Engines and Components› Cylinder Heads and Components

ENGINEQUEST

4.3L V6 Cylinder Head Bolt Set

$156.00

SKU: EQ-HB263N

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The EngineQuest EQ-HB263N is a cylinder head bolt set designed for Mercruiser 4.3L V6 engines. It is a direct replacement for factory bolts, and crosses with part numbers 10-11966, 10-11967, and 10-11968. These bolts are made in the United States and come with a 1-year warranty.
Show original supplier description
The EngineQuest EQ-HB263N cylinder head bolt set is essential for rebuilding your Mercruiser 4.3L V6 engine. It is crucial not to reuse old head bolts, as they can stretch and lead to failure. This set provides all the necessary head bolts for a proper and reliable engine rebuild. Manufactured in the United States, these head bolts ensure top-notch quality and consistent performance. They are brand new, not reconditioned, guaranteeing full clamping force for a secure and dependable head gasket seal. The EQ-HB263N directly replaces factory bolts and is compatible with part numbers 10-11966, 10-11967, and 10-11968, offering a seamless integration into your engine. Whether you are working on a marine application or an engine stand, having the correct hardware is critical for engine integrity. These bolts eliminate the worry of snapped bolts or uneven torque, ensuring the job is done right and providing peace of mind when starting your V6 engine. The set includes a 1-year warranty for added assurance.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandENGINEQUEST
Part NumberEQ-HB263N
CategoryEngines and Components

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy