yo, yw
1. May be a stupid question but in that post I read. It talked about no air pump. What is that and where is it located on my 86 302 efi. The gt40 not having it. Will that effect my truck or do I just eliminate mine. Or how does that all work; The folks who installed the GT40 heads said some heads have the Smog Sys air ports and some don't have them; one person who did the GT 40 install in his Bronco said; "...GT 40 heads I have taken from Marine Applications were ported. They obviously were not used and had the (best described as ) "helicoil" style female thread plugs in the tap'd holes. I have had several, in fact just did a pair & installed on my 90. My second pair was not drilled & tap'd on the ends, but in the exhaust ports, the humps & air passages were there. My machine shop offered to drill & tap to accept the air tube, as this pair was "cleaner" then the pair I was going to use, but I traded them in return for my machine work."
dan50 said; "...GT40s came in a lot of vehicles.
1) Late 80s-late 90s marine applications
2) 93 Cobra
3) 94-95 Cobra
4) 96-97 1/4 Explorer/Mountaineer
5) 93-95 Lightning
All land use GT40s came with smog ports in the back, some were plugged up. There were also three different combustion chamber sizes - Cobra, Explorer, and Lightning/Marine. Don't know if Marine heads had smog holes, or if they were just plugged up..."
See the thermactor ports in this aricle;
http://www.hotrod.com/projectbuild/1939_ford_tudor_engine_build/index.html
you'll have to check each for that; the smog (called thermactor) pump will be on passenger side, low
as shown in these diagrams by Ford via Steve83
pic, Bottom View in an 88 5.0 (Click NEXT to view 2nd pic)
Source: by Jem270 at SuperMotors.net
Operational Description & pic; This pumps fresh air into the exhaust system, to burn left over hydrocarbons, lowering emissions. The computer uses 2 air valves (TAB & TAD) to control where the air flows depending on engine operation. Thermactor Air Bypass (TAB) shunts air to the atmosphere, when no air is needed. When air is needed it sends air to the second valve TAD. Thermactor Air Diverter (TAD) diverts air either to the exhaust manifold, or directly to catalytic converter. MIESK5 NOTE; If da Engine Coolant Temperature Sensor (ECT) is Below 50 degrees F, then TAB is grounded & sends air to atmosphere; If Between 50 and 190 Degrees F, Bypass Valve sends air to Diverter and to Manifold; If Over 190 Degrees F, it is in closed loop & Air goes to Catalytic Converter; Bypass when at idle/Wide Open Throttle (WOT), and with failing Oxygen Sensor. The fastest way to see if vehicle is in open loop is to see where the air is going; to Catalytic Converter, it is in Closed Loop; to Atmosphere or Manifold it is in Closed Loop, provided the thermactor system is working
Source: by Ryan M (Fireguy50) at fordfuelinjection.com
My link
2. Will my stock exhuast manifolds match right up for sure.
You can use these on any 289/302/351W engine. All OEM int/exh manifolds will bolt on.
3. My stock intake manifold and pletum will work with those as well? Will I bennefit from swapping in the mustang or explorer intake manifolds along with the gt40 heads.
You can use these on any 289/302/351W engine. All OEM int/exh manifolds will bolt on.
If you're keeping stock exhaust, then save more $ by not getting eoither stang/splorer stuff; or get either if you're upgrading exh sys later, but am not sure if hood clearance will be an issue, prob not.
4. My power steering bracket bolts to the head. With this work with the gt40 heads?
Most accessories brackets bolts on with no problems. A machine shop can make it work if the heads don't have the bosses or holes for the bracketry.
See what needs to bought or done for your Broncos Air Injection system to match up w/the GT40 heads. Aagin, all info is from others.
GL!
