7M Cylinder Head Flow Numbers

Here are the stock and ported flow numbers of a 7MGE/GTE cylinder head.

Stock:

Intake lift	Intake flow	Exhaust lift	Exhaust Flow
.100	77.4 cfm	.100	60.4 cfm
.150	113.9 cfm	.150	93 cfm
.200	141.4 cfm	.200	112.9 cfm
.250	162.8 cfm	.250	123.2 cfm
.300	176 cfm	.300	127.8 cfm
.350	179.6 cfm	.350	130.7 cfm

Fully Ported (valve stems removed to port + bowl work)

Intake lift	Intake flow	Exhaust lift	Exhaust Flow
.100	80.4 cfm	.100	70 cfm
.150	122.4 cfm	.150	103.4 cfm
.200	159.9 cfm	.200	121.0 cfm
.250	187.8 cfm	.250	131.0 cfm
.300	202.4 cfm	.300	139.4 cfm
.350	211.2 cfm	.350	144.7 cfm

We stopped @.350 because most regrind cams don't go past this lift.

Stock lift is 7.6mm (.300) for a N/A cam, we measured the cams to get our numbers, the duration is 199 @ .050.

There are two designs (port designs) of the 7M head. One has been dubbed "Big Port". Not sure of the production years. I have one of these heads from a JDM N/A, the casting number is 12. I had it flow tested to see if there was any differences. To my surprise the numbers where only different by 1-2 cfm up to .350 lift. Past .350 lift that head flows 10 cfm more in stock form than the regular port head in stock form. If there where a cam that had more than .350 lift maybe this head would be something to look at. Hope this information helps answer any questions about the "Big Port" head.

Here is a little more complete list of flowbench numbers from various people over the years (it looks like you quoted Defiant7m). All of these tests were done at 28" but there is still considerable variation in the numbers (though the trends are pretty consistent).


Intake:

7m intake	Defiant7m	Defiant7m	Defiant7m	INvis7M ('89)	Chevyeater1 ('90 #6 casting)
lift (in)	Stock	Ported (stock valve – cut guide)	Race Port 2JZ valves	Stock	Stock
0	0	0	0	0	0
0.05				37.8
0.1	77.4	80.4	80.8	81
0.15	113.9	122.4	121.7	118.5
0.2	141.4	159.9	152.6	149	158
0.25	162.8	187.8	181	166.8	183
0.3	176	202.4	201.3	184.8	198
0.35	179.6	211.2	211.8	190.7	205
0.4	179.6	216.5	222.4	193.7	210
0.45	180	220	231.8		210
0.5	180	220	239.1

Exhaust:

7m exhaust	Defiant7m	Defiant7m	Defiant7m	iNvis7M	Chevyeater1 ('90 #6 casting)
lift (in)	Stock	Ported (stock valve – cut guide)	Race Port 2JZ valves	Stock	Stock
0	0	0	0	0	0
0.05				30.2
0.1	60.4	70	70	65
0.15	93	103.4	108	84.5
0.2	112.9	121	135.2	106	135
0.25	123.2	131	150.3	116.9	148
0.3	127.8	139.4	163.8	121.4	155
0.35	130.7	143.1	167.6	126	156
0.4	133.2	149.5	171.8	129	158
0.45	133.2	155	174		160
0.5	133	155	188		162