[Old Guy with 87 GT]

srv ....i finally got time to reply ......

i didn't port my heads out real wildly ......i'm using the stock cam so all i really wanted to do was improve the balance between the intake and exuast ........

on the ex side .....i ground off the thermactor bumps and smothed out the little ridge on the bottom of the port ,right above the valve (..if you stick your finger in the port you'll feel what i'm talking about) then i polished up the rest of the port

on the int side .......all i really did was a mild polish .....smoothed out casting bumps

as for springs i used a crane kit ...part # 44308-1......it was complete kit with retainers and keepers designed to work on stock heads .....no machining needed ......

all in all ,i'm far from an expert ......i think if i woulda done a little more porting and put a cam in it i would get alot more out of it .......the mild stuff i did ,did knock like 4-5 tenths of my times thuogh (1.7s ,crane springs ,milling 020 ,fresh valve job (standard grind)and porting)