pulling heads

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DirtySwiffer

DirtySwiffer

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Brattleboro, VT.
im pulling the heads on my 360 for a couple reasons.
1)i dont have any information on the internals of the engine, and would like to know more.
2)looking to port match to intake and do some mild clean up, nothing crazy. (might as well while theyre off, seems a bunch of people are doing it these days)

its evident there has been performance work done to the engine. once the heads are off ill beable to measure bore and stroke, check my pistons out, see what ive got for head work done, if any... id like to be able to know the specs on my cam shaft, is there any way i can do that without going deeper?

im going to have my shop do a valve job, and measure the cc so i can accurately get myself a compression ratio. that way i will beable to get a head gasket to the corrrect thickness. id like to be around 9.5-10:1 or should i be shooting for something else? or should i get cam specs and then shoot for a certain compression?
 
You could do a compression test, and put a dial indicator on the valve to give you a decent idea of what you have.
Type of head iron or aluminum will also depend on the compression you can run.
 
Safe ratio = 9.0-1 iron, 10-1 aluminum.
More than a average size camshaft? 244 - 255, @ .050 Add .5 - .75
Big camshaft? 260+ duration @ .050? Add 1.0 +

Keep in mind the Dodge NACAR truck effort used cubic inch limited engine limited to 9.0-1. The made over 600 HP. Compression is often over rated and most mis used issue. It is best to have excellent air flow in and out of the engine than it is to have a high compression ratio. On a street car, to much ratio limits your cam selection while being limited to pump gas.
 
rumblefish360 said:
Safe ratio = 9.0-1 iron, 10-1 aluminum.
More than a average size camshaft? 244 - 255, @ .050 Add .5 - .75
Big camshaft? 260+ duration @ .050? Add 1.0 +

Keep in mind the Dodge NACAR truck effort used cubic inch limited engine limited to 9.0-1. The made over 600 HP. Compression is often over rated and most mis used issue. It is best to have excellent air flow in and out of the engine than it is to have a high compression ratio. On a street car, to much ratio limits your cam selection while being limited to pump gas.
Click to expand...

At 8500....???
 
im trying to get the duster into a storage unit for the winter right now. as soon as i do, i can work on it. by running a compression test, and measuring the valve travel what am i accomplishing? my assumption is cam duration with the valve travel. but what am i getting by knowing compression? not trying to be difficult, just want to knowledge, thanks for the replies guys. im running iron heads too
 
DirtySwiffer said:
im trying to get the duster into a storage unit for the winter right now. as soon as i do, i can work on it. by running a compression test, and measuring the valve travel what am i accomplishing? my assumption is cam duration with the valve travel. but what am i getting by knowing compression? not trying to be difficult, just want to knowledge, thanks for the replies guys. im running iron heads too
Click to expand...
The compression you're checking won't be your CR- the CR's a factor of it but not a singular one. It'll do a good job of showing the overall condition of the motor, its individual cylinders, and the valvetrain. You'll see most of it when you pull it apart, but checking'll give you an initial idea of how it is.
 
well i did not mention that the engine only has about 200 miles on it. i got the car with it bolted in to the engine mounts (no wiring hooked up at all). was told it was broke in at the shop it was rebuilt in out in idaho. so i would assume my compression numbers should be excellent, but thats easy enough for me to do so i will. i am awre those #s wont be my CR.
 
so your taking a professional built engine apart with 200 miles on to see whats inside for parts ?
 
im not saying it was prefessionally rebuilt, but it seems to have been done well. although they put a 727 flexplate in with the 904 transmission. i just dont like how i know nothing about the internals of the engine.

there really is no reason for me to pull the heads other than to gain knowledge of my project. if there are ways of me to get information without pulling them, then by all means ill do that instead. i just makes me nervous running it knowing nothing about the built engine.
 
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