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Which head is best for 250 xflow 4.1??? 

 

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 Post subject: Which head is best for 250 xflow 4.1???
Posted: Thu Jul 13, 2006 8:02 pm 
Getting Side Ways
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hey guys
ive been surfing around and noticed that there and few different heads for the motor ive seen the C1 head and C2 i was wondering what other ones there and and what would be best for performance use
thx
jason

 

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Posted: Thu Jul 13, 2006 8:11 pm 
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C1 and C2 are carby heads. E1 and E2 are efi heads and are apparently better.

 

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Posted: Thu Jul 13, 2006 8:14 pm 
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Cant remember the code on the side but the best heads to use are the injected ones. These have a plain kidney shaped chamber. If you are lucky there is a version of this head called a redwood head. It had slightly larger valves. The ones to steer away from are the cast iron ones (obviously! :lol: ) and the eraly xds and es. These have a chamber shape sort of like a distorted pacman mouth. The piece sticking into the chamber creates a hotspot which needs to be ground off before it is put back on. The casting on the side actually denotes the type of vehicle it came off. I used to have all these codes when I worked in the trade but seem to have misplaced them.
Hope this helps. 8-)

 

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Posted: Thu Jul 13, 2006 9:46 pm 
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ok
i was going to go efi head but just wasent sure what ones best.

what head got better valve stem seals(umbrella or other)

not alloy head and efi

 

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18" koya Strykers, AU engine with port and polish EB head, crow valve springs, standard cam, Large aftermarket RX7 turbo, T5 manual 3" intercooler piping, 600x300x100 intercooler core, MSII with innovate wideband O2 sensor and guage. BA F6 bodykit

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Posted: Thu Jul 13, 2006 10:03 pm 
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The EFI ones had clip ons (I think) If it hasnt you can fit 4l ones easily

 

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Posted: Sat Jul 15, 2006 12:48 pm 
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Early alloy heads, s1 and s2 upto 85..? had the kidney shaped chambers.
About 86 they brought in the heart shaped chambers which look similar to the EA type chamber. Which helped with emissions but not that good for power. Valves are severely shrouded etc. Look for a XE or 84 - 85 XF EFI head. All alloy heads use 39mm exhaust valves, but the injected head has larger inlet valves and seat to match. Head still needs work to the ports mainly in the short turn radius, just above the valve seat and around the valve guide boss. Most of this work needs to be concentrated to the exhaust, though the efi heads have larger inlet valves and seats, the port just above the valve seat was never machined from the factory to suit the larger internal diameter of the larger seat.

 

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