Full Floater Posted November 10 Share Posted November 10 (edited) I have a previously good running 866, that has dropped a valve seat. No engine damage. I realize that most parts are near obsolete for these now, but if there are any lingering upper gasket sets out there somewhere that can be had, I will give this particular engine another chance before it's pulled and parted out. Any current leads on 866 head and manifold gasket sets? Edited November 10 by Full Floater Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/ Share on other sites More sharing options...
Joey Mack Posted November 10 Share Posted November 10 all I can offer is part numbers. 126SB 181A,,,, and 126SB 182A.. gasket kits for that engine. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585321 Share on other sites More sharing options...
Full Floater Posted November 10 Author Share Posted November 10 1 hour ago, Joey Mack said: all I can offer is part numbers. 126SB 181A,,,, and 126SB 182A.. gasket kits for that engine. Wow, that's good information. Thank you. Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585324 Share on other sites More sharing options...
Joey Mack Posted November 10 Share Posted November 10 I highly recommend finding this book. It has a lot of part numbers. It is one of my go to books. Jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585325 Share on other sites More sharing options...
Joey Mack Posted November 10 Share Posted November 10 I will try to remember posting the head gasket number later when I get home. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585326 Share on other sites More sharing options...
h67st Posted November 10 Share Posted November 10 Here's a pdf copy of that KSA book. https://www.bigmacktrucks.com/assets/ksa_book.pdf 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585328 Share on other sites More sharing options...
Popular Post D-Day Posted November 10 Popular Post Share Posted November 10 John Chalmers 717-334-8709, Chalmers sales is in Cashtown PA I got a complete engine gasket set from him 2 years ago he has some other parts as well 5 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585342 Share on other sites More sharing options...
Popular Post fjh Posted November 11 Popular Post Share Posted November 11 PAI has oversized seats! 3 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585351 Share on other sites More sharing options...
Joey Mack Posted November 11 Share Posted November 11 Head gasket for ENDT (B) 865-866 is: 57GC 199 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585385 Share on other sites More sharing options...
Full Floater Posted Saturday at 04:20 PM Author Share Posted Saturday at 04:20 PM On 11/10/2025 at 4:54 PM, fjh said: PAI has oversized seats! Thank you! Is that the proper "fix" for them? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585609 Share on other sites More sharing options...
fjh Posted Saturday at 07:17 PM Share Posted Saturday at 07:17 PM 2 hours ago, Full Floater said: Thank you! Is that the proper "fix" for them? yup 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585616 Share on other sites More sharing options...
Popular Post CF-Firefighter Posted Saturday at 08:34 PM Popular Post Share Posted Saturday at 08:34 PM I’m trying to learn more about the 865/866 myself. I have an 865 and am beginning to collect parts for future repairs. Thank you for the part numbers. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585617 Share on other sites More sharing options...
mowerman Posted Saturday at 09:32 PM Share Posted Saturday at 09:32 PM i thought i saw watts recently offering complete engine overall kits for those was very recent,,,i thought i remembered somewhere around $8,000 good luck,,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585623 Share on other sites More sharing options...
Full Floater Posted Sunday at 12:38 AM Author Share Posted Sunday at 12:38 AM 3 hours ago, mowerman said: i thought i saw watts recently offering complete engine overall kits for those was very recent,,,i thought i remembered somewhere around $8,000 good luck,,,bob I believe those are E9 kits. Seems like a good price however, for an E9 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585632 Share on other sites More sharing options...
Full Floater Posted Sunday at 12:40 AM Author Share Posted Sunday at 12:40 AM 4 hours ago, CF-Firefighter said: I’m trying to learn more about the 865/866 myself. I have an 865 and am beginning to collect parts for future repairs. Thank you for the part numbers. Me too. I understand that they were not the BEST platform out there, but if we have some good running ones, i'd like to keep them that way and use them within their limitations, reliably....for as long as we can 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585633 Share on other sites More sharing options...
terry Posted Sunday at 05:09 PM Share Posted Sunday at 05:09 PM 21 hours ago, fjh said: yup And throw them in the freezer before installing them? terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585664 Share on other sites More sharing options...
Popular Post Vladislav Posted Sunday at 06:06 PM Popular Post Share Posted Sunday at 06:06 PM 51 minutes ago, terry said: And throw them in the freezer before installing them? terry Valve seat? That's not a valve guide. As I was told in a local shop they use liquid nitrogen for cooling seats. And although valve guides, surface grinding and many other jobs are made by guys the seat installation is done by the chief himself. 4 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585667 Share on other sites More sharing options...
fjh Posted yesterday at 01:56 PM Share Posted yesterday at 01:56 PM This was a fairly common issue with the 865/66 Back in the day ! Head gaskets and broken head bolts also! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585690 Share on other sites More sharing options...
Full Floater Posted 8 hours ago Author Share Posted 8 hours ago On 11/17/2025 at 5:56 AM, fjh said: This was a fairly common issue with the 865/66 Back in the day ! Head gaskets and broken head bolts also! What are the thoughts on re-using the heads bolts on these? Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585734 Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago 1 hour ago, Full Floater said: What are the thoughts on re-using the heads bolts on these? re use! Same as the e9 these tended to break on the bottom outside corners! We would mark these on removal and replace or use inner on the the outer! If I remember right they are fine thread! My opinion! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585736 Share on other sites More sharing options...
Full Floater Posted 7 hours ago Author Share Posted 7 hours ago 17 minutes ago, fjh said: re use! Same as the e9 these tended to break on the bottom outside corners! We would mark these on removal and replace or use inner on the the outer! If I remember right they are fine thread! My opinion! Excellent. That makes the project more realistic, as I'm sure the bolts are getting hard to source also, AND likely quite pricey! Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585737 Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago Just now, Full Floater said: Excellent. That makes the project more realistic, as I'm sure the bolts are getting hard to source also, AND likely quite pricey! my self I would try to replace the 4 bottom corner ones! Just because! of the experience's! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585738 Share on other sites More sharing options...
Popular Post h67st Posted 5 hours ago Popular Post Share Posted 5 hours ago On 11/10/2025 at 7:54 PM, fjh said: PAI has oversized seats! I've seen some truck drivers that needed oversized seats. 😉 3 Quote Link to comment https://www.bigmacktrucks.com/topic/76116-866-v8-gasket-set-locating/#findComment-585740 Share on other sites More sharing options...
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