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Ford Crossflow 6 Alloy Head Information Print E-mail

From Crossflow Guru XRGlen on XFords.com

myth#1... all x-flow heads are closed chamber type.. there is not and never was an "open chamber" head.. all heads have a good 5-8mm of quench area on each side of the combustion chamber making them all closed chamber..

myth#2... the first early XD alloy head was the same as the XE head but it didnt have injector bossess which makes no difference in flow.. they both had a 57cc chamber.. the E1 head was the same but fitted with a 1mm larger inlet valve for the EFI motors...

myth#3... some heads do flow better than others and there is some good hp to be gained by swaping to a better head.. there were many different chamber and valve size combos that once matched to the right piston dish, could make better power over stock and im not talking about 1-2kw..more like 5-10kw..

the next head was the C1 and C1A heads fitted to the leaded XFs and had a 51cc chamber and a good swirl ridge around the inlet valve.. these and all other x-flow alloy heads made after this were fitted with the larger inlet valve..

then there was the E2 head which is not very good at all.. it has the worst chamber design and can cause bad detonation problems when used in forced induction motors which they were popular for in the 90s..they also had a 51cc chamber which was oval shaped..

then comes the ulp 1986 onward C2 and C2A heads which had a small 42cc chamber but swirl ridges around the inlet and exhaust valves..
once these ridges are laid back with a die grinder they are a very good head and can make great hp.. with 8.6cc dish ACL race series pistons they give around 11.6:1 comp which is great for big cams and 98 octane fuel...

then there is the D head which is the only one i have not seen.. i have 2 fitted to motors but they are still together.. im told they are close to a C2 head but dont quote me...

there was also an increase in exhaust valve size from the XD-XE series but ALL x-flow heads are over exhausted from standard and this is why ford fitted larger inlet valves to all motors soon after..

the best turbo head is the early unmarked XD-XE 57cc chamber head and is also very good and torquey in N/A motor aswell...

the C1 and C2 series heads are my choise as they flow a little better and are not as old as the XD-XE heads..

alloy heads go soft when they are heated too much and all heads should be hardness tested before you spend big money on it... when new, they had around 120-130 rockwells of hardness but gaskets will not seal if they fall below 65 rockwells.. i dont touch anything below 100 rockwell...it costs nothing to get them checked by your local engine shop and takes 2 minutes...

when testing a head for hardness, you need to check around the head bolt holes as this is where the weak point is...

if you need to weld up corrosion caused by bad coolant, you must shot peen the welds before machining back, to bring the hardness back or you can get gasket leakage problems....

if your building a hot x-flow, DO NOT fit larger exhaust valves as they are over exhausted from standard.. this does not include turbo and nitrous motors which will gain in this area...

i fit 1.84" and std 1.5" exhaust to most of the heads that i rebuild.. but to help with valve seat wear i sometimes fit slightly oversize 1.56" exhaust valves but never 1.60"..

 
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