I am doing valve replacement on a 1997 dohc ej25 , and I'll have to do valve ajustments too. Really currious to know if the later hydraulic lifters and shorter valves can fit in these heads, It would be nice to just replace the valves, lap them in and put it back together. Ordering shims and waiting to put it together is a pain (every 105k or so).
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Hi, another question- ej25 valves
Posted 27 February 2014 - 07:33 PM
Posted 28 February 2014 - 07:22 AM
or - install EJ22 heads instead of the EJ25 heads and use an EJ22 intake manifold and timing belt to match.
probably cheaper than replacing a bunch of valves and no more shim/adjusting madness.
Posted 28 February 2014 - 12:21 PM
Does that significantly affect comp ratios? intake velosities? Power? Fuel efficiency? Any other benifits besides the hydraulic adjusters?
Posted 28 February 2014 - 12:39 PM
there are hydraulic and standard screw type adjusters, you can get what you want.
compression ratio goes up a bit...i don't get into this for performance modifications so i won't comment on this in terms of performance, though in general it seems most folks like the results. and they'll likely comment in a bit.
no annoying valves, improves on the headgasket debacle, cheaper and simpler timing belt and maintenance - all around better.
the EJ22 head bolts are external - so you can have a head off in no time, no removing valve covers, hard to access head bolts, etc.
Posted 28 February 2014 - 02:05 PM
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