[Jay S]

The Head flow post..Intakes…More engine TECH from this build

Stock Intake flow 6x-4, measured on our flow bench converted CFM @ 28”
.100”. 83
.200”. 138
.300”. 189
.400”. 213
.500”. 216

I don’t have the ported flows for the 6X-4’s when they were running 270s with the 2.11” 30* valves. But the 96 heads we run flow similar, these 96s had a little more work done to them than the 6x-4s before I changed them to 2.125” intakes. The 6x topped out at mid 270s @.6” for the work I did. The 96s have more iron removed off the short side radius, deep bowl. But for comparison, here is the flow numbers for the 96 heads on the 455 in our T-37. Stock 30* seats. Again, on our flow bench…No welding or epoxy, RA 4 port size

.100”. 90. Change from stock 6x is +. 7
.200”. 165. Change + 27
.300”. 228. Change +39
.400”. 248. Change +35
.500”. 272 Change +56
.600”. 282. Change + 66
.700”. 284. Change + 68

These are the Ported 6X-4 heads with 2.125”. Most people probably assume I switched to 2.125” valve with 45* seats for more flow, that was not the primary reason. It was to manage the extra compression this engine has, and spread the power band out more. I will compare the 96 head engine to these for the next post. And you can see the numbers, and different ways that we changed cams and compression to match the heads flows.

.100”. 74. -13 against stock 6x, -16 ported 96
.200”. 148. +10 -17.
.300”. 219. +24. -9.
.400”. 248. +35. 0
.500”. 282. +69. +10.
.600”. 292. +79 +10