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Originally Posted by farmallmta
Hi, new member here. I don't have a Cobra yet, but I'm in the planning stages for one. I'm really into the FE engines, and have a fair amount of experience with them in pickups and full size Fords and Mercs.
My question about the 406 piston issue is: are rods available to connect 428 pistons in a 428 block to a 3.78" stroke crankshaft, thereby creating a late model FE 406. The 406 has some really good attributes pointed out in other member comments, including quick revs and peppy acceleration.
Are any rods available to solve the 4.13" cylinder bore with the 3.78" crankshaft throw?
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I think this was stated, but I'm not sure it was clear. The 406 and the 428 both have a 4.13 bore with the same deck height block and same length rods. Therefore to change strokes back and forth all you need to do is use the correct pistons for that stroke (406 pistons for 3.78 and 428 pistons for 3.98 stroke).
There were a few years that Ford did use a slightly different rod length and deck heights on some FE engines, but I didn't bother to check for specifics since I don't know that info. However anyone doing a build should be on the look out for these minor differences.