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Old 11-02-2011, 01:31 PM   #1
elislider
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Default EJ257 Cosworth cams in v5/6 STi EJ207 heads ?

My next build will have v5/6 STi EJ207 heads. I know you can run USDM STi cams in USDM WRX heads (if you block the oil passages) so I was wondering if the same applies to the v5/6 STi heads. I found a deal on some new cosworth EJ257 mild lift cams and would love to run them if possible.

Followup question: if it IS possible, are the springs and retainers on the v5/6 STi EJ207 heads strong enough to reliably run a higher lift/duration cam or should I upgrade them? If so, what are my options? Is there a USDM equivalent or do I have to find v5/6 specific upgraded springs?

Thanks
-Eliot
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Last edited by elislider; 11-06-2011 at 03:17 PM.
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Old 11-03-2011, 03:28 PM   #2
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also wanted to add that I found another good deal on a full set of Brian Crower stuff:
BC0621 stage 2 Street cams
BC3600/3601 standard size valves
BC0600 springs and retainers

All of that is EJ257 spec (USDM STi) but can any of it be used in the v5/6 STi heads? I was considering getting the Cosworth cams and BC valves/springs/retainers, if possible
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Old 11-09-2011, 01:54 AM   #3
elislider
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well I realized I had a set of USDM WRX cams lying around ('02 i think) and so i test fit those in my v5/6 STi heads. They fit great! however I didnt have the shims and buckets installed to test the lash/clearance but I assume they will fit good, since the cams fit, the rest must all be compatible. Please someone correct me if this is not the case though.

Also I bought the cosworth cams, just couldnt pass up the deal, so I'll be getting those soon and then either some Kelford springs or Crower springs (havent decided). So far this is shaping up to be a nice build

Appreciate any input or feedback from anyone
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Old 11-09-2011, 10:47 AM   #4
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Base circle of all Phase II DOHC cams are the same so adjusting clearance won't be a problem.

As long as you use your cam sprockets (and block off any oil bores in the sprocket face of the cam) you should be fine.
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Old 11-09-2011, 02:14 PM   #5
elislider
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Quote:
Originally Posted by Marnix View Post
As long as you use your cam sprockets (and block off any oil bores in the sprocket face of the cam) you should be fine.
Those were the only 2 things i had planned to do, thank you for confirming my thoughts
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Old 11-10-2011, 03:11 AM   #6
Marnix
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I usually cut M5 thread in the oil bores of the cam (only mating surface for sprocket, not the holes in the front bearing surface obviously) and insert a bolt and grind it off. I also apply some instant gasket to the thread to prevent leakage.
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Old 11-10-2011, 01:05 PM   #7
elislider
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That's what a friend of mine did, tapped them and sunk an insert. I'm going to assume something like filling the holes with JB Weld / Epoxy wont cut it?
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Old 11-10-2011, 01:55 PM   #8
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No not for extended period of time.
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Old 11-10-2011, 09:03 PM   #9
elislider
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how about just a piece of tape? jk jk

I was looking at Brian Crower single springs + retainers vs. Kelford single springs (for use with stock retainers). Any thoughts on the two? Are the Crower retainers an upgrade over stock? or are they just a different shape to fit the Crower springs specifically? Curious what the difference is, if using stock retainers w/Kelford springs is as good as the Crower ones.
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Old 11-13-2011, 02:39 AM   #10
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bump if anyone has insight
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Old 11-13-2011, 09:24 AM   #11
Marnix
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The stock EJ207 cams have limited lift and the springs are designed for that. I believe the Cosworth cams have in excess of 10 mm lift (stock less than 9 mm) so you definately need upgraded springs.
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Old 11-13-2011, 12:48 PM   #12
elislider
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Thank you for the specific info. I was definitely going to be using upgraded springs, but my question was mainly about the retainers. Since the Crower springs some packaged with Crower retainers, and the Kelford springs do not, what does that mean for those Crower retainers? Are they better than stock retainers? Are they just specific for the Crower springs? Both? Does it even matter? (ie. could I use the stock retainers with the crower springs and be perfectly fine?)

Since I know very little about actual valvetrain components, just trying to learn as much as I can.
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Old 11-14-2011, 06:47 AM   #13
Marnix
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If you're going for a dual spring setup you obviously need the retainers aswell. If you sticking with a single spring which fits the stock retainer and you do not care for a lighter item, you should be fine.
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Old 11-14-2011, 04:38 PM   #14
elislider
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I will not be doing dual springs, just singles. Is "lighter" the difference on the Crower retainers? lighter sounds good to me
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