i originally bought a 99 civic si head for an ls/vtec setup. the mechanic that put my ls/vtec together almost a year ago swapped heads on me without informing me. sad part is i found out just recently. i asked him why i have a head that says 9/1 on the stamp thing. that means its a 91 head right? is there a difference between a 91 b16 head and a b16a2 head? casting? air flow? i currently have buddy club spec3 cams and no name dual springs w/ titanium retainers installed in it. he said its just a number..but i dont know.. pls help. thanks

 

yes, the a2 head has slightly more aggresssive cams

 

well..iv replaced a few components of the head. im currently running buddy club spec3 cams & dual springs with titanium retainers. but as far as casting, is there a difference? pls help. i wanna know if i need to take legal action against him.