140 MPH on I=5 near Everett, Washington. Certified by the State Trooper that clocked me and gave me one hell of a ticket.

My 70' has a Stage two cam, 6 into 1 header, 2.5" exhaust, lowered, 16" wheel, 205x50 r16's, front spoiler, 4speed out of a 72 240Z. and thats all

i have a 75 280 but with just headers and exhaust and a zx 5 speed i got it up to 151 on I-5 heading back to college at 2am a few weeks ago... the radar machines the chp have out on the roads here in stockton verified my speed took me probably 5 minutes to get it up there from 85 mph all ion 5th gear. i was pushing 5700 in fifth. no power left, which was weird the car just wouldnt go any faster. this led me to put in the stage 3 cam last weekend, but i botched that job and now my car wont run oh well. it was fun while it lasted

140 mph (225kph) is an insane speed in a 30+ year old car. Hope your brakes are up to the task if you need them.

My 70' 240Z is 99% rust free, my whole suspension has been rebuilt (urathane) and I have brand new toyota 4-piston calipers and Green Stuff pads in the front, 280zx rotors and 240sx calipers in the rear and Earls S.S. braided brake lines in all 4 corners. YUP, I can stop if I really want to. Besides, the doctor said it is'nt too habit forming.

Dave.

Doctor was wrong

with my setup...3rd gear, 6500 rpm's tapped 100 mph...I was to scared to push it into 4th....

bored/polished/cam/fuel injected L28, with the 4 speed.

I'd like to know how accurate 30 year old speedos are at such high speeds.

my speedometers is accurate to about plus or minus 3 mph according to those radar guns the cops have

I've had my zed to 170kmh once....gotta say that was rather scary! But fun none the less. After I did it I decided I wont be doing it again in any hurry and haven't since. I've seen about 240kmh in my mates R32 skyline before....but 170 in the zed was still the more scary!