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Grade 8 Bolts for Head Bolts

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  #21  
Old 07-25-2018, 08:32 AM
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Originally Posted by ArmyRover
Actually they are based on the buick 215 V8 which it shares parts with and was a all aluminium engine.
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.
 
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  #22  
Old 07-25-2018, 10:41 AM
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Originally Posted by robertf
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
Robert, thank you. This is the kind of stuff I was looking for. I hope you can understand my push back. I've been told "it won't work, don't try" on a lot of stuff that, frankly, works awesome.

I appreciate you taking the time to crunch the numbers. This gives me much better insight.
 
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  #23  
Old 07-25-2018, 10:42 AM
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Originally Posted by Sixpack577
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.
Same block, same heads. The block has been bored, but it's still the same. Bosch engine is the only one that didn't have a distributor also.
 
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  #24  
Old 07-25-2018, 10:44 AM
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Yep, the original Buick engine was aluminum. 63 Skylark had the engine.
 
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  #25  
Old 07-25-2018, 12:09 PM
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Originally Posted by Sixpack577
Are you sure the Buick 215 was aluminum heads and block??
Yes it was.

Cam, lifters timing chains etc
 
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  #26  
Old 07-25-2018, 12:30 PM
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Originally Posted by ArmyRover
Yes it was.

Cam, lifters timing chains etc
Cam is not the same.
Specs are different, and the Buick cam has a gear drive on it.
 
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  #27  
Old 07-25-2018, 12:32 PM
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Originally Posted by Alex_M
Same block, same heads. The block has been bored, but it's still the same. Bosch engine is the only one that didn't have a distributor also.
If the stroke is the same, then it has been bored alot, 71 cubic inches.
 
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  #28  
Old 07-25-2018, 12:33 PM
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Didn't the Buick also have rockers arms, not rocker shafts?
 
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  #29  
Old 07-25-2018, 12:57 PM
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96-99 GEMS 4.0/4.6L in the D1/P38 wasn’t using a distributor either.
 
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  #30  
Old 07-25-2018, 02:11 PM
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Originally Posted by Sixpack577
Cam is not the same.
Specs are different, and the Buick cam has a gear drive on it.
My Rover cam has a gear drive to.

This is the cam in my truck
 
Attached Thumbnails Grade 8 Bolts for Head Bolts-screenshot_20180725-150924.png  
Last edited by ArmyRover; 07-25-2018 at 02:13 PM.
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