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Old 04-15-2009, 06:03 PM   #1
wrxej205
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Default valve clearance on stock heads with 280bc cams

i was surfin around on here when i came across a thread about a guy saying something about valve clearance. which got me kinda mortified for a minute or two thinkin if i even bothered to check let alone take it into consideration when i was doing my build. heres the specs on my build


new sti 2.5 all stock sb
cometic head gasket.
arp studs
stock old 2.0 heads unpolished and unbored
280 bc cams springs, retainers etc.
all new exhaust valves, shims, buckets, seals and etc on the heads.


now with upgrading to that bigger lift and duration do any of you think ill have a problem of it hitting the piston?

thanks jordan
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Old 04-15-2009, 10:18 PM   #2
john 1badSTI
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no you should be ok you just have to check valve clearance between the bucket and the cam lobe because if the cams are new after they did the heads the clearances will probably be off.
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Old 04-15-2009, 10:47 PM   #3
Team Scream
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Quote:
Originally Posted by wrxej205 View Post
now with upgrading to that bigger lift and duration do any of you think ill have a problem of it hitting the piston?

thanks jordan
Why not be 100% certain and check with clay before you commit the heads to the short block permanently ?
Sure be a bummer to get it all back together and then find out the hard way no?
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Old 04-16-2009, 12:28 AM   #4
wrxej205
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dude thats my point my motor is all together ready to go, im waitin on my tranny i was hoping just to find someone on here who ran 280s in a simular setup with no problems.
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Old 04-16-2009, 10:21 AM   #5
wrxej205
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anybody?
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Old 04-16-2009, 10:30 AM   #6
mick_the_ginge
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What's the lift? The duration of the cam does not extend the valve any further into the cylinder the lift does.

What size head gasket?

What did you set the valve lash to?
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Old 04-16-2009, 10:38 AM   #7
wrxej205
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Race Specification
Longer duration profile, added rpm potential. Intended for fully built engine. Tuning and ECU mods recommended. Requires kit BC0600. BC0602

114 280/280 234/234 .425"/.425" 10.80/10.80 BC0600

USDM EJ205 (’02-’04 WRX) Stock 256/256 205/205 .365"/.361" 9.27/9.17
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Old 04-16-2009, 10:40 AM   #8
wrxej205
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100mm standard thickness cometic gasket.

as far as valve lash, i had a subie tech build my head, he knows nothing of aftermarket so i imagine whatever they would normally be.
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Old 04-16-2009, 10:50 AM   #9
mick_the_ginge
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10.8mm lift. You will be fine IMO. You should be able to run upto 11mm with or without AVCS. More lift without AVCS

Last edited by mick_the_ginge; 04-16-2009 at 11:15 AM. Reason: Clarification
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Old 04-16-2009, 11:02 AM   #10
wrxej205
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without issue with AVCS and more without AVCS????


you mean i should be fine cuz im not running avcs, i got more room
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Old 04-16-2009, 11:14 AM   #11
mick_the_ginge
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Updated post above to be clearer (Is clearer even a real word?)
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Old 04-16-2009, 11:16 AM   #12
wrxej205
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i think its clearerer
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Old 04-16-2009, 01:00 PM   #13
Hayaboosted
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Quote:
Originally Posted by wrxej205 View Post
100mm standard thickness cometic gasket.

as far as valve lash, i had a subie tech build my head, he knows nothing of aftermarket so i imagine whatever they would normally be.
That is incorrect. BC Stage 3's dont use the factory clearances.
When you buy them new they come with a spec sheet. Mine currently is at the machine shop otherwise I could give you the correct valve lash.
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Old 04-16-2009, 01:13 PM   #14
kevinh211
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Quote:
Originally Posted by Hayaboosted View Post
That is incorrect. BC Stage 3's dont use the factory clearances.
When you buy them new they come with a spec sheet. Mine currently is at the machine shop otherwise I could give you the correct valve lash.
BC asks for .008" intake and .010" exhaust lash.
and i THINK the factory specs are .008" intake and .012" exhaust.
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Old 04-16-2009, 01:16 PM   #15
mick_the_ginge
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It's really the valves that drive the lash requirement, not the cam. The valves grow more with heat than the cams do.

Most aftermarket setups call for 8 thou intake lash and 10 thou exhaust lash. Stock calls for 8 thou intake and 13 thou exhaust. If you did stock lash then you are fine, it's what i did as part of my last refresh.
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Old 04-16-2009, 05:12 PM   #16
wrxej205
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i just tried callin the guy who built my heads waiting on his call back about the specs he built em on.
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