Right way to do it Buddy would be to deck the block down to 8.800 and save some weighr and use a 1.062 compression height piston.Better still get rid of the 6.125 rods and use a 5.850 rod but still cut the deck to lose weight.
My bad. I thought the OP had the block, crank, rods, and just wanted to know what pistons he could use. If you cut that much off the deck you will need the intake machined, and different pushrods, etc etc.
If its a 9.025 block you can save 25-30 pounds just by decking down to 8.800 even more if you get the grinder out and do a lot of deburring on the block
Thanks terry i didnt have a clue about doing any of that cutting the deck down, so i see that i can get a really light piston in there. why do you say even better is the 5.580 rod here.
Buddy,
Its all about rod/stroke ratio.With a 5.850 rod and a 3.25 stroke you will be able to run a bigger cam and make more total hp.Most of my 3.270-3.280 stroke motors I use a 6 inch rod but a 5.850 rod will run better.The 5.850 rods are harder to find but run better.
Don't think you can lose 25 0r 30 pounds by cutting .225 off a sbc block head surface. That surface is roughly 19.250" by 5.688" . Cast iron weighs .2609 lbs. per cu.in. 19.250 X 5.688 X .225=24.6 cu.in. X .2609 =6.42 lbs. And there are four 4.125 holes X .225 that will remove three more lbs from this number=3.42 lbs And don't forget about the water jacket and head bolt holes. So about 3 lbs per side, maybe 6 lbs total off the block. And how thick will your intake gasket need to be if you do this? Just get the right piston and rod combo and save yourself a lot of time and money.
stillhead is right. a bowtie standard deck block weight 183lbs and a short deck bowtie block with a 8.200 deck height weighs 167lbs. only a 16lb difference and thats .825 shorter deck height. no way you are gonna lose 30lbs by only removing .225.
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