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RPMbs

airchairmen

New member
What should the RPM's idle

What should the RPM's idle at and top out at on a 350 chevy(edle brock intake)? Its a 18ft. Formula. I have a 21" pitch s.s. prop and a 19" pitch alum. prop.
Thanks.
Rick
 
"Idle 650 rpms in gear in the

"Idle 650 rpms in gear in the water with not additional throttle

Max rpm should be 4400 - 4800 rpm.

Use what ever prop gives you either a better hole shot or top speed, your choice."
 
"When I was a kid, we had a 18

"When I was a kid, we had a 18ft formula with a 350 mercruiser. We would get 5200 rpms out of it at 53mph."
 
It was propped wrong then.

It was propped wrong then.

An 18 ft formula with a 350 should have been running close if not more than 60+ mph easy.

a friend just purchased a 19 ft checkmate 3 days ago with a 350 1988 all original. wrong prop and a hydrfoil on outdrive. 54 mph 4100 rpm 2 adults ~450 lbs and 1/2 tank of gas. 23 pitch prop. came with the boat and we were shaking out othe issues so we did not do any prop changes.
 
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