<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Charlie,</div><div><br></div><div>As a secondary measure....please make sure timing is set correctly and mixture isn't lean. Lean and retarded runs hot hot hot!</div><div><br></div><div>John Over</div><div>Denver<br><br>Sent from my iPhone</div><div><br>On Apr 3, 2015, at 4:37 PM, Charles Hubbard via Datsun-roadsters <<a href="mailto:datsun-roadsters@autox.team.net">datsun-roadsters@autox.team.net</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="FONT-FAMILY: Arial; COLOR: rgb(0, 0, 0); FONT-SIZE: 12px"><div> My 1964 SPL310 (1500) has run hot since day one. It has a fairly pristine 3-row radiator core. I live in the Dallas Texas, area, and it gets pretty hot around here. The stock idiot gauge steadily pegs on the highway at about 65 mph. I put an after market gauge in which showed the temperature close to 290 deg. Slowing down to 55 MPH brings the temperature down but it still runs at 275deg. After running around town and turning the motor off, it often blows most of the coolant from the upper tank through the overflow tube. It often vapor locks after it gets turned off. I took my radiator to the local old school radiator guru today. He did a flow test and it was fine. However, he noticed that my cap was pretty week. He thinks my stock cap may only be a 3-4lb cap and suggested that I purchase a 12 lb cap. . He's thinking that that my roadster may be continuously be losing coolant when it gets pressurised and allows air into the system, which makes the car run even hotter. A tighter cap would hold coolant better and help the cooling. The temperature would stay lower, even under more pressure. The stock radiator caps are not exactly growing on trees, so getting a 12 lb cap to give it a try may not be obtainable. The radiator shop says they can put a new cap assembly o the unit, but I hate doing that before I even know if it will solve my issue. Does anyone know a source for a 12lb cap that will fit a 1500 radiator? Feedback from those in the know would be appreciated.</div><div><br></div><div>.<span style="font-family: Arial; font-size: 12px;">Charlie Hubbard</span></div><span><div style="FONT-FAMILY: Arial; COLOR: rgb(0, 0, 0); FONT-SIZE: 12px">Flower Mound, TX<br><a href="mailto:cehubbard@verizon.net">cehubbard@verizon.net</a></div></span></div>
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