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Old 02-09-2009, 05:20 PM
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Exhaust guide seals

I tore my 400 down today since im going to put my new dart heads on and rebuild it all forged.

Took the 305 heads that were on it off and tore the springs off. I foundout that the intakes had new clamp style oil seals but the exhaust had old rubber umbrella style seals.

Could this be the reason why both tailpipes smoked like a SOB after it warmed up just off idle and increased with RPM's. Or is it still as I figured blown headgasket/cracked block (gonna get it magnafluxed soon)/cracked head/hit water porting/rings didnt seat? Were talking billowing call the fire department clouds of smoke.

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Old 02-09-2009, 05:25 PM
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The seals were not your problem. This combination of seals or less (O-rings) has been used for years on Chevys and do well.
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Old 02-09-2009, 05:25 PM
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Possible but not probable.

they would have to be VERY worn out to smoke that bad. Usually that means the intake giudes are letting oil collect on top the valve head. Look at the backs of the V-heads, You see a ton of built up black tar aspualt like hard stuff?
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Old 02-09-2009, 06:49 PM
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Quote:
Originally Posted by Nsomnia
I tore my 400 down today since im going to put my new dart heads on and rebuild it all forged.

Took the 305 heads that were on it off and tore the springs off. I foundout that the intakes had new clamp style oil seals but the exhaust had old rubber umbrella style seals.

Could this be the reason why both tailpipes smoked like a SOB after it warmed up just off idle and increased with RPM's. Or is it still as I figured blown headgasket/cracked block (gonna get it magnafluxed soon)/cracked head/hit water porting/rings didnt seat? Were talking billowing call the fire department clouds of smoke.
This is a good choice for seals. The clamp style are good for keeping the vacuum from sucking oil down the intake stem and the umbrella is adequate for keeping oil away from the exhaust.

Really foul smelling exhaust is probably pulling coolant into the chambers rather than oil. Oil smoke smells like,,,, well oil. Gas smells like gas, some brands, like Shell, have a more chemical smell to them from their additives, but in general they smell like gas. Coolant has a acrid smell, with a hint of sweet. It is really retching to the nose and burns the eyes big time, but it leaves a strange yucky yet strange sweetish back taste on the tongue.

Bogie
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