Here are the stock and ported flow numbers of a 7MGE/GTE cylinder head.
Stock:
Intake
lift-flow
.100-77.4 cfm
.150-113.9 cfm
.200-141.4 cfm
.250-162.8 cfm
.300-176 cfm
.350-179.6 cfm
.400-179.6 cfm
.450-180 cfm
Exhaust
lift-flow
.100-60.4 cfm
.150-93 cfm
.200-112.9 cfm
.250-123.2 cfm
.300-127.8 cfm
.350-130.7 cfm
.400-133.2 cfm
.450-133.2 cfm
Fully Ported (valve stems removed to port + bowl work)
Intake
lift-flow
.100-80.4 cfm
.150-122.4 cfm
.200-159.9 cfm
.250-187.8 cfm
.300-202.4 cfm
.350-211.2 cfm
Exhaust
lift-flow
.100-70 cfm
.150-103.4 cfm
.200-121.0 cfm
.250-131.0 cfm
.300-139.4 cfm
.350-144.7 cfm
We stopped @.350 because most regrind cams don't go past this lifted.
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.
Stock:
Intake
lift-flow
.100-77.4 cfm
.150-113.9 cfm
.200-141.4 cfm
.250-162.8 cfm
.300-176 cfm
.350-179.6 cfm
.400-179.6 cfm
.450-180 cfm
Exhaust
lift-flow
.100-60.4 cfm
.150-93 cfm
.200-112.9 cfm
.250-123.2 cfm
.300-127.8 cfm
.350-130.7 cfm
.400-133.2 cfm
.450-133.2 cfm
Fully Ported (valve stems removed to port + bowl work)
Intake
lift-flow
.100-80.4 cfm
.150-122.4 cfm
.200-159.9 cfm
.250-187.8 cfm
.300-202.4 cfm
.350-211.2 cfm
Exhaust
lift-flow
.100-70 cfm
.150-103.4 cfm
.200-121.0 cfm
.250-131.0 cfm
.300-139.4 cfm
.350-144.7 cfm
We stopped @.350 because most regrind cams don't go past this lifted.
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.