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Blowby #5280991 11/30/19 10:03 AM
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Lubener Offline OP
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My old 87 f150 w/4.9L is starting to exhibit some blowby. The breather gets blown out of the valve cover (it fits in tightly) and I get a small amount of oil in the breather filter. The engine consumes very little oil, about a half quart every 2500 miles. PCV system is working but I would like to try a "high flow" PCV valve. Does anyone have a OEM or Fram number I can go from that might work?

Last edited by Lubener; 11/30/19 10:05 AM.

The "thinking" man's friend.
Re: Blowby [Re: Lubener] #5281028 11/30/19 10:54 AM
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spasm3 Offline
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You could use a fixed orifice pcv valve with no check valve. You can drill it in increments till you got what you want. Would have some pcv flow all the time.

You will need to check the fit. Fram FV410
https://www.amazon.com/FV410-Positive-Crankcase-Ventilation-Valve/dp/B0010DW658

Last edited by spasm3; 11/30/19 11:15 AM.

13 elantra 81k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
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Re: Blowby [Re: Lubener] #5281056 11/30/19 11:40 AM
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mattd Offline
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Is it causing seals to leak as well?


2007 Ford F-350 4x4 6.0 PSD

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Re: Blowby [Re: Lubener] #5281111 11/30/19 01:07 PM
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Talent_Keyhole Offline
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Originally Posted by Lubener
My old 87 f150 w/4.9L is starting to exhibit some blowby. The breather gets blown out of the valve cover (it fits in tightly) and I get a small amount of oil in the breather filter. The engine consumes very little oil, about a half quart every 2500 miles. PCV system is working but I would like to try a "high flow" PCV valve. Does anyone have a OEM or Fram number I can go from that might work?


Try a dual stage, adjustable PCV valve made by ME Wagner http://mewagner.com/

The last PCV valve you will need to buy.

A fixed orifice PCV valve will not work well at higher speeds and loads due to low intake vacuum. That is when you need crankcase ventilation the most when blow-by is greatest.

Re: Blowby [Re: Lubener] #5281172 11/30/19 01:55 PM
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Chris142 Offline
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If it's that bad run a road draft tube.


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