C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Oct 27, 2011 | 05:01 PM
  #21  
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cardo0
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From: Las Vegas - Just stop perpetuating myths please.
Default U won't get much for performance with compression that low.

Originally Posted by Roco71
I did a compression check and all cylinders were around 140 expect one it was at 130. The heads I am putting on I got $100 and are much better shape than what is one the car now. Yes the blue smoke is there on restarts more than start ups. I do not want to dump a bunch of money into this engine. I did not plan on having it this long but other things outside of my hobby have taken place and are priority.


Cruisin, I will check into it,

1969 Ray, My friend said the same thing

Thanks
I know how spare time for the vette and other priorities go. Well if time is really a factor then maybe are better to have a shop just do the entire head R&R with a valve job until your ready for the new "crate". Just bolting on a set of $100 used heads may make the situation worse unless u really, really know where they came from. Once u add up costs like gaskets and supplies its more like $200 to R&R the heads. $200 that could go to a local shop that will have somewhat of a gaurentee. U would be surprized that shop prices come down near the holidays as no one is spending on car repairs and shops are begging for work just to pay the utilities.

Well good luck let us know if we can help,
cardo0
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Old Oct 27, 2011 | 05:58 PM
  #22  
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From: Oxford MA-----You just lost the game!!!!
Default

Originally Posted by Roco71
I did a compression check and all cylinders were around 140 expect one it was at 130. The heads I am putting on I got $100 and are much better shape than what is one the car now. Yes the blue smoke is there on restarts more than start ups. I do not want to dump a bunch of money into this engine. I did not plan on having it this long but other things outside of my hobby have taken place and are priority.


Cruisin, I will check into it,

1969 Ray, My friend said the same thing

Thanks
140 sounds a little bit low on the compression, but not worn out, more like starting to get there. That bottom end very likely still has plenty of miles in it. The most important thing is the spread; if the cylinders are all pretty close to the same compression, you should be in pretty good shape. If it runs well, and just burns a little oil on startup, and you are definitely going to go with a crate motor next year, I wouldn't sink a nickle into it. Just drive it.


Scott
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Old Oct 27, 2011 | 06:37 PM
  #23  
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Roco71
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From: Vero Beach FL
Default

The heads that I bought are in far better condition than the ones on the car currently. I bought them from a guy that took them off his car to replace them with aluimum heads. On the old heads three of the exhaust valves had a lot of carbon on them so much carbon it probably weighed more than the valve itshelf and upon removing the carbon you could see the wear on the valve stems. These are toast and not worth recondtioning

The cylinders walls looked ok someone has been there before. The pistons are flat top and there was not a ridge at the top of the cylinder.

I will get it together in the next month and we we see what happens. Thanks a lot for all the help.
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Old Oct 27, 2011 | 06:51 PM
  #24  
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If it smokes a little on start up could just be your valve seals not hard nor expensive to do.

Guarantee the gasket will fix your ills.
Still have issues after that then its time to chase other things but bet youll be just fine
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Old Oct 27, 2011 | 07:02 PM
  #25  
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From: Vero Beach FL
Default

Originally Posted by cuisinartvette
If it smokes a little on start up could just be your valve seals not hard nor expensive to do.

Guarantee the gasket will fix your ills.
Still have issues after that then its time to chase other things but bet youll be just fine
On the heads that I am putting on I am cleaning up the valves and lapping them and replacing the seals and using umbrella seals. Pretty sure (hopefull) that will clear up the smoke issue and get me on the road for a while.
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Old Nov 1, 2011 | 05:51 PM
  #26  
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cardo0
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From: Las Vegas - Just stop perpetuating myths please.
Default It reads like u have the engine apart already.

FYI using a 0.015" Felpro head gasket will help increase your compression, work great with iron heads and are as cheap as any gasket. U may already know this - but just incase u didn't.

Good luck and let us know how the replacement heads work,
cardo0
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