351M/400 PISTONS - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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Old 01-15-2006, 08:59 AM   #1 (permalink)
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351M/400 PISTONS

HELLO ALL. I AM IN THE PROCESS OF OVERHAULING ONE OF THESE MOTORS. I AM STARTING WITH A 400 AND, DUE TO THE PRICE I CAN GET THE REBUILD PARTS FOR (FREE) I AM ENDING UP WITH A 351M, 30 OVER, I THINK. THE PISTONS I HAVE ACQUIRED ARE SUPPOSEDLY THE TRW, FORGED, 030 351M PISTONS, BUT THE NUMBER ON THE PISTON DOES NOT MATCH THE NUMBER I FOUND ON ANOTHER WEB SITE, WHICH I THINK WAS 2466. MINE HAVE L2436 .030 PRINTED ON THEM. ANY IDEAS? I WOULD ACTUALLY PREFER THEY WERE 30 OVER 400s, BUT WHATEVER. THANKS!!!
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Old 01-15-2006, 06:37 PM   #2 (permalink)
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351M/400 PISTONS

An L2466 are a slightly higher CR piston than the stock height L2436.


BTW are you going to use the 400 crank with these pistons?
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Old 01-16-2006, 09:02 AM   #3 (permalink)
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351M/400 PISTONS

NO, I HAVE THE 351 CRANK AND ALL THE O/H PARTS, BUT NOW IM WONDERING IF I SHOULDNT USE THE BUSHED RODS I HAVE AND USE CLEVELAND PISTONS, OR GO WITH THE 400. ID REALLY LIKE TO RAISE COMPRESSION A LITTLE WITHOUT HAVING TO DECK THE BLOCK AND HEADS A BUNCH. I HEARD THE 2466 TOOK COMPRESSION TO 8.6, AND WITH CLEANUP DECK ON THE BLOCK AND HEADS I WAS HOPING FOR PERFECTION, BUT NOW I DONT KNOW. ANY THOUGHTS? I ALSO THINK I CAN FIND A SET OF 2 BARREL SMALL CHAMBER CLEVELAND HEADS, ANY THOUGHTS ON THAT ONE?
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Old 01-16-2006, 10:14 AM   #4 (permalink)
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351M/400 PISTONS

id say if you already have a 400 crank and bushed rods, go with the cleveland slugs. they are probably easier to find than the flat top 400 units. im also building a 400, well i will be soon. also check out http://www.tmeyerinc.com/ the carry flat top 400 pistons as well as other parts.
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Old 01-16-2006, 12:01 PM   #5 (permalink)
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351M/400 PISTONS

OK, NEW SERIES OF QUESTIONS. THE DIFFERENCE IN THE 400 AND 351M IS THE PISTONS AND CRANK TO ACHIEVE A 1/2 INCH DIFFERENCE IN STROKE, RIGHT? SO KNOWING THAT, DO THE 400 AND 351C PISTONS HAVE THE SAME COMPRESSION HEIGHT? OR DO YOU HAVE TO GO 351M? I WOULD LOVE TO BE ABLE TO USE CLEVELAND PISTONS AND GO WITH THE 400+ CID. ANY INFO IS APPRECIATED, I HAVE IGNORED THESE MOTORS FOR YEARS AND FOCUSED ON 429/460S, BUT SETTLING DOWN A LITTLE AND THE FACT THAT I CAN BUILD THIS MOTOR WITH AWESOME PARTS FOR LESS THAN THE 460 CONVERSION PARTS ALONE WOULD COST ME ARE MAKING ME MORE INTERESTED, AND SO FAR IM ENJOYING ALL IVE HEARD. THANKS
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Old 01-16-2006, 06:19 PM   #6 (permalink)
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351M/400 PISTONS

351C pistons had a varying pin height but in general are very close to if not the same as the 400's pin height.
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Old 01-17-2006, 10:57 AM   #7 (permalink)
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351M/400 PISTONS

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Old 01-17-2006, 01:55 PM   #8 (permalink)
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351M/400 PISTONS

OK, ISNT PIN HEIGHT SOMETHING YOU DONT REALLY WANT TO BE "GENERAL" ON? I MAY NEED TO DO MY OWN RESEARCH, HUH?
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Old 01-19-2006, 08:00 AM   #9 (permalink)
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351M/400 PISTONS

ok, got it figured out, the 400 and 351c have a slightly different pin height but not enough to matter. thanks fo all the help
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Old 02-27-2006, 09:09 AM   #10 (permalink)
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351M/400 PISTONS

i dont think these interchange, use 351 pistons in the 351 , you will be slightly past deck causeing some piston head clearance issues ...
i could be wrong but will cause too low compression or the other too much compression (the piston comeing in contact w/ the head) either way not good

<font size=-1>[ This Message was edited by: TelephoneMan on 2/28/06 12:12am ]</font>
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