Refurbish time

[commando1]

Ive seen that stuff since the sixties. Pre-ethanol and when lead was still used.
Next time you throw some wings on the charcoal grill, see the white on the edges of the briquettes as it reaches peak temperature. Ash. Pure carbon and the residue of any other minerals in the oil and gasoline.
Raise the piston to the deck and go at it with a fine wire wheel brush on your hand drill while soaking it with carb cleaner. Finally with a new razor blade for each piston.

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[68plymouth383]

That's the very best way to clean it.

Ive seen that stuff since the sixties. Pre-ethanol and when lead was still used.
Next time you throw some wings on the charcoal grill, see the white on the edges of the briquettes as it reaches peak temperature. Ash. Pure carbon and the residue of any other minerals in the oil and gasoline.
Raise the piston to the deck and go at it with a fine wire wheel brush on your hand drill while soaking it with carb cleaner. Finally with a new razor blade for each piston.

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[detmatt]

Leaving it there will boost your compression though...

 

[commando1]

Most likely cause detonation....

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[detmatt]

Not that much higher compression!

 

[68plymouth383]

Exactly. The white stuff he is seeing is from hot spots.

Most likely cause detonation....

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[commando1]

Detonation not from the higher compression but due to the hot spots it creates in the chamber causing premature ejac.... Umm. er... ignition of the gasses. That's it. Ignition was the word I was looking for.

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[Big_John]

I found this on a Kohler engine failure analysis guide.

Hard, crusty, mottled white deposits resultfrom high combustion chamber temperatures. They
could be from lean carburetion, an intake air leak,
over-advanced timing, or poor quality gasoline.

https://www.gardnerinc.com/dealers/kohler/kohler_study_guide/10 - Failure Analysis Guidebook.pdf

 

[70NPORT]

I noticed shortly after pulling both heads they both had valves that were minutely recessed in their seats. Shitty modern gas. No. 4 cylinder is really recessed in its seat....a good ways fallen below the cylinder head deck. I guess that's where my compression was going on the cylinder.

 

[Ripinator]

I've heard theories on what the white crap is, but never found a good answer. I have seen it many years before they started putting ethanol in gas, so it's not related to that.

I don't think its just the ethanol either. . . But they have also done something else with gasoline (I'm not sure what) that has contributed to the shittyness too.

 

[Ripinator]

I noticed shortly after pulling both heads they both had valves that were minutely recessed in their seats. Shitty modern gas. No. 4 cylinder is really recessed in its seat....a good ways fallen below the cylinder head deck. I guess that's where my compression was going on the cylinder.

Wow ! That recessed valve is down so deep, it almost looks like it is the wrong size valve.

 

[commando1]

Looking at these heads and thinking that's what you were driving with, when you get things bolted back up, your car is going to feel like you added a turbo.
Wise decision.

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[70NPORT]

Looking at these heads and thinking that's what you were driving with, when you get things bolted back up, your car is going to feel like you added a turbo.
Wise decision.

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Yeah, tell me about it. I couldn't believe my eyes either.

 

[F Preston]

I had a pair of '68 318 heads from my Fury that were that bad. Strangely, the engine still ran well when I pulled them. Went to heads from a '74 Satellite. Same part number, but hardened seats from '73 on.

 

[70NPORT]

Yup. Ethanol gas was developed to destroy/remove older cars from the road. Its a government/environmental wacko conspiracy. No doubt.

 

[Mr C]

Were you able to save your original heads? (I doubt it due to the damage) Or did you have to source another set.

 

[70bigblockdodge]

I doubt you're going to be able to save that head, most likely cracked in area above the valve shared by Siamese exhaust ports the 452, are supposed to have more material in that area to cope with the hot spot from the lean burn engines. I would use fel pro gaskets and depending on how far down the piston is in the cylinder just make the switch to 452 and run 87 octane gas spend the .30 cents a gallon savings on beer and enjoy.

 

[70NPORT]

Were you able to save your original heads? (I doubt it due to the damage) Or did you have to source another set.

I doubt you're going to be able to save that head, most likely cracked in area above the valve shared by Siamese exhaust ports the 452, are supposed to have more material in that area to cope with the hot spot from the lean burn engines. I would use fel pro gaskets and depending on how far down the piston is in the cylinder just make the switch to 452 and run 87 octane gas spend the .30 cents a gallon savings on beer and enjoy.

Won't know until Monday. It will suck if they are trash. The other day I came across this guy:
http://themopardude.com/311100.html

If I find out they are trash (I'm not so sure but I guess we'll see) I might give him a call. Go for the heads with hardened seats already in them.

 

[70bigblockdodge]

What engine code is in your vin, if it is a N you will probably no problem bolting stock 452s on, don't worry about the .6-.7 tenths compression drop, see beer comment above.

 

[commando1]

Gary. I will give you good set of 452 heads. We'll just ship it to a rebuilder from here.

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