Setting valves different on an inline 6 vs a v8? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

2bits · 10-08-2007, 10:06 PM

My rebuilder said that you don't set the valves the same way... (loosen 'til it clatters, tighten 'til it goes away, then 1 more half turn). Can anyone confirm?

68gmsee · 10-08-2007, 10:19 PM

I've always done mine the same on 6 cylinder and 8 cylinder. Haven't had any problems yet.

On the last overhaul I did I went 3/4 turn instead of a full turn, though.

67_C-30 · 10-08-2007, 10:22 PM

Unless it's a got a solid cam (doubtful) they will be set the same way as a V8 with a hydraulic cam. It's better to get the lash out, and go 1/4 turn. There's no need to a go a 1/2 turn.

**Boog** · 10-08-2007, 10:42 PM

1/2 to 3/4 turn is the norm regardless of what a repair manual says. Always works for me.

67_C-30 · 10-08-2007, 11:04 PM

Quote:

Originally Posted by Boog

1/2 to 3/4 turn is the norm regardless of what a repair manual says. Always works for me.

You can run them that way, but the more you tighten the rocker, the quicker the valves will float at high rpm. Now on a L-6, this is a moot point, but on any kind of street performance engine you should go 1/4 turn MAX. On bracket race cars with hyd cams, the norm is an 1/8 turn. I know this is not a race or performance engine, but same rules apply.

Will it run fine at 1/2 turn? Sure, but there's no need to do it. The more you crank down on it, the greater the chance of wiping out a lobe. I have run bone stock engines for 200,000+ miles with no need for re-adjustment.

2bits · 10-09-2007, 03:45 PM

I had always heard 1/2 turn but I have no experience. Why is it a moot point for an L6 though? Thanks for all the good info.

BCOWANWHEELS · 10-09-2007, 05:39 PM

i do my I-6 ENGINES AT 1/2 TURN but i never hi-rpm them. 1/4 to 1/2 will be fine. got me thinkin on the 1/4 turn now !!!!!!!!

67_C-30 · 10-09-2007, 05:54 PM

Quote:

Originally Posted by 2bits

I had always heard 1/2 turn but I have no experience. Why is it a moot point for an L6 though? Thanks for all the good info.

Just because the cam and induction is not going to let the engine rev high enough to need the extra RPM capability.

2bits · 10-09-2007, 06:23 PM

I am taking Friday off so I am going to get them set then and lets hope this is all it is!

10-08-2007, 10:06 PM	#1
2bits Registered User Join Date: Jan 2006 Location: Dallas Posts: 504	Setting valves different on an inline 6 vs a v8? My rebuilder said that you don't set the valves the same way... (loosen 'til it clatters, tighten 'til it goes away, then 1 more half turn). Can anyone confirm? __________________ _______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club

10-08-2007, 10:19 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Setting valves different on an inline 6 vs a v8? I've always done mine the same on 6 cylinder and 8 cylinder. Haven't had any problems yet. On the last overhaul I did I went 3/4 turn instead of a full turn, though.

10-08-2007, 10:22 PM	#3
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Setting valves different on an inline 6 vs a v8? Unless it's a got a solid cam (doubtful) they will be set the same way as a V8 with a hydraulic cam. It's better to get the lash out, and go 1/4 turn. There's no need to a go a 1/2 turn. __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

10-08-2007, 10:42 PM	#4
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: Setting valves different on an inline 6 vs a v8? 1/2 to 3/4 turn is the norm regardless of what a repair manual says. Always works for me. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

10-09-2007, 03:45 PM	#6
2bits Registered User Join Date: Jan 2006 Location: Dallas Posts: 504	Re: Setting valves different on an inline 6 vs a v8? I had always heard 1/2 turn but I have no experience. Why is it a moot point for an L6 though? Thanks for all the good info. __________________ _______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club

10-09-2007, 05:39 PM	#7
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Setting valves different on an inline 6 vs a v8? i do my I-6 ENGINES AT 1/2 TURN but i never hi-rpm them. 1/4 to 1/2 will be fine. got me thinkin on the 1/4 turn now !!!!!!!! __________________ I BELIEVE IN JOHN 3:16

10-09-2007, 06:23 PM	#9
2bits Registered User Join Date: Jan 2006 Location: Dallas Posts: 504	Re: Setting valves different on an inline 6 vs a v8? I am taking Friday off so I am going to get them set then and lets hope this is all it is! __________________ _______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club

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