stock Cr of a 1974 440?

[Kryp2nitE]

anyone know the stock Cr of a 1974 440?

the engine is 30 over and the guy i bought it from says he replaced it with stock Cr pistons

[694spdRT]

Should be around 8.2 to 1.

[cudaken]

 Not going into the crazy stuff like deck height, heads CC's and head gasket thickness with a 30 over bore you should be at 8.53 to one. That is with a steel .0020 head gasket.

                                           Cuda Ken

[John_Kunkel]

If you take the actual dimensions and do the math you'll find most '72 and later motors are .4 below advertised compression ratio; earlier motors are closer to .5 off.

[Chryco Psycho]

I agree , do the math ,I bet it is around 7.8:1

[cudaken]

 Like I siad with keeping it simple. Now we are talking about dech heigh and I 


                      Cuda Ken

[BigBlockSam]

how could you bring the compression up on a 74 motor?  what if you put in higher compression pistons? will you run into any  other problems?

[firefighter3931]

how could you bring the compression up on a 74 motor?   what if you put in higher compression pistons? will you run into any   other problems?

A set of speedpro 2355 six pack replacement pistons will bring the comp up to 9.3-9.5 and that makes for a nice street engine. 

Ron