Well I don't know if this is tech or not these days, but I finally got the GT-40 irons back from the machinist. I bought them back in August for $200 off an Explorer along with the intake. I spend $40 on a porting kit and did the porting myself. The machine work bill was $350. So fully worked GT-40's for less than $600. It took forever becuase of some internal issues on their part, but it was worth it.
Their work included: magnaflux, bake, check valve guides, all new flat bottom valves (1.94"/1.63"), 3-angle valve job, mill heads, spring lift and seat pressure check, full assembly (shimmed up the springs), new stem seals, EM-varnish, painted exposed surface, and last but not least a flow bench test.
I don't have many good pics of the port job, but I have the numbers that will be used to pick (or design) the cam. I compared the data of my ported GT40's to what we have posted in the FAQ sticky. I noticed they they are somewhat comparable to the Edelbrocks they have there. My exhuast falls off at around .300" but it's still a lot better than the stock port and waaaaay better than stock E7TE anyway, here is what my port job did for me.
Notice the exhuast flow at .300". I think that number might be messed up, I'm thinking it should be right on top of the Edie. That would even out that curve. But the low lift flow will help a lot. It's all gonna come down to the cam with this one.
View attachment 494844
View attachment 494846
View attachment 494847
Anywa, just thought I would share. I'll follow up with the cam once we're done with that this week.
Their work included: magnaflux, bake, check valve guides, all new flat bottom valves (1.94"/1.63"), 3-angle valve job, mill heads, spring lift and seat pressure check, full assembly (shimmed up the springs), new stem seals, EM-varnish, painted exposed surface, and last but not least a flow bench test.
I don't have many good pics of the port job, but I have the numbers that will be used to pick (or design) the cam. I compared the data of my ported GT40's to what we have posted in the FAQ sticky. I noticed they they are somewhat comparable to the Edelbrocks they have there. My exhuast falls off at around .300" but it's still a lot better than the stock port and waaaaay better than stock E7TE anyway, here is what my port job did for me.
Notice the exhuast flow at .300". I think that number might be messed up, I'm thinking it should be right on top of the Edie. That would even out that curve. But the low lift flow will help a lot. It's all gonna come down to the cam with this one.
View attachment 494844
View attachment 494846
View attachment 494847
Anywa, just thought I would share. I'll follow up with the cam once we're done with that this week.