Re: Head Bolts

Posted by The tractor vet on December 21, 2019 at 08:30:49 from (104.179.81.68):

In Reply to: Re: Head Bolts posted by showcrop on December 21, 2019 at 04:23:39:

Well many years ago i put together many higher then stock compression engines and we used FACTORY HEAD bolts and ya how what they all stayed together . My 390 i hand built from new and when i say new was a NEW BLOCK bare new heads bare and new main bolts head bolts , as a matter of fact all bolts were factory new . And the pistons with the heads used came up with 13.5 to 1 compression ratio on steel shim head gskt. This engine ran seven days a week and three days a week if i was not working was getting the bag run off it on the drag strip for two and half years . The last big power engine i put together for myself was a 385 block Ford that i never did the math on compression ratio but i can tell you this i could not personally hold a compression gauge into the spark plug hole So i had a buddy who was way stronger then i TRY and hold it and on the first compression stroke it shoved him off the step stool and pegged the gauge a 300 PSI and ya know what we used stock 460 Ford head bolts on that one and ran that engine for five years and no problems holding the head on . Sure you can spend big money and get your ARP studs and feel all warm and fuzzy inside . The old engines did use studs on some makes and the ones that did you learned to hate when you had to pull the head and start the clean up fighting your way around each stud . More labor involved when ya have to do machine work on the block , the fun of getting all the studs out of the block , the extra room required for pulling a head over top the studs . And on and old A/C G engine ya could darn near get away with grade two all thread , But a good quality grade 8 would be fine . And un plated Just a plain old Black finish bolt , Now if they used a heavy flat you may run into a problem finding one close to what they came with . Even if your pushing one horse power to one cubic inch myself i would not worry about it . Only engine i had some what a problem with was my Small cam 855 Cummins and on that one i could count on a head gskt failure and stretched head bolt around 50-60000 miles as i may have had the wick turned up a wee bit to much along with the 68 PSI boost the VT 1710 injection pump build . And the fact that we hauled vary heavy . Back then the object of the game was to run fast haul heavy and look light , so you had to be able to plum smoke a freight box on the hill while having more NET in the wagon then they had Gross.

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