Just some thoughts. Head porting is expensive, Ram Engines charges $250.00 for a mild EA port job. About $650.00 for a full port and flow bench test. The more heads I do the more I learn and any head under discussion starts with what gen it is and of course SPFI or MPFI.
The unfinished sharp edge around the valves is horrific. I've measured this chunk of sharp aluminum to as much as .047 in depth. The sharp edge can form a hot spot and cause problems with detonation, as well as being sharp enough to induce cracks. This needs a roundover at least on all that have it. I've never had my hands on a gen 3 head so I don't know how that looks.
The MPFI heads shown here benefit from removal of material in the intake ports. The exhaust ports, bowls aren't too bad. NA engines are under 21" vacuume or so, exhaust is under pressure, so main attention payed to the intake. The head bolt casting and HLA bump removal are gains to be had in #1 and #4, as well as raising the roof and dropping the floor of the port. The #2 and #3 intake ports are much less a chalange.
A SPFI and MPFI NA EA 82 only has 4 to 7 hp difference between them, and that's with the MPFI NA XT having a bigger cam.
The SPFI head has really good intake ports, and the valve has that back cut, 2 angle valve, but has a badly formed bowl under the exhaust valve.At least gen 1 and 2, due to the EGR boss at each corner of the head extending into the exhaust port.
That boss is actually the ugliest part of those exhaust ports. Keep in mind the #1 and #4 ports are slightly shorter than the #2 and #3 ports.
These EA engines are going to be around for some time to come, one because of their light weight, reduce, reuse, and recycle comes into play and I can't see throwing away perfectly good parts and aparantly other folks don't subscribe to that either.
Ram Engines now sells a 130hp EA 82 with SPFI heads with their new stand alone fuel injection system.
I logged about 4 hours porting today. There's a reason head porting is pricey, and it's not for everyone. There is indeed power to be had with EA 82 heads if you pay the price.
And the New York Times said, "God is Dead". GD For you gearheads with inquiring minds when it comes to normally asperated tech, look this article over. http://www.enginebui...technology.aspx
Engine builder mag from a year or so ago. Goes into some interesting detail describing 500ci NA engines now knocking on the door of 3 hp per CI. And they rarely fail.
Edited by Quidam, 28 October 2012 - 05:12 PM.