beatngu Posted July 22, 2016 Share Posted July 22, 2016 Well the heads have been shipped out for cleaning and a pressure check it looks like the rear head was warped from the buildup of black funk on the gasket. I don't know if it would be sure to reuse the old baskets so the idea is to have new ones cut out of copper. What would the proper thickness be for the gasket? Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/ Share on other sites More sharing options...
beatngu Posted July 24, 2016 Author Share Posted July 24, 2016 here is some pics of the heads removed and the gaskets Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340245 Share on other sites More sharing options...
theakerstwo Posted July 24, 2016 Share Posted July 24, 2016 Are you telling us there is no gaskets to be found for this engine? Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340264 Share on other sites More sharing options...
beatngu Posted July 25, 2016 Author Share Posted July 25, 2016 I am uncertain if I found the correct ones, there is no image to compare the two. I suppose I could buy one and hope for the best. Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340277 Share on other sites More sharing options...
mrgumby Posted July 25, 2016 Share Posted July 25, 2016 try these guys http://www.jobbersinc.com/mack.htm Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340279 Share on other sites More sharing options...
beatngu Posted July 25, 2016 Author Share Posted July 25, 2016 Cool I will give them a jingle tomorrow. The next battle is finding head studs, yaaay! Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340281 Share on other sites More sharing options...
Mike Posted July 25, 2016 Share Posted July 25, 2016 Those heads look pretty good. Mine have cracks but machine shop said if i'm going to baby it may last a long time. Sometimes the machine shop can help on gaskets. Watts or Olson Gaskets can also help. Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340288 Share on other sites More sharing options...
ranchhopper Posted July 25, 2016 Share Posted July 25, 2016 I just scrapped a 237 block I wish I would have known it had all the studs still in it. Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340294 Share on other sites More sharing options...
Freightrain Posted July 25, 2016 Share Posted July 25, 2016 When I popped a stud a few years ago, I bought 3-4 of them from Stanton Mack. Not sure how many are floating around anymore? I was going to check ARP to see if they had anything I could use, but didn't need to. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340348 Share on other sites More sharing options...
beatngu Posted July 25, 2016 Author Share Posted July 25, 2016 I called jobbers, they have the whole kit and kaboodle. I will be passing on studs but gaskets are a must. Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340388 Share on other sites More sharing options...
mrgumby Posted July 25, 2016 Share Posted July 25, 2016 thats good news Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340407 Share on other sites More sharing options...
Freightrain Posted July 26, 2016 Share Posted July 26, 2016 It doesn't hurt to have at least a COUPLE studs/nuts laying around. Mine lasted quite a while, then in a couple years popped two studs. Nothing tragic to replace, just weld a nut to the stud and unscrew it, but might save you some headaches later if it happens. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340501 Share on other sites More sharing options...
beatngu Posted July 26, 2016 Author Share Posted July 26, 2016 Got a call back from the motor shop he planed the one head and they pressure checked OK. Valve guides are a little sloppy but don't want to make that 200 dollar job into $500. He wanted to narrow them or something of that sort Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340512 Share on other sites More sharing options...
66dc75 Posted July 26, 2016 Share Posted July 26, 2016 knurl them? Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340514 Share on other sites More sharing options...
theakerstwo Posted July 27, 2016 Share Posted July 27, 2016 If he knurls the guilds they will last for a short time which is ok for a toy truck. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340538 Share on other sites More sharing options...
39 Baby Mack Posted July 27, 2016 Share Posted July 27, 2016 Glenn might have an opinion on this too. Looks to me like one head was replaced in the past. Both heads are 18 stud heads, but one looks like it has the larger holes for the 3/4" corner studs. The studs are 9/16", with special washers to adapt the later head with the large holes to 9/16 studs. Also Glenn, if memory serves me, wasn't there plugs made to seal off the corner water passages in the block and head? Ron Sent from my SM-G900V using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340542 Share on other sites More sharing options...
theakerstwo Posted July 27, 2016 Share Posted July 27, 2016 I can not remenber that but may be true. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340590 Share on other sites More sharing options...
beatngu Posted July 27, 2016 Author Share Posted July 27, 2016 I didn't even take notice to those plugs before, interesting. I am debating keeping the heads off until i can find some new guides and Send them back another time to be safe. I doubt I will put a dogpile of miles on it or work it for that matter Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340634 Share on other sites More sharing options...
Freightrain Posted July 28, 2016 Share Posted July 28, 2016 I know back the first time I put valve cover gaskets on my 673 (about 2002), I grabbed a valve and gave it a wiggle. I just closed my eyes and glued the covers back on LOL!! See ran for another 14 yrs without issue. Mostly flat on the governor at 2100 rpm. Presently it is sitting next to the garage waiting to find a new owner. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-340709 Share on other sites More sharing options...
beatngu Posted August 14, 2016 Author Share Posted August 14, 2016 Got the heads back, he planed 5 thousandth off both pressure checked and cleaned plus 2 new frost plugs. The left head does have 5/8 corner stud holes... don't know if that is an issue or not. Those plugs in the head were actually reducers of some sort maybe that is why it was running 80 pounds of oil pressure? Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-342333 Share on other sites More sharing options...
39 Baby Mack Posted September 28, 2016 Share Posted September 28, 2016 Do you have the special washers that go into the 3/4" corner stud holes for the 9/16" studs? Sent from my SM-G900V using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-347094 Share on other sites More sharing options...
Mike Posted September 29, 2016 Share Posted September 29, 2016 I got talked into having the valve guides knurled in my 77 Ford 302 engine. It was a mistake i'll never do again. I would not do it to any engine cause it is just borrowing time. I did not do it with my 673. Dad used to say (if it is worth having then it is worth doing it right). Quote Link to comment https://www.bigmacktrucks.com/topic/46171-end673-heads/#findComment-347249 Share on other sites More sharing options...
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