For a Small-Block Chevy with double hump heads, the most relevant options here are accessory brackets designed to fit those heads. The ICT Billet 551576 is best for an alternator and power-steering-pump setup, while the LWP adjustable bracket and ICT Billet 551672X are alternator-only choices for long-water-pump, V-belt configurations. Check your engine and accessory measurements before choosing; the supplied product list contains three relevant brackets, not five.
| Product | Best For | Key Detail |
|---|---|---|
| ICT Billet 551576 | Alternator and power steering | Double hump or standard heads; long water pump |
| LWP Low Mount Adjustable Bracket | Replacing an alternator bracket | 12SI-style alternator bolt spacing specified |
| ICT Billet 551672X | Billet aluminum alternator bracket | Includes mounting bolts and hardware |
ICT Billet 551576 Accessory Drive Kit
This kit is designed for Small-Block Chevy engines with double hump or standard heads. Its listed applications include 305, 327, 350, and 383 engines, as well as 5.0L and 5.7L V8s. It is compatible with a V-belt system and a long-style water pump.
Best for: Builders who need a bracket setup for both an alternator and a power steering pump. It stands out among these options because its name and description specify both accessories, rather than an alternator alone.
Check before buying: Confirm that your engine uses the listed long-style water pump and V-belt arrangement. The supplied details do not specify alternator bolt spacing or every included component, so verify those points for your particular setup.
LWP Adjustable Low-Mount Alternator Bracket
This bracket is listed for Small-Block Chevy 305, 327, and 350 engines, including 5.0L and 5.7L V8s, with a long water pump, carburetor, and V-belt. The fitment notes specify Chevy alternators with 6.56-inch center-to-center bolt holes, described as 12SI style. Its slotted tension design allows belt adjustment, and the bracket uses steel and aluminum.
Best for: Buyers replacing an old or broken alternator bracket who can confirm the stated engine, pump, belt, and alternator measurements. The specified bolt spacing makes this a useful option to compare against an existing alternator.
Check before buying: The fitment notes are specific about 12SI-style bolt spacing. Avoid choosing it based on the double hump description alone if your alternator’s mounting-hole distance or accessory layout differs.
ICT Billet 551672X Alternator Bracket
The ICT Billet 551672X is an adjustable alternator bracket for Small-Block Chevy applications with double hump heads. Its description identifies it as a replacement for a stamped-steel factory bracket and lists aerospace-grade billet aluminum construction, a satin finish, and included mounting bolts and hardware. The slotted tension design is intended to help maintain belt tension.
Best for: Buyers who want a billet aluminum replacement bracket and prefer a kit that lists mounting bolts and hardware. It is a direct comparison to the LWP option when selecting an adjustable alternator bracket.
Check before buying: The supplied features do not give alternator bolt spacing or a complete engine-and-pump fitment list. Confirm those details with the product information and compare them with your current setup before ordering.
Buying Guide: Choosing Brackets For Double Hump Heads
Do you need an alternator bracket or a full accessory setup?
Start by listing the accessories you need to mount. The ICT Billet 551576 is the only option here described for both an alternator and power steering pump. The LWP and ICT Billet 551672X listings describe alternator brackets. A single alternator bracket may not meet the needs of a build that also requires power-steering-pump mounting.
Which water pump and belt system does your engine use?
Compare your current setup with the listing before purchasing. The products identify long-style or long water pumps and V-belts in their fitment details. Do not assume that a bracket designed around those components will suit a short water pump or a different belt arrangement. Check pulley alignment and belt routing as part of the installation plan.
How should you verify alternator fitment?
Measure the alternator’s mounting-hole centers and compare them with the bracket’s specifications. The LWP listing gives a 6.56-inch center-to-center measurement for 12SI-style alternators. The supplied details for the two ICT Billet brackets do not provide that measurement, so confirm fitment rather than assuming all Small-Block Chevy alternators use the same mounting dimensions.
Is billet aluminum or steel-and-aluminum construction preferable?
The ICT Billet 551672X is described as aerospace-grade billet aluminum, while the LWP bracket is described as made from steel and aluminum. These material descriptions help distinguish the listings, but they do not establish which bracket is right for every vehicle. Choose based on verified fitment, included hardware, and the accessory arrangement you need.
Frequently Asked Questions
Do these brackets fit Small-Block Chevy double hump heads?
The listings identify the ICT Billet 551576 and 551672X for double hump heads. The LWP listing also names double hump heads and specifies additional engine and alternator fitment details. Confirm the complete accessory layout before purchase.
Which option includes power-steering-pump mounting?
The ICT Billet 551576 is described as an alternator and power steering pump accessory drive bracket kit. The other two products are described as alternator brackets.
Are these brackets for serpentine belts?
The supplied features identify V-belt compatibility for the 551576 and LWP options. The 551672X description also refers to maintaining belt tension but does not specify a serpentine setup. Verify belt-system fitment before buying.
What should I measure before ordering?
Check the water-pump style, belt type, alternator mounting-hole spacing, and required accessories. For the LWP bracket, compare the alternator against the listed 6.56-inch center-to-center bolt spacing.