Thanks RjCorazza - I'd really like to use the freeze plug block heater because there is less plumbing and once it is properly installed, there is less potential for leaks. I only have one freeze plug (left front freeze plug) that will allow access for a block heater installation. I would like to use the left middle plug for better heat distribution, but there is not enough room between the freeze plug and the starter. I can remove the starter for installation in the middle freeze plug, but I won't be able to reinstall the starter due to the block heater. Using the front left freeze plug is an option, but heat distribution will not be as even as the middle left plug. The block heater suppliers recommend installing them in the right middle freeze plug, but there is no space for a block heater on that right side. Installing in the left front freeze plug location may be best, even though heat distribution will be uneven. It'll take more time to warm the block before starting.