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not sure what ur saying here , but raise the rpm on one of the pipeline engines and see how hot it would get before it broke forever !!
hi perf. engines will run hotter than stock engines...
^^^^^bullshit , i ran a lot of 115/145 in a stock 68 form. S 383 fastback back when , turned the tailpies blue , no other noticble diff...really couldn`t tell any perf. diff either...
boy something don't look right , Dont remember either of mine having a bolt hole under the manifold !
You sure you have parts matched right ? We are talking about a 426 hemi aren't we ? Manifolds look wrong / best I can remember , show a pi of the whole manifold >>..
I used to work on 8,12 and 16 cyl pipeline engines , they were not hi rpm (performance) engines , built to run yrs and yrs at 350ish rpm according to the type and manufacturer .
Hot hi perf. engines require more cooling that even stock hi performance engines , at least all of mine have !!
wondering which heads you have , maybe a factory head that was configured for headers ----??????
I`d put a sealer an it and use a bolt that wont quite touch the head bolt and fugetaboutit .
scusem Waugh , I thot you were talking about inside the head .
I wouldn't worry about that f it doesn't go thru to the water jacket , or such...
assuming you have the right manifolds on it , been too long since I had my hemis ?????/
I didn't read all these posts , clearly most of you don't know or realize what farmers have to do .
around a 1000 acres and 397 head of cattle ,machinery, horses ,milk cows, and even a few hogs ,and 500 white leghorn chickens a couple of diff times >all back when I was a kid , there was always...
had M S D on 4 diff. hotrods , never had a problem with any of them , think MSD even says you can open up the plug gap some ...or used to , hotter spark will jump a wider gap..