I am looking to get some knew heads for my 91 z28 with a 350 before i get these heads i was just courious on a few things. What size combustion chamber do stock heads have, how much do they flow and do stock heads have angled or straight spark plug ports.

 

if you search you can get the exact numbers

here's what i know/remember

iron L98 heads have a 64 cc chamber. and flow something like 194-196ish on the intake at .500 lift, and 130ish or 140ish on the exhaust side at .500 lift. not very good but can get you low low 13's and possibly into the 12's

i'm pretty sure its a L98 angle plug. some aftermarket heads like AFR offer L98 angle plug option. but i think most angle plug will work. just gotta clear the headers and run good plug wires