SPECIFICATIONS DESCRIPTION SHIPPING & RETURN FAQS REVIEWS
EVIL ENERGY Cylinder Head Bolt Kit - Complete Set with Free Shipping + 180 - Day Return
EVIL ENERGY Cylinder Head Bolt Kit Product Dimensions - 106mm, 88mm, 55mm Bolts & Washer Specs
EVIL ENERGY Cylinder Head Bolt Kit Components - Black Head Bolts & Washer Close - up
EVIL ENERGY Cylinder Head Bolt - One - Piece Design for Streamlined Installation & Optimized Performance
EVIL ENERGY Cylinder Head Bolt Kit Material - 42CrMo Alloy Steel for Superior Performance & Durability
EVIL ENERGY Cylinder Head Bolt Kit Leak - Free Upgrade - 210K PSI Tensile/Yield Strength vs Others
EVIL ENERGY Cylinder Head Bolt Kit Vehicle Fitment - Chevrolet Small Block Compatibility
EVIL ENERGY Cylinder Head Bolt Kit - High Strength & DIY - Friendly, Superior Performance & Durability

EVIL ENERGY 42CrMo Cylinder Head Bolt Kit 210K PSI Compatible with 1955-2000 Chevy Small Block Gen I (265/283/302/305/307/327/350/400)

$74.99
$74.99
15%
Exclusive Limited
Expires in 01:00:00
Success copy!
Add To Wish List
SKU: EVENS162500000001
Product Type: Cylinder Head Stud
EVIL ENERGY Cylinder Head Bolt Kit - Complete Set with Free Shipping + 180 - Day Return

EVIL ENERGY 42CrMo Cylinder Head Bolt Kit 210K PSI Compatible with 1955-2000 Chevy Small Block Gen I (265/283/302/305/307/327/350/400)

$74.99
$74.99
EVIL ENERGY Cylinder Head Bolt Kit - Complete Set with Free Shipping + 180 - Day Return
EVIL ENERGY Cylinder Head Bolt Kit Product Dimensions - 106mm, 88mm, 55mm Bolts & Washer Specs
EVIL ENERGY Cylinder Head Bolt Kit Components - Black Head Bolts & Washer Close - up
EVIL ENERGY Cylinder Head Bolt - One - Piece Design for Streamlined Installation & Optimized Performance
EVIL ENERGY Cylinder Head Bolt Kit Material - 42CrMo Alloy Steel for Superior Performance & Durability
EVIL ENERGY Cylinder Head Bolt Kit Leak - Free Upgrade - 210K PSI Tensile/Yield Strength vs Others
EVIL ENERGY Cylinder Head Bolt Kit Vehicle Fitment - Chevrolet Small Block Compatibility
EVIL ENERGY Cylinder Head Bolt Kit - High Strength & DIY - Friendly, Superior Performance & Durability

EVIL ENERGY 42CrMo Cylinder Head Bolt Kit 210K PSI Compatible with 1955-2000 Chevy Small Block Gen I (265/283/302/305/307/327/350/400)

$74.99
SPECIFICATIONS

Type Head Bolt
Head Bolt1 Spec

Thread: 7/16 - 14 UNC;

Pitch: 14 TPI;

Diameter: 7/16 inch;

Length: 55 mm
Head Bolt 2 Spec

Thread: 7/16 - 14 UNC;

Pitch: 14 TPI;

Diameter: 7/16 inch;

Length: 88 mm
Head 3 Spec

Thread: 7/16 - 14 UNC;

Pitch: 14 TPI;

Diameter: 7/16 inch;

Length: 106 mm
Washer Size 20.7*11.2*3mm
Package Content

16×Head Bolt 1;

4×Head Bolt 2;

14×Head Bolt 3;

34×Washers ;

1×Lubricating Grease;

1×Neutral Instruction Manual
Material High-Strength 42CrMo Alloy Steel
Tensile Strength 210,000 PSI
Yield Strength 210,000 PSI
Fitment

Chevrolet Small Block

1955-1957 Chevy small block Gen I 4.3L/265

1957-1967 Chevy small block Gen I 4.6L/283

1962-1969 Chevy small block Gen I 5.4L/327

1967-1968 Chevy small block Gen I 4.9L/302

1967-2000 Chevy small block Gen I 5.7L/350

1968-1973 Chevy small block Gen I 5.0L/307 Stock configuration

1970-1980 Chevy small block Gen I 6.6L/400

1976-2000 Chevy small block Gen I 5.0L/305 Stock configuration

1979-1982 Chevy small block Gen I 4.4L/267 Stock configuration
Engine Fitment 265, 283, 302, 305, 307, 327, 350, 400

DESCRIPTION

EVIL ENERGY SBC Head Bolt Kit for Chevy 350 & Gen I Engines

Upgrade your engine's structural integrity with the EVIL ENERGY SBC Head Bolt Kit. This high-performance small block chevy head bolt kit is precision-engineered for Gen I engines, providing a superior alternative to standard Chevy 350 head bolts. Whether rebuilding a classic 305 Chevy or a high-horsepower 350 SBC, this SBC bolt kit ensures a professional-grade seal.

