Join Date: Mar 2004
Location: Snohomish, Washington
Re: 67 Camaro still won't cool :(
It's a 468 with an 8-71 blower.
The above is the biggest reason it wants to run hot. Roots blowers add a lot of heat to the engine, but they are so cool.
Seriously, I was having trouble getting my new naturally aspirated BBC to stay cool and it has the big Griffin radiator, good water pump, big high cfm fans, and my cylinder walls are a almost a half inch thick (Dart Big M). The temperatures didn't seem to settle down until I got enough timing into the tune up at low rpm and low loads (high manifold vacuum). You may have a similar issues when you are not making boost, not enough timing. BBC's seem to crave lots of timing when they are not making much power. I have EFI, so I can do stuff with my ignition timing that you cannot do with a mechanical distributor.
Just to give you an idea of where I am at. When I am cruising at 1700 to 2000 or so rpm, at 20-to-21 inches of manifold vacuum, I have approximately 45 degrees of ignition timing. The temperature is running about 206 to 211 degrees with the sending unit in the head on the drivers side. If I moved it to the intake manifold up by the thermostat, it would probably read about 190 to 195 degrees. The engine is very happy and the plugs look great. Your results may vary, but I think that your ignition timing may have a lot to do with the problems you are having. I am not sure how much improvement you can make, if you have a mechanical distributor, you may not be able to get enough timing into the engine due to the limitations of the mechanical parts of the distributor before detonation becomes a problem somewhere in the tune up.
1967 Camaro 427 BBC, Viper T-56 6-Spd, Z28, Red w/ White Stripes
No, it's not stock.
No, it's not real.
No, it's not for sale.
It's just the way I like it.
2017 Corvette Grand Sport Z07
1998 Camaro Z28