No answers to the other thread, so I will put it another way. My carbed 3100 loves to spin up, I have had it easily over 6,000 for sure and it get better the higher it spins. Question is, does the Fiero tach read when it goes over 6,500 RPM? If it does I can mark it up for 7,000 and 7,500 RPM, but if it limits out for some reason I will have to find another tach. Larry

quote Originally posted by trotterlg: No answers to the other thread, so I will put it another way. My carbed 3100 loves to spin up, I have had it easily over 6,000 for sure and it get better the higher it spins. Question is, does the Fiero tach read when it goes over 6,500 RPM? If it does I can mark it up for 7,000 and 7,500 RPM, but if it limits out for some reason I will have to find another tach. Larry

It does not limit out at 6500.

Sometimes I shift at the "R" on RPM with my 3.4 DOHC.

What cam is in your 3100?

The V6 tach will at least go about 1" past the 6500 RPM mark, possibly further, but I don't know how accurate it is in that range. I calibrated my tach to match the scanner at 4000 rpm, and I can see some error in the lower rpm/idle range from day to day. So I assume the same happens on the other end of the scale as well.

My LS4 has a hp peak around 6800 rpm, so it tends to spend a bit of time off the tach scale... I need to look into a more accurate 0-7500 rpm tach...

Thanks, exactly what I needed to know. The cam is a custom grind from Delta Camshaft, I just told them I wanted it to be a free spinner and they ground it up for me. Down side is that it idles at about 1,200 and starts running good about 3,500, but it does like the RPM's. Larry

quote Originally posted by Steven Snyder: Sometimes I shift at the "R" on RPM with my 3.4 DOHC.

Same here.