X head numbers ???

[wigsplitter74]

I was wondering if someone could fill me in on some numbers on stock X heads. I need to know what size combustion chamber they have and would like to know some flow numbers on stock cast X heads, thanks much.

 

[Handy Andy]

They are usually around 65cc on the 68-69 castings,and flow about 180-190stock,but to be sure spend a few extra bucks and get them cc d They can also get as high as 72cc ,the very.

 

[moper]

The chambers are typically much larger than the factory spec. That's true of all the mopar open chamber heads. The Xs tend to start around 72ccs. Especially if you re-use the valves. Also, the few stock X heads Ive seen flowed were higher.. closer to 205-210. Benches and testers are never the same so it's common to have different numbers.

 

[fishy68]

I have a set of 68 X heads and after a .010" cut the chambers cc'd at 71 cc's.

JFYI Valve type seems to make a big difference cause I later switched to Stainless valves and then cc'd the chambers again and it dropped to 67 cc's.

Here was my heads flow numbers when stock.

intake------------Exhaust
.100-60------------50
.200-120-----------95
.300-167-----------131
.400-200-----------143
.500-205-----------146
.600-200-----------148

 

[MB43]

I have a set of 68 X heads and after a .010" cut the chambers cc'd at 71 cc's.

JFYI Valve type seems to make a big difference cause I later switched to Stainless valves and then cc'd the chambers again and it dropped to 67 cc's.

Here was my heads flow numbers when stock.

intake------------Exhaust
.100-60------------50
.200-120-----------95
.300-167-----------131
.400-200-----------143
.500-205-----------146
.600-200-----------148

For comparison, here's the flow numbers from my X heads that were shaved, and then ported by Bobby @ BJR:

Lift - Intake - Exhaust
0.100 - 84 - 74
0.200 - 138 - 114
0.300 - 202 - 144
0.400 - 235 - 192
0.500 - 243 - 202
0.600 - 242 - 202

This is with 2.02/1.60 valves, 53cc chambers.

 

[D-mailman]

Fishy, the stainless valves will also improve the flow numbers too, over the OEM 'tulip' valves. Just about 6-8 numbers. on my bench.

Terry

 

[1967DartGT]

Check out this too

http://users.erols.com/srweiss/tablehdc.htm