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| ARP Head Bolts & Head Studs for 87-92 Supra Turbo 7MGTE |
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Head Bolts: ARP Pro Series Head Bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and are rated nominally at 190,000 psi. ARP Pro Series head bolt kits are application specific designed for use with typically competition only components. These fasteners deliver superior strength and meet the ARP ZERO defect ZERO failure quality standard. |
| Hardened and parallel-ground washers are included with ARP head bolt kit to ensure even load distribution and accurate torque readings. All ARP Pro Series head bolts have a reduced wrenching 12-point head and wide area flange to eliminate the need for valvetrain removal for cylinder head retorquing and permits the use of larger diameter valve springs. ARP head-bolts are a cost-effective solution for your 7MGTE. |
| Head Studs: ARP® uses a premium grade 8740 alloy rated far superior to “aircraft” quality for their head studs. This alloy is heat-treated to 190,000 psi for complete heat penetration. Following heat-treat, each head stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. Because ARP® head studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned—something that won’t happen with inferior quality head studs. ARP® head studs are thread rolled after heat-treat, which gives them about 1000% (that’s ten times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). ARP head studs are the ultimate solution for your 7MGTE.
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Head Bolts Vs. Head Studs
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, head studs are recommended. Head 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.
ARP head 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 head stud should be installed in a
relaxed mode—never crank it in tightly using a jammed nut. The stud should be installed finger tight then, when applying torque to the nut, the stud will stretch
only on the vertical axis. Because the
head gasket will compress upon initial torquing, make sure
studs and bolts are re-torqued after the engine has been run.
Head Bolts, Head Studs, and the 7MGTE: The 7MGTE is notorious for blowing headgaskets. The cause for this is inferior quality OEM cylinder head bolts. The factory Toyota bolts do not provide enough clamping force to keep the cylinder head tightly clamped against the block so, over time, the bolts stretch and the headgasket blows out. ARP head bolts are a good solution for street cars running normal boost levels, as they are manufactured to a higher tolerance and can be torque to a higher value than stock head bolts. JSC Speed and ARP both reccomend head studs for higher-boost 7MGTEs, however, because they provide a more effective clamp on the cylinder head and will allow you to perfectly situate the headgasket; the downside is that they are harder to install with the engine in the car (because you have to lift the cylinder head over the studs and lower it).
Shipping costs are calculated upon checkout
NOTE: ARP head bolts and ARP head studs provide the same function, so you only need to purchase one or the other.
FITMENT: 1987-92 Toyota Supra Turbo, 7MGTE Engine. |
| Description |
Part #: |
MSRP: |
Price: |
Inventory |
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| ARP 7MGTE Head Bolts |
arp203-3902 | $123 | $94 | 4 in stock | |
| ARP 7MGTE Head Studs |
arp203-4202 | $155 | $118 | Usually ships next day | |
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