Help Me Out 360 Head Question!!

[scottylack]

I need to figure out my compression I'm getting in my engine... but cant find any volume numbers on my heads...

I'm running a stock 1978 4027596 head....stock head gasket...! VOLUME???


HELP!!​

 

[stevedemon340]

Is the short block stock? If not, What piston? Cast/forged? Need more info to try to help.

 

[scottylack]

I have all that ...I need the cc's volume of these heads????

 

[Cudafever]

I have all that ...I need the cc's volume of these heads????

My heads that cam off of a 78 Cordoba were 78cc i thing most non mag 360 came in between 73 and 78cc.

 

[scottylack]

wow...thats big!!!

 

[fishy68]

wow...thats big!!!

Yes it is. They are rated at 68 cc's but I don't know how they ever cam to that conclusion as I have never seen one less than 70 cc's stock. Most stock ones are in the 70-76 cc range from what I've seen. Alot of it depends on how many valve jobs have been done on them. If they've had the valves ground 2 or 3 times the valves will be sunk so far the combustion chamber cc's will be way up there. Just installing different valves can make a big diff. on it too. I went from stock valves to stainless REV valves and dropped from 70.8 cc's to 64.9 cc's on my X heads.

 

[Dakota_Don]

my heads were 72ccs

 

[scottylack]

whats the best way to figure out cc's? plexi and a syringe?

 

[scottylack]

and if it is... is there a site to show how to do it?

 

[fishy68]

Yeah that'll work.

Here's a link to a real cheap kit on E-bay. Comes with everything you need and instructions .

http://cgi.ebay.com/ebaymotors/ws/e...0395360749&viewitem=&sspagename=STRK:MEWAX:IT

 

[scottylack]

cool...looks like you can get all this stuff for nothing ....!

 

[1wild&crazyguy]

my j's were 69cc on 3cyl & 64cc on one.
the other head was 66cc-65.7 across.

you need to measure the chamber volume to really know.

you could do some calculator stuff with matching your actual dynamic/cranking psi, to what a compression calculator says you should have.

so measure the cranking psi, then input the cams intake closing degree and change the assumed static till you get close/on what dynamic matches yours.

all you gotta do is start with an assumed static then punch in yer intake closing event # and the rest is piston height, gasket thickness etc....

KB has a calculator that can help.

 

[2 Darts]

I need to figure out my compression I'm getting in my engine... but cant find any volume numbers on my heads...​

I'm running a stock 1978 4027596 head....stock head gasket...! VOLUME???​

HELP!!​

The cylinder head comparison chart in the How to Rebuild Your Small-Block Mopar lists your casting number at 66 cc and the piston sits .067 below the deck surface.