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This is exactly what needs to be done. Atta baby. I was just shy of doing the 2 barrel Holley EFI with the stock intake manifold but submitted to conventional thinking by using the 390 because I didn't have the ability to test the differences between the Offy and stock manifold. This could be a game changer with these engines. Can't wait to hear about your results.After a lot of discussion with people here and some research I’ve about become convinced that the Offey intake may not be all it’s cracked up to be...it’s popular because it’s the only 4 bbl option available. The primary reason to use it is to be able to take advantage of the Holley 390 carb but with EFI it’s a different story. We’re going to be doing a comparative flow bench test of the Offey vs a ported and modified stock 2 bbl intake...my engine guys are betting that the stock intake will win.
The little bit I know about this stuff makes me dangerous but the limiting factor in the equation is the engine itself...from what I understand, at 100% volumetric efficiency it can only handle about 270 cfm at 5500 rpm...if the stock manifold can be made to flow that much with some work (closing up the EGR ports, porting, etc) then the Holley 390 is a waste...so will be the EFI as well but it has many other advantages also. At the end of the day it’s possible that it will take as many or more $ to go this route because of the machine work involved...There are some that are convinced the entire Holley/Offy thing is about looks. That a stock intake and Ford 2 bbl carb make as much power as the expensive beautiful parts. Me, I don't know, but tend to be suspicious.
Bill
Performance wise probably about the same but Fitech has a reputation for horrible customer service...if everything works correctly you probably wouldn’t notice the difference between the two.What's the difference between the Holley and FITech units?
Here's another story I have a V8 Alpine with Crate motor from Blue Print engines on researching FI for that motor I talked to BP answer was Sniper we get more performance with Holly than others. And I asked about Fitech and others and the answer was Holly.Performance wise probably about the same but Fitech has a reputation for horrible customer service...if everything works correctly you probably wouldn’t notice the difference between the two.
The good news is Holley makes a 2 barrel EFI which is right in this CFM range. The injectors are suited perfectly for this engine. In terms of cost, you will have to get the emission holes filled and have an adapter put on for the Holley bolt pattern because there is an emission adapter that is fitted to the original intake. Not too much added cost. Now I am kicking myself for not doing this when I had the chance.The little bit I know about this stuff makes me dangerous but the limiting factor in the equation is the engine itself...from what I understand, at 100% volumetric efficiency it can only handle about 270 cfm at 5500 rpm...if the stock manifold can be made to flow that much with some work (closing up the EGR ports, porting, etc) then the Holley 390 is a waste...so will be the EFI as well but it has many other advantages also. At the end of the day it’s possible that it will take as many or more $ to go this route because of the machine work involved...
Actually haven't decided on the cam yet...something we're talking about right now....hoping to use a roller cam but not yet sure if there are any suitable roller rockers, lifters, etc., that will work in the 2.8Bill, looking forward to your intake comparison! What cam are you going to use?
Perfect!Some more progress....all the structural work is nearly done. Interior is epoxy primed and a coat Lizard Skin applied. The cross member is back from the powder coater and ready to start assembly of the front end. After a year of rust repair, structural upgrades and mods to accommodate the 2.8 V6 and A4LD transmission, we're actually about ready to start body and paint work!
Media blastingHow did you get the underside so clean?
Bill
we fabbed a combo transmission mount and reinforcement plate for the x-frame.