ßix pack comp

[mike1965]

What kind of comp am i looking at with a 440 six pack bottom end and 80cc heads.

A what comp did they have with 906 heads


Thanks Mike

 

[Cranky]

http://www.csgnetwork.com/compcalc.html

That's just one of many calculators that are on the net. Need to know a lot more about your engine to get you at least close....

 

[mike1965]

http://www.csgnetwork.com/compcalc.html

That's just one of many calculators that are on the net. Need to know a lot more about your engine to get you at least close....

Cranky what i would like to know is what did they come with stock and what head did they come with open 906 or closed chamber 915's

Mike

 

[Cranky]

The 440 6-pack was introduced in mid 69, right...? It would have had 906 heads, pistons in the hole .020 (2.062 CH) with steel shim gaskets and cut with valve reliefs....iirc.

 

[mike1965]

The 440 6-pack was introduced in mid 69, right...? It would have had 906 heads, pistons in the hole .020 (2.062 CH) with steel shim gaskets and cut with valve reliefs....iirc.

What comp did they have and do you know what the 906 heads combustin camber cc is

 

[Jim's Maxie]

The 440 6-pack was introduced in mid 69, right...? It would have had 906 heads, pistons in the hole .020 (2.062 CH) with steel shim gaskets and cut with valve reliefs....iirc.

69 1/2 were flat top,no valve relief until 70.Factory listed comp was 10.2 for 69 and 10.5 for 70.

 

[mike1965]

so I should be around 10.3 compression on a 70 440 six pack short block with 80cc 440 source stealth heads or am I way off.

 

[Meep-Meep]

What Cranky said.

Six pack engines use basically a zero deck piston assuming the engine is blueprinted. Compression will likely be 10.5:1. 906 head CC is 86.