Grade 8 Bolts for Head Bolts
#21
Are you sure the Buick 215 was aluminum heads and block??
What parts does it share? Heads are different, displacement is different, intake different, it had a distributor, which drove an oil pump, so front cover is different.
#22
I just did some real quick and dirty calcs using advertised torque to get cylinder pressure, average pedestal length at a 1.8, assuming grade 8 proof load of 120ksi, ambient to engine temp delta of 120F, and .2 for bolt torque force equation. 1 bolt out of spec and it'll fail for sure.
DISPLACEMENT # BOLTS FASTENER FT-LBS ENGINE FT-LBS CLAMPING FORCE FASTENER SAFETY FACTOR
3.5 14 55 210 115500 1.2
3.9 14 55 250 115500 1.19
4.6 14 55 300 115500 1.18
3.5 10 65 210 97500 1.06
3.9 10 65 250 97500 1.05
4.6 10 65 300 97500 1.04
DISPLACEMENT # BOLTS FASTENER FT-LBS ENGINE FT-LBS CLAMPING FORCE FASTENER SAFETY FACTOR
3.5 14 55 210 115500 1.2
3.9 14 55 250 115500 1.19
4.6 14 55 300 115500 1.18
3.5 10 65 210 97500 1.06
3.9 10 65 250 97500 1.05
4.6 10 65 300 97500 1.04
I appreciate you taking the time to crunch the numbers. This gives me much better insight.
#23
I knew it was "based" on that old design, but did not know it was all aluminum.
Are you sure the Buick 215 was aluminum heads and block??
What parts does it share? Heads are different, displacement is different, intake different, it had a distributor, which drove an oil pump, so front cover is different.
Are you sure the Buick 215 was aluminum heads and block??
What parts does it share? Heads are different, displacement is different, intake different, it had a distributor, which drove an oil pump, so front cover is different.
#24
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Sixpack577 (07-25-2018)
#25
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Sixpack577 (07-25-2018)
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