[Chevelle-list] Long vs. Short Water pump
I am building up a 396 for my 67 Chevelle and wondering whether the long or short water pump is preferable. In an effort to keep weight down, I want to go with an aluminum pump. What is the difference? With the standard mounts and core support - I would like to use an aluminum 4 core radiator - is there and clearance problem? Bill
Re: [Chevelle-list] Long vs. Short Water pump
While 3-core or 4-core is a common term, radiators only have 1 core. It's the number of cooling tubes you're concerned with. Due to size constraints with either water pump setup I don't think you'll find a 4-tube aluminum radiator; more likely a 2-tube design of 1-inch tubes. A short water pump was used in 67. While you can use a later long pump it will limit clearance with a thicker radiator and will require all the brackets, braces, and pulleys for a long pump. Long pumps are 1.25 to 1.50 inches taller than short pumps. I had a 69 engine in my 67 with a long pump and wound up with about 2-inches between the fan and radiator after having to use a 1/2-inch fan spacer to allow the fan blade clearance from the accessories. And that was with a stock 3-row radiator. With a 2-tube aluminum radiator (usually 2-inches thick; 2 rows of 1-inch tubes) the space was cut to about 1/2-inch. Enough to cause one to have to remove the radiator in order to get the fan off because there wasn't room to get a wrench on the fan bolts. Any thicker radiator may cause clearance problems. If I were doing it over again, I'd use the short pump setup if you have factory p/s, alt, A/C, brackets, braces and pulleys. I used a March system that allowed for a later one-piece style p/s pump but it included all the brackets and pulleys. Dale McIntosh ChevelleCD.com ChevelleStuff.com -Original Message- From: [EMAIL PROTECTED] [mailto:chevelle-list- [EMAIL PROTECTED] On Behalf Of Bill Sent: Saturday, July 19, 2008 9:37 AM To: The Chevelle Mailing List Subject: [Chevelle-list] Long vs. Short Water pump I am building up a 396 for my 67 Chevelle and wondering whether the long or short water pump is preferable. In an effort to keep weight down, I want to go with an aluminum pump. What is the difference? With the standard mounts and core support - I would like to use an aluminum 4 core radiator - is there and clearance problem? Bill
Re: [Chevelle-list] Long vs. Short Water pump
Thanks - great advice Bill -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Dale Sent: Saturday, July 19, 2008 11:06 AM To: 'The Chevelle Mailing List' Subject: Re: [Chevelle-list] Long vs. Short Water pump While 3-core or 4-core is a common term, radiators only have 1 core. It's the number of cooling tubes you're concerned with. Due to size constraints with either water pump setup I don't think you'll find a 4-tube aluminum radiator; more likely a 2-tube design of 1-inch tubes. A short water pump was used in 67. While you can use a later long pump it will limit clearance with a thicker radiator and will require all the brackets, braces, and pulleys for a long pump. Long pumps are 1.25 to 1.50 inches taller than short pumps. I had a 69 engine in my 67 with a long pump and wound up with about 2-inches between the fan and radiator after having to use a 1/2-inch fan spacer to allow the fan blade clearance from the accessories. And that was with a stock 3-row radiator. With a 2-tube aluminum radiator (usually 2-inches thick; 2 rows of 1-inch tubes) the space was cut to about 1/2-inch. Enough to cause one to have to remove the radiator in order to get the fan off because there wasn't room to get a wrench on the fan bolts. Any thicker radiator may cause clearance problems. If I were doing it over again, I'd use the short pump setup if you have factory p/s, alt, A/C, brackets, braces and pulleys. I used a March system that allowed for a later one-piece style p/s pump but it included all the brackets and pulleys. Dale McIntosh ChevelleCD.com ChevelleStuff.com -Original Message- From: [EMAIL PROTECTED] [mailto:chevelle-list- [EMAIL PROTECTED] On Behalf Of Bill Sent: Saturday, July 19, 2008 9:37 AM To: The Chevelle Mailing List Subject: [Chevelle-list] Long vs. Short Water pump I am building up a 396 for my 67 Chevelle and wondering whether the long or short water pump is preferable. In an effort to keep weight down, I want to go with an aluminum pump. What is the difference? With the standard mounts and core support - I would like to use an aluminum 4 core radiator - is there and clearance problem? Bill
