: 515
Some info on the TRW/Speed Pro pistons that are susposed to be the same as the Mad Dog one's.

Recessed head .170" with 4-valve relief. Press pins included. Ring dimensions 5/64 5/64 3/16. Compression ratio 10.56:1 @ 50.6 cc & 9.8:1 @ 58 cc. Compression distance 1.505.

I think I'll go with the cast rings..........

I'd like to hear what Ristow thinks about his............

Any other thoughts from anyone?
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