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Small block water pump interchangeability #1315895 10/05/12 04:47 PM 10/05/12 04:47 PM
Joined: Mar 2003 Posts: 2,505 PA moparacer OP master
moparacer OP master Joined: Mar 2003 Posts: 2,505 PA	I have a 66 Barracuda that I am working on for someone that overheats. The coolant does not seem to circulate very fast after the thermostat is open and I noticed it has a old style cast iron water pump (67 and older I think) on a newer 80s 318 that originally took the newer style aluminum water pump. Will these older style pumps work ok on the newer style timing chain covers? Thanks! 67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174

Re: Small block water pump interchangeability [Re: moparacer] #1315896 10/05/12 05:55 PM 10/05/12 05:55 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	I think you can run that wp on a late model t cover but... it will hide the timing makes with the wp outlet and may have pully alinement issues. the way to do it would be run the early t-cover with early WP and early pullys and alt brackets. either WP should cool a SB if the rest of cooling system is up to par. pull the rad and pressure test water flow to see if it is in need of a recore. being the early wp is skinny on a late model cover it might have impeller clearance issues. make sure the lower hose is not sucking closed, may need a spring in the lower hose. remove t-stat and recheck rad flow after warm up. check t-stat in a pot of water to make sure it opens all the way. did you check engine tune,timing,vac reading, A/F ratio? a lean engine will run on the warm side. most of my junk either has leaked or a new rad always fixed the cooling system keeping them in the 180* range during summer time daily driving here in Fl.

Re: Small block water pump interchangeability [Re: scratchnfotraction] #1315897 10/05/12 06:47 PM 10/05/12 06:47 PM
Joined: Mar 2003 Posts: 2,505 PA moparacer OP master
moparacer OP master Joined: Mar 2003 Posts: 2,505 PA	I pulled the rad and am going to flush it out or rod it out if needed.(I own a radiator shop) The coolant looks pretty bad so I am flushing the entire system and it had a 195 stat in it so I am going to replace it with a 180 and go from there. Just never seen a old style pump on a new style timing cover before. I know if the impeller isnt designed right it can cause a circulation problem. 67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174

Re: Small block water pump interchangeability [Re: moparacer] #1315898 10/05/12 09:52 PM 10/05/12 09:52 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Just never seen a old style pump on a new style timing cover before. I'm running a pre '70 iron pump on an 80's 318 with the 80's 318 timing cover cuz I wanted to keep my original radiator (65 dart) and no issues. To the best of my knowledge the inside "flat" of the cover that the impeller faces is identical between the 2 covers just that the timing marks are on opposite sides. You can add an anticav plate on the vanes and mill the front of the cover to reduce the impeller to flat clearance to ~.040" or so for a much more efficient pump as part of blueprinting a cooling system but as you surmised your problem is elsewhere. I wanted to ask if it runs hot at speed or idling or stoplight to stoplight and is it a recent problem. Holler how the rad work for it turns out live every 24 hour block of time like it's your last day on earth

Re: Small block water pump interchangeability [Re: RapidRobert] #1315899 10/06/12 12:59 AM 10/06/12 12:59 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	What good is it going to do to change from the 195 to a 180 stat. The number ratings are for when the stat is wide open. If it doesnt flow well with the 195 its not going to flow any better with the 180. Rod out the rad.. I am truckless..

Re: Small block water pump interchangeability [Re: 340SHORTY] #1315900 10/06/12 01:15 AM 10/06/12 01:15 AM
Joined: Mar 2003 Posts: 2,505 PA moparacer OP master
moparacer OP master Joined: Mar 2003 Posts: 2,505 PA	Quote: What good is it going to do to change from the 195 to a 180 stat. The number ratings are for when the stat is wide open. If it doesnt flow well with the 195 its not going to flow any better with the 180. Rod out the rad.. Once I get the cooling inefficiency straightened out I don't want a 195 stat in it, I want a 180 in it. When I flushed the system out tonight I had the 195 out. I think that's the best time to put in the 180. 67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174

Re: Small block water pump interchangeability [Re: moparacer] #1315901 10/06/12 01:37 AM 10/06/12 01:37 AM
Joined: Jul 2003 Posts: 6,167 Maryland GO_Fish master
GO_Fish master Joined: Jul 2003 Posts: 6,167 Maryland	Non A/c car I'm guessing??? Make sure it has the correct 8 (?) vane pump and not the a/c 6 vane pump. They had different diameter pulleys to spin the pump faster for a/c cars. Mixing and matching pulleys and pumps can cause cavitation and overheating. Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph

Re: Small block water pump interchangeability [Re: GO_Fish] #1315902 10/06/12 07:01 AM 10/06/12 07:01 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	Quote: Non A/c car I'm guessing??? Make sure it has the correct 8 (?) vane pump and not the a/c 6 vane pump. They had different diameter pulleys to spin the pump faster for a/c cars. Mixing and matching pulleys and pumps can cause cavitation and overheating. I matched up the HD 5/8" shaft WP with 8 vanes with my larger non a/c pully on my SB. runs right at the 180* t-stat rating. for me the fix was a new replacement rad that was a max cooling all brass/copper 3 row rad. replacing a 35 yr old 2 row stock rad.

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