play allowed on valve stem inside the guides ? 350 L05
03-25-2013, 08:51 AM
#1
Junior Member
Thread Starter
Join Date: May 2008
Location: Grenade - France - Europe
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: Buick RMW 92
Engine: L05 5.7L V8
Transmission: 4L60
Axle/Gears: 2.73
play allowed on valve stem inside the guides ? 350 L05
Ok, I have removed the heads (casting 193) of my 1992 L05 350ci engine (from a 92 Caprice).
I want to check the play of the valve stems inside the guides.
Has anyone got the values ???
Are they the same if I have steel guides or bronze guides installed ?
(machine shop waiting for the figures ...)
thx !
I want to check the play of the valve stems inside the guides.
Has anyone got the values ???
Are they the same if I have steel guides or bronze guides installed ?
(machine shop waiting for the figures ...)
thx !
Last edited by Jabpir8; 03-25-2013 at 11:56 AM.
03-25-2013, 11:53 AM
#2
Junior Member
Thread Starter
Join Date: May 2008
Location: Grenade - France - Europe
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: Buick RMW 92
Engine: L05 5.7L V8
Transmission: 4L60
Axle/Gears: 2.73
Re: play allowed on valve stem inside the guides ? 350 L05
I got 0.0011" max of lateral movement near the guide but someone tell me this is quite low.
03-25-2013, 12:17 PM
#3
Re: play allowed on valve stem inside the guides ? 350 L05
Intake 0.0015" to 0.0016"
Exhaust 0.002" to 0.0025"
I would say you're not getting an accurate measurement if you're getting .0011" max, and this is coming off an engine that has some mileage on it.
Exhaust 0.002" to 0.0025"
I would say you're not getting an accurate measurement if you're getting .0011" max, and this is coming off an engine that has some mileage on it.
03-25-2013, 12:35 PM
#4
Moderator
Join Date: Jan 2000
Location: Mercedes Norte, Heredia, Costa Rica
Posts: 20,981
Likes: 0
Received 9 Likes
on
8 Posts
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: play allowed on valve stem inside the guides ? 350 L05
.001" intake and .0015" exhaust is a pretty normal target for new.
Last edited by Apeiron; 03-25-2013 at 07:21 PM.
03-25-2013, 06:31 PM
#5
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,117
Received 1,688 Likes
on
1,283 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: play allowed on valve stem inside the guides ? 350 L05
.002" - .003" is typical for good used. Up to about .005" can be tolerated if you don't mind a slight blue puff now and then.
.0011" is not right; no way you can measure that down to one ten-thousandth of an inch.
.0011" is not right; no way you can measure that down to one ten-thousandth of an inch.
03-25-2013, 07:21 PM
#6
Moderator
Join Date: Jan 2000
Location: Mercedes Norte, Heredia, Costa Rica
Posts: 20,981
Likes: 0
Received 9 Likes
on
8 Posts
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: play allowed on valve stem inside the guides ? 350 L05
Maybe it was .011"?
03-25-2013, 07:31 PM
#7
Member
Re: play allowed on valve stem inside the guides ? 350 L05
.015 is what to aim for.
Trending Topics
03-26-2013, 09:23 AM
#8
Junior Member
Thread Starter
Join Date: May 2008
Location: Grenade - France - Europe
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: Buick RMW 92
Engine: L05 5.7L V8
Transmission: 4L60
Axle/Gears: 2.73
Re: play allowed on valve stem inside the guides ? 350 L05
OK,
so managed to get the values from a service manual (1992)
QUOTE
Stem Clearance
Production
Intake & exhaust 0.027-0.069 mm (0.0011" - 0.0027")
Service
Intake 0.093 mm (0.0037") MAX.
Exhaust 0.119 mm (0.0047") MAX.
UNQUOTE
My car has got 135,000 miles.
The measured values measured are around 0.15 mm (0.0059") MAX of stem clearance as close as possible to the end of the guide (at 0.4/0.05" front the end due to poor access). So real clearance is a bit lower but not that much.
The guy at the shop said the play is not that bad.
But I have a set of new guides and new valves.
Now, price to drill the heads (there are no guides from OEM) and install new guides is killing me (250 EURO per head) but I think I have no choice ...
so managed to get the values from a service manual (1992)
QUOTE
Stem Clearance
Production
Intake & exhaust 0.027-0.069 mm (0.0011" - 0.0027")
Service
Intake 0.093 mm (0.0037") MAX.
Exhaust 0.119 mm (0.0047") MAX.
UNQUOTE
My car has got 135,000 miles.
The measured values measured are around 0.15 mm (0.0059") MAX of stem clearance as close as possible to the end of the guide (at 0.4/0.05" front the end due to poor access). So real clearance is a bit lower but not that much.
The guy at the shop said the play is not that bad.
But I have a set of new guides and new valves.
Now, price to drill the heads (there are no guides from OEM) and install new guides is killing me (250 EURO per head) but I think I have no choice ...
Last edited by Jabpir8; 03-26-2013 at 09:31 AM. Reason: typo
03-26-2013, 09:50 AM
#9
Re: play allowed on valve stem inside the guides ? 350 L05
When you do new guides you need to redo the seats and valve job because its near impossible to get new guides in that keep valve at the right angle with the current seats. Thats probably where the cost is coming from
I am in this position right now. My play was so bad its amazing i didnt drop a valve
probably over .030" haha. Thats what bad rocker geometry will do
I am in this position right now. My play was so bad its amazing i didnt drop a valve
probably over .030" haha. Thats what bad rocker geometry will do
03-26-2013, 10:29 AM
#10
Senior Member
iTrader: (1)
Join Date: Sep 2006
Location: Canada
Posts: 962
Likes: 0
Received 13 Likes
on
10 Posts
Car: 1979 Malibu
Engine: Blown LSx
Transmission: T56 Magnum
Axle/Gears: 9"/wavetrac/35's/3.70
Re: play allowed on valve stem inside the guides ? 350 L05
To the original poster, On a new typical bronze guide deal we set them at 0.0014 intake and 0.0018" exhaust. Anything above 0.0028-0.003 dosnt pass.
Thread
Thread Starter
Forum
Replies
Last Post
