Problem with the 347

[Mizark347]

I built a 347 for my 91 LX that ran great for a couple months and yesterday something went wrong. I got on it and it stuttered and power was no longer at about 5500 so i back off. And now it feels like its got a huge vibration at any RPM but Idles fine. What does a Blown head gasket feel like? could it be something internal?
Thanks, Mark

 

[1990gtstang]

check your plugs/wires maybe?

 

[Cammed90Notch]

PCV valve?
spark plugs
check the oil, (for any contamination), just some thoughts

 

[347 Special]

CHECK the balancer also since you have some vibration.

 

[KDK1988GT]

CHECK the balancer also since you have some vibration.

Yeh what kind of balancer are u running ?

 

[Js5ohLX]

sounds like you lost a cylinder.