Iron Heads are Done (ported & large valves)
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Re: Iron Heads are Done (ported & large valves)
A good link on some real flow numbers.
https://www.thirdgen.org/forums/v6/3...heads-3-a.html
https://www.thirdgen.org/forums/v6/3...heads-3-a.html
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Re: Iron Heads are Done (ported & large valves)
A good link on some real flow numbers.
https://www.thirdgen.org/forums/v6/3...heads-3-a.html
https://www.thirdgen.org/forums/v6/3...heads-3-a.html
I do wonder if those "fully ported" iron heads had the vanes untouched, finned or removed and what size valves were used.
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Re: Iron Heads are Done (ported & large valves)
I also think a big part of why alum swaps are so beneficial is you get to get away from the crappy mpfi intake. I've read about some iron head setups who swapped to the edelbrock performer carb intake and put down decent numbers.
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Re: Iron Heads are Done (ported & large valves)
yes the intake helps greatly but the main gain is just the heads. Their d ported exhaust runners, larger cc runners, better combustion chamber. It's just a overall better design. Cfm flow is greater no matter what you do to the iron. Just Imagine how much the large port gen 3 will flow with some solid porting. GM head design in v6 and v8 changed dramatically in the late 90s. Wow did they get better. But I'll stop hijacking the ops thread. Sorry.
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Re: Iron Heads are Done (ported & large valves)
yes the intake helps greatly but the main gain is just the heads. Their d ported exhaust runners, larger cc runners, better combustion chamber. It's just a overall better design. Cfm flow is greater no matter what you do to the iron. Just Imagine how much the large port gen 3 will flow with some solid porting. GM head design in v6 and v8 changed dramatically in the late 90s. Wow did they get better. But I'll stop hijacking the ops thread. Sorry.
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Re: Iron Heads are Done (ported & large valves)
i'm also gonna try my hand at putting the "power lynz" into the ports to create a boundary layer for the air, increasing velocity and improving fuel atomization.
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Re: Iron Heads are Done (ported & large valves)
as of 830 tonight the fins are gone.big mistake ? we shall see. but the heads couldn't get much worse than they were.
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Re: Iron Heads are Done (ported & large valves)
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Re: Iron Heads are Done (ported & large valves)
they're not pretty and by no means professional but the boost should make up for it. I might go back in and work on em some more.
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Re: Iron Heads are Done (ported & large valves)
I ran a best of 14.97 in the 1/4 and had the vanes ground to a fin in my 3.1 with iron heads
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Re: Iron Heads are Done (ported & large valves)
Forgot to say it but that was na. No boost, no juice, all motor
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Re: Iron Heads are Done (ported & large valves)
I don't know if I still do or not. Il have to dig around some and see if I can find one
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Re: Iron Heads are Done (ported & large valves)
haven't found pics yet but here's a video of the ol' v6. That wasnt the 14.97 pass. That was 15.13
https://youtu.be/VuzQW45kv0s
https://youtu.be/VuzQW45kv0s
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Re: Iron Heads are Done (ported & large valves)
haven't found pics yet but here's a video of the ol' v6. That wasnt the 14.97 pass. That was 15.13
https://youtu.be/VuzQW45kv0s
https://youtu.be/VuzQW45kv0s
Man I haven't seen you on here in a bit! Good to see you are still around. That was one mean gen 1 660.
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Re: Iron Heads are Done (ported & large valves)
Thanks. I still get on here pretty often, just read most of the time now, don't post too often. Still have plans to build a turbo hybrid motor, just don't seem to have the time or money anymore
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Re: Iron Heads are Done (ported & large valves)
fasteddi, what did you do about the intake manifold heat riser ports in the middle exhaust ports on each head? Seems like this would be bad for turbo exhaust flow if half of 2 of the cylinders are losing exhaust flow to the intake???
Last edited by Sierra6; 01-15-2019 at 10:08 AM.
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Re: Iron Heads are Done (ported & large valves)
this is what i'm talking about for those who do not know. they were used to heat up the intake manifold and thus the carb back in the carb days but I don't see why our engines need them. Looks like GM designed these heads for a carb'd engine and left em in the casting for 9 years after switching to port fuel injection
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Re: Iron Heads are Done (ported & large valves)
If it was me I would melt down some cast aluminum, fill the holes and then blend the bowls...well that's what we do with the OEM Oldsmobile heads when porting them.
Unless there is another way to block the crossover you will probably be fine just leaving them open.
Unless there is another way to block the crossover you will probably be fine just leaving them open.
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Re: Iron Heads are Done (ported & large valves)
this is what i'm talking about for those who do not know. they were used to heat up the intake manifold and thus the carb back in the carb days but I don't see why our engines need them. Looks like GM designed these heads for a carb'd engine and left em in the casting for 9 years after switching to port fuel injection
I didnt have those on my heads. 1991 3.1l heads. Quite honestly ive never seen that before. And trust me I knew every mm of my iron and alum heads
you are right that would be a big pain if you have that there.
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Re: Iron Heads are Done (ported & large valves)
I already have the new valves in and everything. i'd hate to have to do that. maybe this won't kill performance too bad. I might try to block it off on the intake side by welding something in there to block it.
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Re: Iron Heads are Done (ported & large valves)
that port to the right of the left intake port is where the exhaust flows to the lower intake. I can see them in your heads, fasteddi. But I guess they might have been blocked off inside the exhaust port so you never noticed and like me thought it was a coolant port.
I know my '85 heads had these, but I never looked at the new heads I had ported close enough to see if these were in there on them . (The new heads are from a 1989 2.8L) In all the pics I was sent, this was never shown. Fingers crossed that they don't have it either. I don't have the heads at my house right now to confirm.
I know my '85 heads had these, but I never looked at the new heads I had ported close enough to see if these were in there on them . (The new heads are from a 1989 2.8L) In all the pics I was sent, this was never shown. Fingers crossed that they don't have it either. I don't have the heads at my house right now to confirm.
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Re: Iron Heads are Done (ported & large valves)
What does the crossover port look like on the intake manifold?
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Re: Iron Heads are Done (ported & large valves)
I found a pic of some falconer heads on here and if you look real hard you can see that his heads have the heat riser port in the middle exhaust port too.
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