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#1
06-11-2021, 09:53 AM
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Bolts versus Studs
At what point do bolts versus studs become necessary? I have taken some recently acquired aluminum heads to the shop to be resurfaced, and because of some imperfections may require a deck surface removal of 0.020 to cleanup, which got me to thinking whether aluminum or iron, at what point of deck surface removal do bolts become obsolete and studs become necessary for proper clamping forced?
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#2
06-11-2021, 10:28 AM
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The choice of going over to studs has nothing to do with the deck surface condition, it's all about maintaining clamping force on the head gasket with very high hp cylinder pressures and secondarily to ease distortion of the cylinder Bore.
You will be fine with bolts that are in good condition even if your making up to 600 hp.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
06-11-2021, 11:13 AM
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Quote:
The OEM bolts and aftermarket fasteners may not take this into consideration and therefore you may be using a bolt that is too long, negating any recommended torque value and clamping force. |
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#4
06-11-2021, 11:31 AM
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In days gone by builders of motors to be run the in NHRA stock and super stock classes seaking the highest compression they could within the rules would mill / deck the tops of the blocks that had factory valve notches .100" or more to remove the notches and still since there where no studs available at the time run bolts with no issue whatsoever!
This would often be done in conjunction with milling the heads .060". Cuts like your talking about required no change over to studs weather you talking about cutting a iron or Aluminum head. As a side note looking back , I do not think that decking these race blocks to gain like a 1/4 point of compression was worth the loss of air flow between.200" to .300"!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 06-11-2021 at 11:39 AM. |
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#5
06-11-2021, 07:21 PM
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Quote:
http://www.sdperformance.com/moreTech.php?newsID=41 |
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