An EF/EL head will bolt straight on to an EA - ED block. I have an EF head on my ea. Also the EF/EL manifold will bolt onto an EA head. So really theres a lot thats interchangable, but with the ef manifold use ea injectors, and somehow limit the regulator to 250kpa to stop rich running as ef/el is 275kpa
So a 4L ef/el head will bolt straight onto the 3.9L block without any hassels at all? I am looking at replacing my head and rings etc. in the near future and i might look into getting an ef/el head if thats the case.....
EA Fairmont Ghia : 3.9L MPFI, 2.5" cat back sports exhaust, K&N panel filter. Pioneer head unit, pioneer 4" three way fronts, Pioneer 6" 3 way rears, 2x 12" subs, blue interior light.
My main pride and joy : '76 XB Fairmont GS, 250CI, 140,000 Km and all stock.... for now! (Factory air-con on the way)
I'm running a standard EA block. The head is the original EA, recoed with port & compression modifications.
I have the EF intake, EL Rocker gear, EF Rocker cover, AU Lifters & TPS, EA ISC & Injectors, XR pressure reg, VDO fuel pump, EA 5 speed ECU (rev limit 5500, no speed limit) and a custom manifold module.
If you are going to put an EF/L head onto your EA block, it would be wise to take some measures to increase the compression. The standard EA comp is aprox 8.8:1. Bolting on the EF head will reduce this even further because of the chamber design.
NZ would be the one who can tell you the most about gains from running an EF head.
There are an enormous amount of interchangeable parts between EA-AU... its good fun.
How to get it all working together... many hours in the garage :s2:
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