Why, just buy good pistons?
Did this a dozen years ago--chambers came in at 45 cc I believe. Beware your piston valve reliefs will have to change to accommodate. J.Rob
Just found it interesting. Kind of a fools endever these days.
I have been pondering this exact thing for a few days now, only for a big block. I may just spray weld the chambers then mill them to create a closed chamber 906 or what ever. Just changing pistons will not gain the desired quench you get from a closed chamber. I'm thinking my pistons are too far in the hole for good quench anyway, but I could gain a little in compression, which the cam may drain off anyway. And so goes the vicious cycle with it's myriad of variables. I shall persevere and overcome, or I will just build a 280hp 440 that will run forever. Skinny tires should get me the smoke I desire.
Custom pistons would probably be cheaper. 1967 915 heads are closed chamber as are 516's. The 516's in stock form will loose to the better flowing 906's. Search IQ-52's low compression 440 build. If you know the right combination, you can get a lot more than 280 HP, open chambers and all.
the 516 head has way smaller intake ports. even ported , they will not come close to a stock 906 head!!!!! 184 cc vs 203 cc. not worth the effort. seen them on flow bench!!!
yes! :cheers:
You will also have to mill the intake to match the heads, and then figure out pushrod length, and/or shim the rocker arms... One headache after another... :banghead:
I agree, just buy the proper set of pistons... :d
I have been pondering this exact thing for a few days now, only for a big block. I may just spray weld the chambers then mill them to create a closed chamber 906 or what ever. Just changing pistons will not gain the desired quench you get from a closed chamber. I'm thinking my pistons are too far in the hole for good quench anyway, but I could gain a little in compression, which the cam may drain off anyway. And so goes the vicious cycle with it's myriad of variables. I shall persevere and overcome, or I will just build a 280hp 440 that will run forever. Skinny tires should get me the smoke I desire.
I have been pondering this exact thing for a few days now, only for a big block. I may just spray weld the chambers then mill them to create a closed chamber 906 or what ever. Just changing pistons will not gain the desired quench you get from a closed chamber. I'm thinking my pistons are too far in the hole for good quench anyway, but I could gain a little in compression, which the cam may drain off anyway. And so goes the vicious cycle with it's myriad of variables. I shall persevere and overcome, or I will just build a 280hp 440 that will run forever. Skinny tires should get me the smoke I desire.
Could you explain this posses to me, in more detail...............
Google spray weld.