1. Precision SBC Head Bolt Thread Size & Fitment 

Our bolts feature the standard SBC head bolt thread size of 7/16 - 14 UNC. This SBC bolt kit includes all three necessary SBC head bolt sizes (55mm, 88mm, and 106mm) to accommodate the varied deck heights and casting requirements of small block Chevy head bolts.

2. 210K PSI Strength for 350 SBC Head Bolts 

While standard head bolts for 350 Chevy often feature 180K PSI, our Chevy 350 bolt kit is rated at 210,000 PSI tensile strength. This ensures that even under high compression, your SBC head bolts will not stretch, preventing head gasket failure in performance 350 Chevy head bolt applications.

3. Premium 42CrMo Alloy Construction

Durability is key for Chevy 350 head bolts. Made from 42CrMo high-strength alloy steel, these small block Chevy head bolts offer better heat resistance than OEM parts. It’s the ultimate SBC head bolt solution for 1955–2000 Chevy head identification and restoration projects.

EVIL ENERGY high-strength sbc head bolts for DIY engine rebuild, 210K PSI tensile strength cylinder head bolts for Chevy small block.

Why Choose EVIL ENERGY for Your Small Block Chevy Head Bolts?

  • 210K PSI Dual Strength for Extreme Reliability: Each EVIL ENERGY Head Bolt is rated at 210K PSI tensile & yield strength (surpasses common 180K PSI OEM bolts), offering unmatched clamping force. These Cylinder Head Bolts resist breakage and prevent cylinder head leaks in turbocharged, supercharged, racing, or heavy-duty Chevy Small Block applications.
  • 42CrMo Alloy Steel for Engine Durability: Built from premium 42CrMo alloy steel, the EVIL ENERGY Head Bolt Kit ensures the perfect balance of hardness, toughness, and heat resistance. Engineered to withstand extreme heat and fatigue in 1955–2000 Chevy 265/283/302/350/400 engines, these bolts significantly outlast standard steel fasteners.
  • Cost-Effective vs. Stud Kits: More affordable than head stud systems, the Chevy Head Bolt Kit provides premium strength without unnecessary expense. Perfect for OEM replacement or budget-friendly performance builds, while fitting all Chevy Small Block Gen I (4.3L–6.6L) engines with precision.
  • Easy Installation for DIY & Repairs: One-piece integrated Head Bolt design threads directly into the engine block, reducing installation steps compared to stud kits. This makes the EVIL ENERGY Cylinder Head Bolt Kit ideal for both professional mechanics and DIY enthusiasts, requiring no extra tools
  • Complete Ready-to-Use Kit: Includes 16×55mm + 4×88mm + 14×106mm Head bolts, 34×20.7×11.2×3mm washers, lubricating grease, and instruction manual—no extra parts required for immediate installation.
SBC head bolt kit vehicle fitment chart for Chevy small block Gen I 265, 283, 302, 305, 327, 350, and 400 engines from 1955-2000.

How to Measure SBC Head Bolt Size Correctly

Accurate measurement is the key to successful 350 SBC head bolts installation. Follow these steps to verify your hardware:

  1. Check Thread Pitch: Use a gauge to confirm the SBC head bolt thread size is 7/16 - 14 UNC.
  2. Measure Underhead Length (UHL): Use a digital caliper to measure from the underside of the bolt head to the tip of the threads. Do not include the bolt head height in your measurement.
  3. Identify the Three Lengths: Your sbc head bolt kit should contain three sizes: Short (55mm), Medium (88mm), and Long (106mm).
  4. Confirm Washer Fitment: Always use the included 3mm washers to ensure the head bolts for the 350 Chevy don't bottom out in the block.
42CrMo alloy steel sbc head bolt thread size details, 7/16-14 UNC pitch small block chevy head bolt close-up for engine durability.

Technical Installation & Torque Tips

For the best results with your small-block Chevy head bolts, follow the factory torque sequence:

  • Preparation: Clean all block threads with a 7/16-14 thread chaser to ensure the SBC head bolt thread size matches perfectly.
  • Lubrication: Apply the included grease to the threads and under the bolt head to achieve accurate torque for your Chevy 350 head bolts.
  • Sequence: Follow a three-step torque process in the standard small block Chevy criss-cross pattern to prevent cylinder head warping.

