87-92 Supra Turbo ARP Head Bolts and Head Studs
The 7MGTE is notorious for blowing head gaskets. 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 head gasket 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. ARP recommends 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 head gasket.
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.
ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Each stud is placed vertically in special racks and precisely heat-treated to 190,000 psi, ensuring complete heat penetration.Following heat-treat, each 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.
ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned. ARP 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). It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort. Premium quality parallel ground washers are also included with each kit. ARP head studs are a must for performance engines seeing increased boost, and they are truly the best on the market for your Supra.
- FITMENT:
- Toyota Supra 1987-1992 Turbo ONLY
| Description | Part # | MSRP | Price | Inventory | |
|---|---|---|---|---|---|
| 7MGTE Head Studs | 203-4202 | $215.00 | $128.00 | 7 available |
ARP Pro Series Head Bolts for the Supra 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. ARP Mini Cooper fasteners deliver superior strength and meet the ARP ZERO defect ZERO failure quality standard. Hardened and parallel-ground washers are included with each kit to ensure even load distribution and accurate torque readings. All Pro Series head bolts have a reduced wrenching 12-point head and wide area flange to eliminate the need for valve train removal for cylinder head retorquing and permits the use of larger diameter valve springs.
- FITMENT:
- Toyota Supra 1987-1992 Turbo ONLY
| Description | Part # | MSRP | Price | Inventory | |
|---|---|---|---|---|---|
| 7MGTE Head Bolts | 203-3902 | $171.00 | $102.00 | 3 available |
