8BA piston install

stegomo

stegomo

Junior Member
I know the piston pin is offset but there is no mark on the pistons to indicate which way to install. there is an oiling slot on the skirt, does it go up (intake side ) or down (exhaust side )?
 
Not all piston mfrs make the flathead pistons with an offset on the wrist pin. If there is no marking, this generally means it can be installed either way. If it has the mark on the top of the piston, you place the marked side to the front. As always, check with your supplier for verification.
 
From the blueprints I have seen the cylinders have the offset---something like 0.187, that piston markings have more to do with thrust--non thrust sides
 
Like MAc said (post #3) some piston have a little dot dimple on top. This goes towards front of engine.
 
there is no mark on the piston tops,There is a vertical slot cut in one side of the skirt between the two oil rings should it go up or down?
 
Ol' Ron said:
Put the piston on a pencil , If it stays level it doesn't have an offset.
Click to expand...

Another method is to use two wrist pins to connect three pistons. Use a flat surface, pistons on their side, and roll the pistons separetely to look for an offset.

Karl
 
As Ol'Ron says and it's simple.
 

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When it came to off set pistons, back in the 60 we would revers the offset in the Chrysler hemis, Olds and Pontiac engines. Probably the SBS too, but we usually used aftermarket hi conp pistons in them. (Cheaper) the Hemis liked the switch and put out more revs and torque. Stock engines use the offset to quite the engine. Reversing it adds torque.
 
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