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06-20-2017, 12:57 PM | #21 |
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Re: cometic head gaskets
Looks like a broach was used, certainly not CBN or grinder.
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Phil Molski S/C 1623 |
06-20-2017, 01:03 PM | #22 | |
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Re: cometic head gaskets
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I was thinking about this a little. Do you have a picture of the entire deck surface in one shot ? Did it look like it was done in two different cuts ?? I have seen some Dart blocks come with a pretty terrible finish from the factory that almost looks like they made two passes with different cutters. I does not matter because I am going to surface it anyway but I wonder if yours is just the factory finish ? Just thinking out loud
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Bill Koustenis |
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06-20-2017, 01:35 PM | #23 |
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Re: cometic head gaskets
Milling machines like a Storm Vulcan 85 B can leave a poor finish if the carbide cutters are not kept sharp and or the speed is too fast.
You hit some weld spots on factory blocks and just general wear causes them to leave a "file finish"after a while. I ran one for years..... I never got to use the CBN cutters and we never had a grinder.... Wheel had to be crated up and sent out or replace your own cutters but that was usually not a good scenario.......all it took was one cutter to be slightly high or low.... I have an old Van Norman rotary broach at home and it's a real dinosoar.....it needs to go to the scrap pile....
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Rich Biebel S/C 1479 |
06-20-2017, 01:41 PM | #24 |
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Re: cometic head gaskets
I remember those days well. I used to spend hours getting the new bits set up perfect. So glad for modern technology
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Bill Koustenis |
06-20-2017, 10:59 PM | #25 |
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Re: cometic head gaskets
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06-20-2017, 11:55 PM | #26 | |
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Re: cometic head gaskets
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I do not have an overall pic of the decks but it was definitely just one pattern. No return travel pattern or variance other than how it looked like an angular path as mentioned before. If I recall correctly, the deck height was 9.804. seems like not alot left for a factory cut. I will be running some Fel-pro 1057 (wire ring composite) gaskets for this go-round. Thanks Bryce |
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06-21-2017, 03:05 PM | #27 | |
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Re: cometic head gaskets
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I'm going to file that away with my old guy tricks.... I hope that you don't mind me stealing it.... That how I will re-torque in the future, even though I don't have sealing problems.... I don't think that would work with head bolts that have the bolt holes that extend into the water jacket??? Would breaking the bond of sealer between the bolt threads and the tapped hole cause a coolant leak??? My Pontiacs have blind holes and now that studded blocks are legal it isn't a problem for my race engines. So I am gathering info for other projects.... Thanks again for the info... Bob
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Bob Mulry 7516 STK A & M Motorsports |
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06-21-2017, 03:30 PM | #28 | |
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Re: cometic head gaskets
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06-21-2017, 04:22 PM | #29 |
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Re: cometic head gaskets
I have a simple practice that I use with MLS gaskets. The problem is with the stretch of the fastener. I use plenty of copper coat ( like a whole can on two gaskets). After the head is torked on, I let it set 24 hours. Then, "one at a time", I untork the fastener and re tork it to spec with one pull on the tork wrench. I've actually had motors stop weeping, doing this on the dyno. Right or wrong....works for me.
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06-21-2017, 04:43 PM | #30 | |
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Re: cometic head gaskets
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