M670 more rpm’s

[mmkid]

Hello I want to get more rpm’s out of my m670 I have the spring zip tied shut and it isn’t enough any help thanks

 

[molinegb]

M670 runs around 1400 max if diesel.

 

[mmkid]

M670 runs around 1400 max if diesel.

Gas

 

[VicS]

Hello I want to get more rpm’s out of my m670 I have the spring zip tied shut and it isn’t enough any help thanks

You can't get any more rpm if the butterfly is wide open. Which it will be if the gov spring is zip tied. They don't gain much hp above 1800 2000. But I have seen a few with a 7" stroke turn 3500. But need a new cam, heads valves , springs. And everything balanced. Your cheapest bang for your buck is a 6" inch crank and blocks from a GB. If you can't use tall blocks just cut your rods off a half a inch and get a good welder to weld them back together. Or buy billet ones.

 

[MMDEL]

Do you have the High screw backed out?????