So, last season we got the top end improved just in time to make it to the last West Fargo Cruise Night. I had intended to post on our work as we did it but life has a way of getting busy. So, now, with winter in its last gasps (I hope!), and with some future work around the corner later this spring, I thought it would be good to post what we’ve done thus far. I hope this series will help others who likewise wish to hot rod their inline six for something different rather than transplanting in a V8 (especially in early Falcons and/or Comets). So, with the tear down complete, we turned toward installing the machined cylinder head. The cylinder head bolted on normally but when we went to install the carb adaptor and the carburetor itself, the putty the machine shop had used to build up the low areas had to be smoothed. When Micah was smoothing things out to make a clean fit, the machine shop’s putty flaked off. So, instead of just bolting things on, we had to build up part of the cylinder head in order to get a level, flat surface. We chose the Permatex version of “JB Weld” because it has a higher temperature tolerance. Here are some pictures of how we did that.
First, here’s a shot of what we encountered. Notice how chalky the putty was that came from the machine shop. Your thumb nail could remove it (which is why it flaked off when Micah was making sure the flange was smooth.
So, in order to address this, we had to use a dremel and emorycloth to remove all of it. We then used tape to create “dams” to hold the Permatex putty and made sure to tape over three of the threaded holds and insert a bolt into the one hold that needed build up all around it. Special thanks to our friend Thom for suggesting this is how we approach the problem after he saw the chalky stuff we were dealing with.
Once the putty was installed, we removed the bolt and had a surface we could smooth and level in order to install the adaptor and carburetor.
You will notice that the top two holes are in thicker metal and thus there’s more thread depth. This meant the bottom two holes (these are the front two, radiator end)had fewer threads. The hole in the bottom right, in fact, had just 2.5 threads. To remedy this, we had a very talent friend, Jim, create a nut plate to go under both of these holes. We then were able to thread the bolts through these holes into two nuts that were welded together as a small nut plate. The bolts did not extend past the nuts, so as not to disturb fuel flow into and through the head. I’ll continue with describing the build in the next post.