Re: Adding extra 3/8 head bolts/studs on a 401 block INFO needed

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

" From: "Bob" <masheen@xxxxxxx>
"
" []
" And yet another thought:  Should you go with a 16 or 24 thread?
" Not sure which is stronger, but since the other head bolts are a
" course thread, maybe 3/8-16 is the better way to go.

fine is usually stronger, but i agree - if the others are coarse,
stick with it.
THE REASON THE OTHERS ARE COARSE IS FROM MACHINE SHOP 101.......
CAST IRON DOES NOT HOLD BOLTS WELL WHEN THEY ARE FINE THREADED.
FINE THREADS IN CAST IRON WILL SHEAR OFF MORE READILY WHEN A BOLT
IS TURNED INTO THEM. COARSE THREADS DISTRIBUTE THE LOAD BETTER IN BOTH
CAST IRON AND ALUMINUM TOO. STEEL WORKS GREAT WHEN FINE THREADS ARE USED.
CHECK  A CAST BLOCK OR HEAD SOMETIME, YOU'LL NOTICE EVERY BOLT HOLE IS
COARSE THREAD.
SAME WITH ALUMINUM CASTINGS. THE BEST WAY TO BUILD CAST BLOCK BASED ENGINES
IS WITH STUDS, BECAUSE THE TIGHTENING FORCES CAN BE TRANSFERRED TO THE FINE
THREAD ON THE STUD. MOST ALL VERY HIGH PERFORMANCE ENGINES UTILIZE STUD
FASTENERS.

" I'd also like to know what the bolt spacing is and if the specs we
" are talking about are applicable to all the V8's.
I'D LIKE TO KNOW WHERE TO FIND ANY REFERENCE TO ADDING ADDITIONAL HEAD BOLTS
ON AMC ENGINES, I HAVEN'T SEEN ANYTHING REFERING TO THIS PROCEDURE?????

i don't see why not.  they're all basically the same, and if anything
it should be easier on the smaller bores.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none thought