Dynomax Headers on my 1969 K20

Here are some pics of my headers now that they are installed and fitted. This is on my 69 with a 454. These headers are Dynomax Cermacoated headers, part number 86022, designed for the 67-87 BBC 2WD. The headers for 73-87 BBC 4WD would not work. The engine is sitting in the small block engine crossmember using the original small block style engine mounts, however I cut the crossmember to add in about 1" of additional drop of the bottom of the crossmember to gain oil pan clearance. To make these headers fit I did not have to make any modifications to the driver's side other than I did have to go with a shorter oil filter as this engine has an oil cooler setup which put the larger oil filter in contact with the headers. On the passenger side I had to remove a little bit of frame to give clearance for the first and second header tubes. I would guess I removed about 1/4". I also ended up grinding off a little bit of the engine crossmember tower as it was in contact with the bottom of the first header tube. I also used a 1/4" spacer between the crossmember and the engine mount to raise the engine a bit to help with header clearance. The above modifications have me comfortable with the clearance around the oil pan and passenger side headers.

These photos show spacers I temporarily used and the area of the frame that I clearanced. I now have a 1/4" spacer betweeen the engine mount and the crossmember to assist with fitment of the headers.

I will be using a hydraulic clutch. Here you can see that there would be modifications necessary to use the stock clutch linkage.

I also had an X-Pipe made for me that I will used on my K20 along with Dynomax Ultraflow mufflers. Ought to be loud!!

The system is 3" pipe from the headers to the x-pipe, then 2 1/2" to Dynomax UltraFlo's and continues as 2 1/2" pipe dumping at the rear of the flatbed angled down slightly. The truck is running pretty rough, back firing or missing - now that I can actually hear the motor it sounds like a timing issue and a rocker or two need to be adjusted. Here are some pics of the system.

Rather than use the collector piece that came with the headers, American Muffler made their own piece

The passenger side collector was fairly close to the transfer case. Here is a pic of the pipe coming over the transfer case

Here is the X-pipe installed directly behind the transfer case

And here is an example of the welds at the X-pipe

Here are the Dynomax mufflers

Pretty straight shot to the rear of the truck

The pipes dumb right before the hitch and are well protected

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