420cc clone flatlined at 5750 rpm ?

[Joe-405]

What makes a clone flatline at 5750 every time.

I have cam and supporting valve springs. With a 32mm carb and header.

Is it the stock timing by chance ? It doesn't have the limiting coil.

 

[trinik7597]

It takes work and $$$ to get a big block to spin into the higher rpm range ... they are built for torque and don't rev high like a small block ... crank balanced... get rid of the slave balancer... lighter flywheel... head work .. forged piston... billet rod etc..

 

[Joe-405]

I got it figured out it was timing. It runs higher rpm now. And with a stock flywheel still. But I have a new billet one coming. And with a torque converter even. Timing key got me +500rpm and +10mph and I let off.

And thanks for the reply I really appreciate it. Didn't know if this was under the don't know can't tell speed secrets section or not. Lol.

The balance shaft is already gone. And I have a billet long rod already. And next is fully worked cylinder head.

 

[BBQJOE]

Hey Joe! I think I recognize you from somewhere!

 

[125ccCrazy]

did you have the crank balanced when you pulled the balance shaft? if not how are the vibrations?

 

[Joe-405]

Didn't have it balanced. And it vibrates a little prior to shifting to high gear with the tc but that's it

 

[Joe-405]

Hey Joe! I think I recognize you from somewhere!

Wonder why. Lol