3406b turbo upgrade???

Thanks for the info. Are these engines typically not a real smooth engine at 1700 plus RPMs?

 

I have always felt that they are quite smooth up to 2100. In my experience the power starts to fall off above 1800.

I wonder if you are due for a new vibration dampener?

 

I agree with @Oxbow. My 7FB is smooth all the way through. Varys with governor springs when fuel starts cutting back. What is Max rpm no load in neutral?

 

I'd go with a viscous damper if it has old rubber one on it.

 

Both my B models are smooth. My 86 is a 7FB my 91 is a converted PEEC with a 7fb pump. Like @Oxbow said you can twist them up but they don't pull well till they fall to 1800 or so. I am gonna say damper or timing if it's got some shake in it

 

Good info. thanks. Any damper better than the other? it does have what appears a damper with rubber

SP, max rpm in neutral is about 2000rpm.

 

Should be around 2300 with a good known tach. Sounds like might be a 1800 RPM governor spring. We can look it up by s/n if you want.

 

Sure u need the serial#4mg38299
Tag says bare engine high idle 2326rpm, full load rpm 2100.
This a decent model b?

 

Should be absolutely.

 

Here are test results and performance data to give you idea on exhaust temps from pyro to manifold difference. It is run of the mill 425/1450 with 2332 RPM no load/2100 RPM load. Good ol workhorses that I would take over a new emissions crap any day of the week! Vibratech seems to be a good damper. Made in the USA. Put a viscous one on it.