Technical > Matt Shaff's Engine Shop

Rod piston issue SBC

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tcoupekyle:
Sooo the wrist pins won’t fit through the rods because the top of the Rod hits the bottom of the pistons.
This is a problem lol
So moving forward. How does one go about remedying this?
It’s a 434 with 6” aluminum rod and an off the shelf je piston.

THE FRENCHTOWN FLYER:
First thing I would do is measure the thickness of the piston above the rod to see how much material may be removed. Check with your piston supplier on minimum local thickness allowed. I would take material away using a ball nose end mill so there is no sharp edged stress concentration on the underside of the dome. Re balance pistons.

tcoupekyle:
Ooh good idea I’ll call JE TODAY. Thanks didn’t even think about the piston

glofria:
It's been a long time since I've posted here and came across this while killing some time at work.

If you plan on having your rotating assembly balanced, they can take material off of the top of the rod or mill out the bottom of the piston to make it work (before balancing process).

tcoupekyle:
Sooo. Thank you guys for the replies.
Called JE they said the Piston is like .275 thick (don't remember exactly thickness but it's .200 something) and said don't cut the Piston there's not enough meat. So I kept talking to JE to get a piston that would work and maybe a credit on the brand new set I already have. They basically said don't build a 434 blower motor change to a 3.5 stroke crank instead and buy a different Piston..
 
I called lightning rods who make the aluminum rods I have and he says taking a hundred thou off the top of the rods isn't a great idea. But he said he'd trade my 6 inch rod for shorter ones if that helps.

So that's today's breakthroughs

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