1/2".
The 351W motors featured 1/2″ head bolts, unlike the smaller 7/16″ bolts found on factory 79-95 302 5.0L motors.
Do 351W head bolts need sealant?
On a 351W the top bolts need the oil but the bottom bolts enter the water jacket which requires a sealant, PERHAPS, I have seen both open and blind tapped on 351W, ARP makes a good sealant…
Can you reuse Ford head bolts?
A head bolt should not be reused if the threads are galled or badly damaged. Chasing damaged head bolt threads with a die will clean up the threads but also remove material (metal) and undermine the head bolt’s ability to torque down and hold to specs.
What size are Ford 302 head bolts?
Specs
| Manufacturer | Edelbrock |
|---|---|
| Quantity | Kit |
| Thread Type | Coarse |
| Thread Diameter | 0.4375 in |
| Minimum Length | 3.50 in |
Can you reuse factory head bolts?
Bolts are designed to stretch as you torque them into place, and when you remove them, they snap back to their original position. Because of this, many standard head bolts are okay to use more than once, as long as they have not been stretched past their spring back point.
What happens if you dont torque head bolts?
What happens if head bolts or studs aren’t tight enough? There’s a lot of cylinder pressure in your engine while it’s running and if the heads aren’t sealed to the block this pressure will find a way out, typically into your coolant channels. Conversely coolant can also enter your combustion chamber.
What happens if you use old head bolts?
One of the largest issues with reusing old head bolts that are past their prime is the risk it creates for your gasket. If a head bolt breaks or fails to maintain torque, you can blow the head gasket, which in turn leads to a whole host of other issues for your engine—and an expensive repair.
How many times can a torque to yield bolt be reused?
What is a torque-to-yield bolt? It is a one-time-use fastener that is designed to stretch during the torquing process (installation). Because of this stretching, the integrity of the bolt is compromised. These bolts cannot and should not be reused due to the stress caused to the bolt during its first installation.
How many times can you use head bolts?
Head studs clamping force is spread throughout the axis of the stud because it’s the nut that’s twisted onto the shaft instead of the entire bolt being twisted into the engine block. That exact reason is also why you can reuse head studs three-four times without having to purchase brand new ones.
What size head is a m10?
Metric Hex Bolt Dimensions
| NOMINAL SIZE (D) | BODY DIAMETER | HEAD THICKNESS |
|---|---|---|
| m10 | 10.00 | 6.17 |
| m12 | 12.00 | 4.24 |
| m14 | 14.00 | 8.51 |
| m16 | 16.00 | 9.68 |
What size are the bolt heads?
Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt.
| US Bolts | ||
|---|---|---|
| Bolt Diameter (in) | Head and Wrench Size (in) | |
| 5/8 | 15/16 | 1 1/16 |
| 3/4 | 1 1/8 | 1 1/4 |
| 7/8 | 1 5/16 | 1 7/16 |
What do 6 lines on a bolt head mean?
SAE grade 8 fastener
Three radial lines will indicate an SAE grade 5 fastener, while six radial lines will indicate an SAE grade 8 fastener. These are the most common grades, but there are others.
Which bolts Cannot be reused?
Galvanized bolts and F3125 Grade A490 bolts that have been pretensioned may not be reused at all.
Should I lube my head bolts?
Be sure you also lube the underside of the bolt head as well as the threads.
What happens if you reuse torque to yield head bolts?
Torque-to-yield (TTY) head bolts are designed to stretch when used. Once stretched, they are not as strong as before. Consequently, they cannot provide the same amount of clamping force and may break or shear off if reused.
How do you tell if a bolt is over torqued?
Yielding fasteners are typically brought about by too much torque. An externally threaded fastener which has been over-torqued will generally stretch and “neck down” causing an hourglass shape as pictured below. If your fastener looks like this, it has been over tightened.
What sealant to use on head bolts?
Loctite Headbolt & Water Jacket Sealant is a single-component anaerobic hybrid that lubricates fasteners during assembly, as well as seals the gaps between the threads. It eliminates corrosion, which can cause difficulties if future disassembly is required.
How many times can you reuse a bolt?
Previous modifications made to fasteners with paint, lubrication, or other treatments also make them unsuitable for a second application. Used bolts, nuts, washers, and other types of fasteners should not be reused on critical joints or applications, no matter their condition.
What is a bolt with no head called?
Threaded Rod. A threaded rod is threaded with no head, available in many grades and materials. Often referred to as redi-rod, fully threaded rod and ATR, threaded rod is used for fastening anything from an anchor bolt, to suspending electrical or plumbing equipment from a ceiling.
What happens if you reuse stretch bolts?
However, because the tightening procedure does permanently stretch the bolt, there is some risk of breakage if the bolt is reused. And since there is no way to tell how many times a bolt has been reused, it doesn’t make any sense to reused TTY bolts – the risk far outweighs the replacement cost of used bolts.
What happens if you torque a bolt too much?
Typically, an under torqued bolt will deform and be unable to provide as much clamping force as needed. An over torqued bolt will break.