| Some oven cleaners are caustic, and some caustics can attack aluminium, 
which may be an issue.  I've always understood that when removing carbon 
(which hasn't been necessary as part of a routine a decoke for many decades 
now) it is best to leave a ring of carbon round the outer edge of the 
piston.  As such that dictates an implement to remove the carbon from the 
rest of the crown, of such a form and used in such a manner so as not to 
'dig in' to the crown and leave rough patches.
PaulH.
----- Original Message ----- 
> My American Muscle Car buddy suggested using spray on oven cleaner to
> remove carbon build up on  the tops of my pistons when they are still in
> the block. 
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