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Join Date: Apr 2007
Location: Seattle
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Twin plug valve covers
So, I知 finally getting close to finishing up my motor. I知 going with twin plugged large port SC heads and I need to drill out my lower valve covers.
Can any of you guys provide me with a paper template ? Or I can work off of measurements as long as there accurate. Cheers, Paul ![]()
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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If you just look in the used parts section usually you can find a set of aluminum 964 lower valve covers and you don't have to drill anything
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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Yah, that’s true. And appreciated info but, I already have a spare set of 930 covers.
Someone out there must be able to pull some measurements for me. Anyone??? Bueller... Bob Cox............
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Here痴 a pic I just took for you.
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Perfect. That sir, is exactly what I needed. I didn’t realize the CL of those two holes lines up with the interior casting webs. Any chance you can enlighten me on the partial hole ? Seams like about 3/4 of the hole is drilled ?
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Actually, after a closer look, it seams only the center hole is lined up with the CL of the casting ridge
I’m sure I can get close enough on the fist hole. I just need to suss out the partial hole.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Here you go.
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I guess the spacing will be equal so, your pic should give me the info.
Thx again
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Perfect
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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I love document my prosess in the event that anyone gives two sharts. But, be warned, I’m a nail bender. There will be wood involved.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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A little google foo turned up an old post that Craig Cgarr replied to. Apparently its 4.64 or about
4-5/8” from the edge of the half hole to the CL of the middle hole. He said it works to go off of the center of the top ridge but he likes to grow about 1/16” lower. I’ll post my results. Good, bad or butchered beyond use.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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To clarify it’s 4.64 CL of hole to CL of hole.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Work in Progress
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The 964 valve covers work but do have their own challenges. If I recall correctly you have to either replace all the studs on your cam towers or you have to drill out each hole on the 964 valve cover. I bought a set a few years ago and found that it was more work than I anticipated.
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB -Marine Blue '87 930 |
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Yah I think most people drill em out.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Put your COPS or wires on your plugs and take some measurements on your heads. Or a piece of small diameter metal tubing tapped for the plug cap thread would be better to get accurate measurements for the CL of the holes.
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I’m all good. Thanks for the assistance
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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Sounds like you got dimensions. If not, i have them.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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Yep, I知 all set. Thanks though. Most appreciated
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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