Mertz Posted September 15, 2021 Report Share Posted September 15, 2021 I was cleaning up the inside of the head to remove any carbon. On number 6 I noticed a small hole which I prodded with a sharp point and believe it is blind. What is this hole for and is it blind? Last time I rebuilt a 283 I deburing the intake and exhaust ports. The heads on mine are rough. Would I benefit from deburing them? i have a top end gasket set I bought years ago at a swap meet. Turns out it is for the longer block and I can’t use it. The engine I’m putting in is an industrial engine and has been bored 40 over. NAPA doesn’t have the gaskets. Can I reuse the copper felpro head gasket used on the rebuild? Do I need a different gasket due to the over bore? Quote Link to comment Share on other sites More sharing options...
greg g Posted September 15, 2021 Report Share Posted September 15, 2021 Look closely at the head topside. There should be a pipe plug screwed into the hole. This gives access for a tool to ascertain TDC for cylinder six. Since 1 and 6 travel together, when 6 is at TDC, so is one. This allows you to set static timing when you determine 1 is oncompression. ( 6 IS TDC exhaust) ypo can also insert a long wire to measure an unknown blocks stroke. Quote Link to comment Share on other sites More sharing options...
Mertz Posted September 15, 2021 Author Report Share Posted September 15, 2021 Now that you explained it, I remember now reading that somewhere. I also wondered what the plug was for. There is also a brass fitting on top. Quote Link to comment Share on other sites More sharing options...
billrigsby Posted September 17, 2021 Report Share Posted September 17, 2021 On 9/15/2021 at 3:50 PM, Mertz said: i have a top end gasket set I bought years ago at a swap meet. Turns out it is for the longer block and I can’t use it. The engine I’m putting in is an industrial engine and has been bored 40 over. NAPA doesn’t have the gaskets. Can I reuse the copper felpro head gasket used on the rebuild? Do I need a different gasket due to the over bore? I have reused head gaskets on motorcycles in the past. Not on flat heads because this is my first build, but always on the bikes, you would apply a nice coat of Copper Coat Gasket Spray before assembly with a re-used gasket. Never had any problems going that route. Quote Link to comment Share on other sites More sharing options...
Mertz Posted September 18, 2021 Author Report Share Posted September 18, 2021 I found a good source for the upper end gasket set at advanced auto for $38 so I will get a new gasket and use copper coat. I was concerned about the overbore and gasket matching but it looks like the gaskets are around 3.3 which is larger than stock bore by a bit so my 40 over should still be smaller than the gasket opening. Quote Link to comment Share on other sites More sharing options...
Tooljunkie Posted September 18, 2021 Report Share Posted September 18, 2021 I reused my copper head gasket. Copper coat as well. I ran it 500 miles no issues. Has stuck rings though. Quote Link to comment Share on other sites More sharing options...
chrysler1941 Posted September 18, 2021 Report Share Posted September 18, 2021 I've also used my copper gasket several times but the correct way is to soften with heat until it changes to a red color. 1 Quote Link to comment Share on other sites More sharing options...
Mertz Posted September 18, 2021 Author Report Share Posted September 18, 2021 Do I need to soften a new gasket? Quote Link to comment Share on other sites More sharing options...
chrysler1941 Posted September 18, 2021 Report Share Posted September 18, 2021 13 hours ago, Mertz said: Do I need to soften a new gasket? A new hasn't been hardened by squishing so no. Quote Link to comment Share on other sites More sharing options...
billrigsby Posted October 3, 2021 Report Share Posted October 3, 2021 On 9/15/2021 at 3:57 PM, greg g said: Look closely at the head topside. There should be a pipe plug screwed into the hole. This gives access for a tool to ascertain TDC for cylinder six. Since 1 and 6 travel together, when 6 is at TDC, so is one. This allows you to set static timing when you determine 1 is oncompression. ( 6 IS TDC exhaust) ypo can also insert a long wire to measure an unknown blocks stroke. What is the proper fitting for the 'timing hole' It is referenced several times in the parts book under 143-932, but no real good description. Getting ready to paint the engine, want the plug in and correct before paint. Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted October 3, 2021 Report Share Posted October 3, 2021 1/8” NPT pipe plug Quote Link to comment Share on other sites More sharing options...
billrigsby Posted October 3, 2021 Report Share Posted October 3, 2021 38 minutes ago, Merle Coggins said: 1/8” NPT pipe plug Thanks, that is what I thought, external, square or hex head? Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted October 3, 2021 Report Share Posted October 3, 2021 I think the originals are hex head. Quote Link to comment Share on other sites More sharing options...
Mertz Posted October 4, 2021 Author Report Share Posted October 4, 2021 Mine is a regular hex head. Quote Link to comment Share on other sites More sharing options...
chrysler1941 Posted October 4, 2021 Report Share Posted October 4, 2021 Looked up timing plug part # for comparison. Looks like they changed it from earlier 127950 to later 143932. Anyway yours should be square according to Standard Parts List Quote Link to comment Share on other sites More sharing options...
billrigsby Posted October 4, 2021 Report Share Posted October 4, 2021 Well, how right you are, not sure why, when I searched the parts manual, it skipped right over that page? Every other usage of the part number kept popping up, just tried again, skips right over that page. Thanks. Quote Link to comment Share on other sites More sharing options...
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