I Might Just Know What I'm Talking About
Join Date: Sep 1999
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Re: oil blow by into air filter
One of the problems is that the 258 is so reliable and built so well, that it continues to run well into the time that it shouldn't. [img]/wwwthreads_images/icons/smile.gif[/img]. I got about 194,000 out of my first one. I had blow-by so bad that I rigged up a system to catch all the oil, and still vent the valve cover. I went to NAPA, and bought a 90 degree elbow that fit in the rear valve cover grommet, and some heater hose. I ran the heater hose over to behind the windsheild washer bottle (always going downhill), and went to a "T", installed sideways. The downspout of the "T" I put into a quart plastic oil jug, with hose clamps, to catch the oil, and the top of the "T" I put to a breather. It really was amazing how much oil would come out of that motor. [img]/wwwthreads_images/icons/crazy.gif[/img] Being on the highway at high rpms was the worst. I have since put in a rebuilt 258. [img]/wwwthreads_images/icons/smile.gif[/img]
Also, in your PCV line, between the valve and the intake/carb, there are some restrictors - small plastic things with small holes, I guess to reduce the flow of air getting to the pcv. These will clog also, and you'll get no suction to the pcv valve, so watch those.
88YJ,4"susp,33"BFGMT,9kwinch,homemade swingout,258,999,4.10,weber32/36,GMHEI,one moonguy[img]/wwwthreads_images/icons/smile.gif[/img]