Quick question here, does anyone know the combustion chamber volume of the c4ae 6090 G heads?

 

This here says they are 352 heads, 71-74 cc:

332-428 Ford FE Engine Forum: Head Casting Numbers Chart

 

You will find that they will be to the higher side at 74cc rather than the lower side.. most chambers i have CCed anyway..

 

Thanks for the info guys. Im not sure the accuracy of the chart since these are on my 1965 galaxie with a 390 and im 99% positive its all original, but if you have actually measured several of these RapidRuss, then that sounds good enough for me to count as fact. Thanks for the response guys.

 

If you haven't stood over it since it rolled off the line, you can't be sure it's original.

Ford may have used those heads, as that is not unheard of and casting numbers don't change every year.

Or, the original engine may have had a burned valve or two somewhere along the way and the heads were exchanged vs. rebuilt.

 

Very true, hence the 1% doubt I have always heard these are fairly decent flowing heads for factory castings, and since the factory 1965 owners manual (which i have) says it came out with 10.2:1 compression, 300 hp, 427 ft. lbs., and was designed to run on 101 octane leaded fuel, it wouldnt suprise me if they where factory. But you are right, the car is 46 years old and i have only had it the last year and a half, so there is no way to be positive thats what they rolled out with.

 

A '65 Galaxie with a 390 very likely rolled out with a set of C4-G heads. 1966 was a pivotal year for design changes.

 

Well i ran across a set of notes I must have kept from the last set of C4's I had run across the table..and the chambers ranged from 72.8cc's to 73.8cc's...So there was in that set about a 1cc variance.....But still run on the high side of the range as the the low side...