 

SHIPPING & RETURN

Brand Summary

Policy Details
Cancellation Policy Orders can be canceled within 48 hours of placement. Refund processed in 3-5 business days.
Returns Policy Returns accepted within 180 days. Full refund within 90 days; 15% fee for 90-180 days.
Non-Returnable Items Only regular-priced items are eligible for refunds; sale items are non-refundable.
Refund Processing If no refund received, check your bank/credit card. For ongoing issues, contact support@ievilenergy.com.

Return Reasons

  1. Quality Issues: Provide photos/videos; we cover return shipping.
  2. Wrong Item Ordered: Buyer covers return shipping; email within 30 days.
  3. Change of Mind: Buyer covers return shipping; email within 30 days.
  4. Shipping Damage: Inspect packages; do not sign for damaged items.
  5. Incorrect Item Shipped: Contact within 7 days.

Price Protection Policy

Effective from August 25, 2024. Price drops within 7 days of purchase can be claimed.

Disclaimer

EVIL ENERGY reserves the right to interpret, modify, or terminate this policy in accordance with applicable laws and regulations.

If you need further information or assistance, feel free to ask!

FAQS

Q: What size are SBC head bolts?
A: The standard SBC head bolt size for Gen I engines is a 7/16-inch diameter with a 14 UNC thread pitch. A complete SBC head bolt kit consists of three specific lengths to fit the varying casting depths: 1.75-inch (55mm), 3.00-inch (88mm), and 3.75-inch (106mm).

Q: What is the SBC head bolt thread size and pitch?
A: The precise SBC head bolt thread size is 7/16 - 14 UNC. Before installation, it is crucial to clean the engine block holes with a thread chaser. This ensures the small block Chevy head bolts reach the correct torque without binding due to debris or old sealant.

Q: Can you reuse head bolts on an SBC (Small Block Chevy)?
A: While Gen I Chevy 350 head bolts are not technically 'torque-to-yield' (TTY) like modern engines, reuse is discouraged. Over thousands of heat cycles, 350 SBC head bolts can stretch or fatigue. Installing a new EVIL ENERGY head bolt kit is cheap insurance against head gasket failure and costly engine damage.

Q: What size are the header bolts on a 350 Chevy?
A: Users often confuse head bolts with header bolts. While the SBC head bolt size is 7/16-inch, header bolts (for the exhaust manifold) are typically 3/8-inch - 16 x 3/4-inch or 1-inch. They are much smaller and not interchangeable with cylinder head fasteners.

Q: Are head studs better than head bolts for a 350 SBC?
A: For most street builds and OEM replacements, an SBC head bolt kit is superior because it allows for easier head removal while the engine is still in the vehicle bay. Head studs offer more precise clamping for high-boost racing but can make top-end maintenance difficult in tight spaces.

Q: What is the correct torque sequence for Chevy 350 head bolts?
A: To prevent cylinder head warping, small block Chevy head bolts must be torqued in a specific three-step sequence (usually 40, 55, then 65-70 ft-lbs). Always follow a criss-cross pattern starting from the center bolts and moving outward.

Q: Do SBC head bolts require thread sealant?
A: Yes. On most small-block Chevy blocks, the lower bolt holes transition into the water jackets. You must apply a high-quality sealant or the included lubricating grease to the Chevy 350 head bolts to prevent coolant from weeping up through the threads.

Q: How do I perform Chevy head identification for bolt compatibility?
A: Most Gen I SBC heads (1955–2000), including 'double hump' or Vortec heads, use the same SBC head bolt thread size (7/16-14). If your engine is a Gen I 265, 305, 327, 350, or 400, this SBC bolt kit is the standard fitment.

Q: Why is 210,000 PSI strength important for 350 SBC head bolts?
A: Standard Grade 8 350 head bolts usually offer only 150,000 PSI. The EVIL ENERGY kit's 210K PSI rating provides a significant safety margin, ensuring the small block Chevy head bolts do not stretch under the extreme pressures of high-compression or turbocharged setups.

Q: Why should I use washers with my small block Chevy head bolt kit?
A: Our kit includes 34 precision-ground washers. These are vital for protecting the cylinder head surface—especially aluminum heads—from galling and ensuring the SBC head bolt applies perfectly even clamping force across the entire gasket surface.

REVIEWS

No Amazon reviews available for this product.

RELATED PRODUCTS

Example product title
$74.99
$74.99
Example product title
$74.99
$74.99
Example product title
$74.99
$74.99
Example product title
$74.99
$74.99
Example product title
$74.99
$74.99
Example product title
$74.99
$74.99

RECENTLY VIEWED PRODUCTS