4.6 pistons

well i was given a set of 4.6L pistons and rods out of a motor. these look to be forged to me (came out of a mustang...year unknown)

they are a bit loose of a fit in my 200 block but the price was right. so since these are closer to a 170/144 bore anyone interested in trying these out? they are a super short skirt design so you will need longer rods for sire (I am guessing 3/8" or so longer)

also was given an oil pan off a 4.6L....looks to have some nice looking baffles spot welded in it.....well those are coming out and the rest is hitting the scrap pile or is become a parts washing bin.
 
well they were free.....

but it got me looking at piston/rod combos.....

looks like a stock 302 rod at 5.090" on a short piston could be a hot setup but would be a stupid short pin height of about 1.220"

but it seems alot of the smogger motors have an oversized block that runs a little on the tall side....so maybe a little could be gained there (maybe even a little piston top sticking up in the bore .020-030") so maybe one could pick up .070"- .080" height and reduce the quench band at the same time. so this would put you in the 1.280-1.300" range...not too shabby like then...

using the 302 rods would keep that cheap and the big cost would be the custom pistons to make it all work out....but that won't be such a big deal if you are talking custom forged slugs anyways..
 
The biggest problem with trying to use "off the shelf" rods is the big end width.
Our 6's use a width of .995" and most of the V-style motors use .940".

I've got a set of H-beam Manley's for a 4.6L that'll fit our 250 perfectly.....except for the big end width.

Might try a friend who can weld 4340 forgings and then machine them down to fit.

Later,
Will
 
8) the rods are actually a powdered metal that is vacuum cast. they work well, but are not really the best ones to use. they use a cracked cap design that doesnt lend itself to being able to resize the big end of the rod because it uses the uneven rod cap surface to center the cap on the rod.

the pistons can be used as long as they fit the bore.
 
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