well....you want to cut the piston to raise compression.....understand?...if you have a dish piston-this causes a lower compression ratio, sooo if you make that dish smaller-by cutting top off piston, you can raise compression-BUT piston will be lower in cylinder at this point...so what you do is deck block-by doing this piston is NOT below zero deck height but hopefully up too zero deck height(you must do your math/analyzing what you cut off piston and deck )....at this point you have a setup that has higher compression....this is a standard way to raise compression....this is ALOT cheaper than a set off $100.00+ a piece pistons($600.00 a set AT least for forged flat tops)....this is a standard engine procedure to raise compression...
does this make sense to you?
this is GREAT for hot street or light racing BUT not full out racing...This is why i recommend the full dish piston for 292 applications-this can and has been done to most ALL engines and pistons...above is basic concept- to verify this, find a true performance engine builder near you-and ask about this concept- of course he will recommend just buying a different set of pistons until you tell him you are refering to Chevy inline 6 engines- then again either $100.00+ a piece for pistons($600.00 a set) or this method to Increase CR-...by milling head you can also gain compression...ever see the so called "new" design in V-8 pistons? called a reverse dome...do they look like a dish piston? do they look like a 292 full dish piston?...take a look and then this hopefully will make more sense...
hopefully this will help .....
by using a cam of.560 lift or less AND dish pistons, valve clearance is not a problem....to verify, check clearance
