I have an original 79 z28 350 v8 in my car. it has been bored 30 over, 11 to 1 TRW pistons, original heads cut for 375 valves, 30/30 solid lift cam, a 830 holley carb, a 350 turbo tranny with 2500 stall and a 3:73 LSD rear end.

Can anyone guesstimate what my horsepower range is?

Also, does my displacement change with it being bored? if so, whats the result?

Thanks a lot.

 

Hard to tell, it depends on how well the engine is tuned. Take a few runs at a drag strip, and the top speed is a pretty accurate measure of how much power it has.

 

355.5 CI Pete is correct not enough data to tell, heads are a big deciding factor smog heads usally dont flow all that well (except the 993 casting from what ive seen) and what do you mean by cut for the 375 valves?