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drilling valve cover for adjustment holes!
Posted by: GWLee ()
Date: December 06, 2018 07:40AM

Ok I thought I had read, sometime back, that someone posted a template to drill valve covers for valve adjustment? I have searched and looked at the faq, but don't see it.

So does anyone have tham I could print or it may have just been a drawing with the measurements.

I'm doing a static adjustment first, but if need be, I will follow it up with a running adjustment.

Thanks

Lee Adkins

A Cave Man car
1960 2dr Coupe with pg
Color Tasco Turq.
With Ermine white top.

Catlettsburg,
In the Beautiful state of
North/East KY!

Not the best pic, but the only I had from then, 1997!

2016!

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Re: drilling valve cover for adjustment holes!
Posted by: MattNall ()
Date: December 06, 2018 07:51AM

Remember they are not all in a straight line.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo




Edited 1 time(s). Last edit at 12/06/2018 08:29AM by MattNall.

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Re: drilling valve cover for adjustment holes!
Posted by: Allan Lacki ()
Date: December 06, 2018 08:06AM

It would be great if someone could make a paper template for drilling the holes.

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Re: drilling valve cover for adjustment holes!
Posted by: larry202br ()
Date: December 06, 2018 08:32AM

Nice, then install some duckbill valves, and leaks are minimized.

1961 rampside with a 65 / 67 110 engine, car four speed.
1965 convertible
1966 Custom two door/four door

KC0SKX
Olathe, ks
HACOA

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Re: drilling valve cover for adjustment holes!
Posted by: Lane66m ()
Date: December 06, 2018 05:17PM

Here is the info from another post about the issue I found with the 1/3 cover and didn't want to repeat with the drilled hole covers we did. The only thing I didn't mention about the cover was it was NOT a homemade cover. It was purchased from Clark's. So the quality of the cut was excellent.

If you drill all your holes with the bottom at the ridgeline, I will be willing to bet you will be having trouble slipping the socket straight one on a couple of the rocker nuts.

[corvaircenter.com]

We did try the 1/3 cover and had difficulty getting the 5/8" socket on and off on some rocker nuts. These covers are trimmed along the ridge line down from the centerline of the cover. Our covers were drilled as described below for the 5/8" socket (0.840 dia) and some 1 1/8 holes we drilled were below the ridge line. So the magnets will slow down most of the oil that attempts to escape. We might wind up using aluminum tape applied on a clean cover. Pulled down for adjustment and pushed up for closure. Doesn't have to stick, just be close enough to dribble oil that gets on it back into the cover.

MODIFICATION OF VALVE COVER
We bolted up our covers on a removed head and turned it upside down. Then we dropped a 1/2 drill bit down each lower mount hole in turn and tapped the drill bit with a punch and hammer. We noted that the line of bumps in the cover were not in line. Since we had no slop in the drill bit to the hole, it only confirms some of the lower mount holes are lower on the head than others. Thus the reason for some difficulty on some rocker nuts and not others. Covers were drilled with 1 1/8" hole saw for the 5/8" socket (0.840 dia) in a drill press. 1/8 holes were drilled first for pilot holes.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: drilling valve cover for adjustment holes!
Posted by: GWLee ()
Date: December 07, 2018 06:05AM

Thanks all for the info. As Allan mentioned, it would be nice if someone made a pattern.

I do remember seeing one somewhere just can't find it now.

But I got the static adjust done yesterday, and may just run it and see how well it was done.

I used Steve G's method for adjusting them. Though I've done them by the service manual before.

Hopefully it doesn't need any more adjustment but if it does I'll just do it and be done, without drilling the covers.

Just decided not to waste a set of valve covers for something I will not use, often.

Thanks guys!

Lee Adkins

A Cave Man car
1960 2dr Coupe with pg
Color Tasco Turq.
With Ermine white top.

Catlettsburg,
In the Beautiful state of
North/East KY!

Not the best pic, but the only I had from then, 1997!

2016!

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Re: drilling valve cover for adjustment holes!
Posted by: Lane66m ()
Date: December 07, 2018 07:49AM

he pattern is in the Corsa Technical Guide. Volume I, Tools Section Page 6. I made a larger copy for my files.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp





Edited 1 time(s). Last edit at 12/07/2018 07:52AM by Lane66m.

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Re: drilling valve cover for adjustment holes!
Posted by: davemotohead ()
Date: December 07, 2018 10:12AM

smoking smiley





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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