View Full Version : exhaust restriction

01-05-2000, 12:06 AM
My 81 C10 has a 250 inline 6 in it. I had a new exhaust system installed and shortly after I started getting blow-by smoke coming out of my oil fill hole. I have replaced the pcv vave and hoses and all related exterior parts. Could there be something internal thats causing a restriction or am I looking at a cracked piston?

01-05-2000, 04:50 AM
Excessive blowby could be an indication of worn cylinder wall, worn/broken rings, or piston. Something in the cylinders are not sealing correctly.<p>----------<br>Chris Lucas<br>http://www.wwisp.com/~captkaos

01-05-2000, 04:55 PM
The early 80's inline 250 6 cyl had an integral head design, meaning that the intake was part of the casting of the head. This caused the head to be prone to cracking.<br>they usually cracked between the vavles causing blowby and loss of compresion.<br>Forget about repairing the head, I payed and payed to try and fix, and I would have been better off installing a sb chevy v 8 for alot less money.<br>And trying to find a good head is next to impossible, a head off an older model may work??<br>Dino<p>----------<br> Professional Ice and Snow Management <br>Products:Services:Equipment www.sima.org

01-06-2000, 02:58 AM
A guy I work with will sell me a 350 for $200. It needs to be rebuilt, but from what everyone has been telling me, it sounds like the best way to go. I just wish I could salvage all the new parts off my 250. Thanks for all the advice.

01-06-2000, 08:20 AM
Maybe you could call these guys first. The experts in inline 6 power.<br>http://www.cliffordperformance.com/main_clifford_home.htm<p>----------<br>Chris Lucas<br>http://www.wwisp.com/~captkaos