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any new iron head or alum can be had with 118+ chamber .the 049 casting are 118 + head stock. you can not cut that much off the dome to get it to fit a smaller head it sounds . as for 10.6 cr. with...

how hard do they hit the head one spot or all over the dome ? this happen with the old close chamber ret port heads hi cr psitons and using them in the smaller chamber close chamber O port heads on...

well there Forged Head Relief piston FHR. yes there true forged pistons there strong