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#1
04-12-2018, 03:32 PM
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Cometic MLS Head Gasket Dowel Holes
Has anyone had trouble installing these head gaskets lately. It appears one dowel hole is slightly smaller than the other and will not slide over the dowel pins in my block. My old ones fit fine. Can you drill or ream the hole larger?
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#2
04-12-2018, 08:59 PM
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Take a small socket that just fits over the dowel and tap them on it will be fine
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#3
04-13-2018, 04:08 AM
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That just happened to me. Its the center to center distance between the front and back dowel holes in the gasket . There off from the dowels in the block. I got mine on but what I don't like is the gasket didn't lay flat, it had a slight ripple in it after getting it to fit down over the dowels... I just torqued the head down over it. But next time ill file the hole until it goes on with no effort...
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My Half AN Injun..... |
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#4
04-13-2018, 09:47 AM
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
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#5
04-13-2018, 10:15 AM
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I will file the one hole slightly too Charlie.
A few minutes of work and a air/spray wash and back in business. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#6
04-13-2018, 12:27 PM
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Just had same problem with SBC filed holes do it with the Pontiac gaskets to
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
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#7
04-13-2018, 09:55 PM
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My Half AN Injun..... |
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#8
04-14-2018, 12:30 AM
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#9
04-14-2018, 05:53 AM
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My Half AN Injun..... |
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#10
04-14-2018, 08:11 AM
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Over-thinking comments just means that you really do not care about doing it correctly or are lazy in your engine builds.
The gasket is telling you something. either it is slightly wrong or the dowel pins in that Pontiac block are slightly closer together. Would assume nothing on that deal. But a GREAT Engine Builder Richie Hoffman has posted that he files the hole. That is good enough for me (who also files the hole). No overthinking, just "thinking period" vs shade tree stuff. I have seen a ton of shadetree outfits that completed a job quickly, even from some "machine shops" who should know better but they were also lazy and just want the money. But you go right ahead and do it "your way", this is America, but don't reply with a negative comment just because I agree with Richie and Charlie. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. Last edited by Tom Vaught; 04-14-2018 at 08:19 AM. |
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#11
04-14-2018, 08:50 AM
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Thanks Tom...
If the gasket material is rippling as the straight edge of the head is baring down on it, it starts to fatigue as the head forces it to distort / wrinkle somewhat in the area it finally settles down at. I've done it and had the gasket fail at high boost levels. After taking it off and setting it on down on the bench it was not laying flat anymore in that area. Its was effected . After you torque the head down like that , take a look at the side view where you can see it sandwiched between the head and the block from the valley pan area and you will see a wave in the overhanging part of gasket. That explains it all... Clamped down or not it stays wrinkled ..
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My Half AN Injun..... |
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#12
04-14-2018, 09:10 AM
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#13
04-14-2018, 09:23 AM
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#14
04-14-2018, 10:11 AM
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Ah, But you are a NA Guy that made 810 NA, and a good number there.
Charlie, with 1/2 the engine you have (4 cylinders) made basically the same HP number on boost. So you could say that the cylinder pressures that the gasket was seeing MIGHT be a BIT different. Can you agree with that? So a generic statement, by you may not apply here. You "force" the gasket over the dowel and we file the hole, and let it lay flat as designed. BUT "warm and fuzzy" IS DIFFERENT FOR DIFFERENT PEOPLE. Have a great day. If a third person is reading the posts they should be able to decide which way THEY want to go. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#15
04-14-2018, 02:10 PM
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Generally speaking, the harder you push an engine, the fewer shortcuts you can get away with.
Eric
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"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
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#16
04-14-2018, 02:13 PM
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GTO George |
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#17
04-14-2018, 02:42 PM
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#18
04-14-2018, 02:45 PM
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#19
04-14-2018, 02:49 PM
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Sometimes its better to ignore people who haven't /or can't done/do it. GTO George |
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#20
04-14-2018, 03:08 PM
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Read the whole thread George, I ALREADY said that I have filed the too small hole in the gasket IN THE PAST, Just like Charlie and Richie H.
Did you fail 3 grade reading George or are you just trying to stir the Chit like every other post? I think you just a bored drag racer. By the way how did your recert go that was supposed to happen? Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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