Small Block Ford: Short vs Long Water Pump plus Balancer and Block Info

Concept One offers serpentine pulley kits for 289, 302, 351W Small Block Ford engines in two configurations: Long water pump and short water pump. Most applications -- such as a "bumpside" pickup or a 69 Mustang -- can utilize the long water pump version. However, you may have a 32 Ford with an extra tight engine bay or a 65 Mustang with an extra thick radiator and fan combination or an early Bronco. If this sounds like you, consider our pulley kit for short water pumps. The design adds 1.55" clearance between your engine and your radiator/fan. It requires a timing cover and water pump from a 94-95 5.0 Mustang, sold separately.

Short or long style, Concept One serpentine pulley kits require the use of a reverse rotation water pump.  If you're not sure what water pump you have or need, please do not hesitate to give us a call or email us pictures of your water pump and engine bay before ordering.  We are happy to help.

Short Water Pump Part Numbers

Short water pump pulley systems (SFM part numbers) are a good choice for applications where there is a minimum amount of room between the engine and radiator. This combination is 1-1/2 inches shorter than the long water pump kit. Requires the use of a reverse rotation 94-95 Mustang water pump and timing cover and electric fuel pump.

	Water Pump/Timing Cover Kit:  Ford Performance #M-8501-A50 (1994-95 Mustang). Note: This part number is no longer available from Ford Performace as a kit, but the part number is kept here for reference.
	Water Pump: 1994-95 Mustang 5.0 -  Ford Racing #M-8501-D50.  Alternate/OEM Part Number(s): Ford #F4ZZ-8501-B, Gates #43065, GMB #1251920 (OE) or #1251920P (performance), AC Delco #232325, Airtex #AW4087
	Timing Cover: 1994-95 Mustang 5.0 -  Alternate/OEM Part Number(s): Ford #F1SZ-6019-A, All-Star #ALL90015, ATP #103039, Pioneer #500302T, Dorman #635-106

 

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Long Water Pump Part Numbers 

Long water pump (SFL part numbers) pulley systems are the same length as factory Ford standard rotation systems and will fit most applications. Must change to a reverse rotation water pump, but most 1970 & up timing covers will work. Works with electric or mechanical fuel pump.

	Waterpump: 1986-93 Mustang 5.0 -  Ford Racing #M-8501-C50.  Alternate/OEM Part Number(s): Ford #F3ZZ-8501-B, Gates #43272 (OE) or #43272P (performance), GMB #1251560 (OE) or #1251560P (performance), AC Delco #252669, Motorcraft #PW291
	Timing Cover:  Ford Racing #M-6059-D351 or 1970 & up equivalent.  Alternate/OEM Part Number(s): California Pony Cars #ENG-000-408, Pioneer #500302S, Scott Drake #C5OZ-6019-B, Dorman #635-107

 

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Which Water Pump and Timing Cover Do I Have?

Use these pictures to identify your water pump and timing cover. As always, there are exceptions to this illustration. Particularly, some late model long water pump timing covers may have the fuel pump boss either blocked off or not there at all. Don't hesitate to call us if you have a question.

	Short water pump and Timing cover This timing cover DOES NOT have provision for a mechanical fuel pump This timing cover DOES NOT have provision for a dipstick tube Timing cover used on 1994-95 Mustangs, various Explorers, and older Ford Racing crate engines This is the style required for our Short Water pump-style pulley kits.
	Long Water pump and Timing cover This timing cover has provision for mechanical fuel pump Most common timing cover used on many Ford models This is the style required for our Long water pump-style pulley kits.

 

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Crankshaft Damper aka Harmonic Balancer

	All Concept One small block Ford pulley kits are designed for the factory 4 bolt pattern damper shown here Crankshaft Damper: 1970-80 302 and 1970-97 351 engines, 28 oz. - Ford Racing #M-6316-K351.  Alternate/OEM Part Number(s):  Ford #E8TZ-6316-B, Powerbond #PB1214, Pioneer #DA3513, Dorman #594011 1981-95 5.0 engines, 50 oz., - Ford Racing #M-6316-M50.  Alternate/OEM Part Number(s):  Ford #E4TZ-6316-A, Powerbond #PB1084, Pioneer #DA3021, Dorman #594024
	Ford Racing and aftermarket 4 bolt dampers like the one shown here can be used with the addition of a crankshaft pulley spacer Crankshaft Damper: 1970-80 302 and 1970-97 351 engines, 28 oz., - Ford Racing #M-6316-C351 or equivalent 1981-93 5.0 engines, 50 oz., - Ford Racing #M-6316-A50 or equivalent
	Crankshaft Pulley Spacer:  Ford Racing #M-8510-B351/ thickness: 0.950".  Alternate/OEM Part Number(s):  Summit #329707 Crankshaft Pulley Spacer:  Ford Racing #M-8510-C351/ thickness: 0.875" / use if your engine has double roller timing chain.  Alternate/OEM Part Number(s):  Summit #329708

 

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Engine Block Accessory Hole

Most 1970 and newer blocks have an accessory hole on the passenger side of the front face of the block. Most older blocks do not have this hole. Our standard "long water pump" pulley kits have a bracket that bolts to this hole, but we have an alternate bracket that bolts to the ground strap hole for blocks where this hole is not present. There is no difference in price, we just need to know if this hole is present or not.

Boss blocks including the new Ford Racing Boss block have an unmachined boss and no drilled and tapped hole. To make matters worse, the ground strap hole has been moved on this block so our alternate bracket will not fit. The best solution for Boss blocks is to grind the unmachined surface as flat as possible and drill and tap the hole for our standard bracket.

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Additional Notes

• Concept One Pulley Kits are designed for use with electric cooling fans. If you need to run a mechanical fan, we can make modifications to the water pump pulley. Also, if you use a mechanical fan, remember that this kit uses a reverse rotation water pump, so make sure the fan is a reverse rotation fan.
• When using Concept One pulley kits in older Fords with the radiator inlet on the passenger side, lower radiator serpentine conversion hoses are available for some applications or custom hoses such as Cool-Flex® can be used to reroute the radiator hose.
• Ford 90° thermostat housings are recommended
• Typical rack & pinion units used in the aftermarket are the Mustang 2 (less common) and the Fox Body Mustang / Thunderbird racks (more common).  Mustang 2 racks generally need to run in the 800-900 psi pressure range.  Fox Body Mustang / Thunderbird racks (NAPA part number often used - 22-203F) generally run in the 1100-1200 psi range