Studs or Bolts?

Fastpitchdad · February 23rd, 2007, 05:42 PM

which is better? head studs or head bolts?

WAR-PARTY · March 1st, 2007, 11:01 AM

Spend the money and get ARP head studs, there are many reasons. best of all you can re-use them if you have to change head gaskets.....

Darrell · March 1st, 2007, 11:09 AM

HEAD STUDS vs. BOLTS...
A TECHNICAL DISCUSSION from ARP

ARP’s factory Tech Representatives are often asked which
is better, cylinder head studs or bolts. The answer, invariably,
depends on the installation. On many street-driven vehicles,
where master cylinders and other items protrude into the engine
compartment, it’s probably necessary to use head bolts so that
the cylinder heads can be removed with the engine in the car.
For most applications, however, studs are recommended.
And for good reason. Using studs will make it much easier to
assemble an engine (especially a racing powerplant which must
be serviced frequently and quickly!) with the cylinder head and
gasket assured of proper alignment.
Studs also provide more accurate and consistent torque
loading. Here’s why. When you use bolts to secure the head,
the fastener is actually being “twisted” while it’s being torqued
to the proper reading. Accordingly, the bolt is reacting to two
different forces simultaneously. A stud should be installed in
a “relaxed” mode – never crank it in tightly using a jammed
nut.
If everything is right, the stud should be installed finger
tight. Then, when applying torque to the nut, the stud will
stretch only on the vertical axis. Remember, an undercut
shorter stud will have a rate similar to a longer, standard shank
stud. This provides a more even clamping force on the head.
Because the head gasket will compress upon initial torquing,
make sure studs and bolts are re-torqued after the engine has
been run.

Fastpitchdad · March 1st, 2007, 07:07 PM

Thanks darrell and war party..

studs it is

February 23rd, 2007, 05:42 PM	#1
Fastpitchdad Regular Join Date: Aug 2006 Posts: 131	Studs or Bolts? which is better? head studs or head bolts?

March 1st, 2007, 11:01 AM	#2
WAR-PARTY Hardcore Enthusiast 2001 YUGO GT Join Date: Aug 2006 Location: GOAT LOCKER PENSACOLA FL Posts: 1,068	Spend the money and get ARP head studs, there are many reasons. best of all you can re-use them if you have to change head gaskets..... __________________ Military Crew Golden Shellback U.S. Navy ret. Been around the world 17 times, seen everything from a Cat fornicating contest to an elephant jack off. When Jesus has a question God tells him 'Go ask the Chief.'

March 1st, 2007, 11:09 AM	#3
Darrell MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 6,449	HEAD STUDS vs. BOLTS... A TECHNICAL DISCUSSION from ARP ARP’s factory Tech Representatives are often asked which is better, cylinder head studs or bolts. The answer, invariably, depends on the installation. On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, it’s probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car. For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing powerplant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment. Studs also provide more accurate and consistent torque loading. Here’s why. When you use bolts to secure the head, the fastener is actually being “twisted” while it’s being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a “relaxed” mode – never crank it in tightly using a jammed nut. If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket will compress upon initial torquing, make sure studs and bolts are re-torqued after the engine has been run. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

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March 1st, 2007, 07:07 PM	#4
Fastpitchdad Regular Join Date: Aug 2006 Posts: 131	Thanks darrell and war party.. studs it is

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