[Gary D]

Originally Posted by sjdiesel

Im looking at purchasing a set of Doug’s D567 headers for my 1967 GTO. Looking for feedback on how well they fit.

Anyone out there running these?

https://www.summitracing.com/parts/dou-d567

I ran an older set and they fit well. I know the company changed to Pertronix a bit later. I know a very reputable Pontiac builder and he dyno'd the RA manifolds to headers in comparison and said he saw no difference until and after 550 HP at the crank. Just one builders opinion. I run the RA manifolds on both my 67's. When it comes to ease of pulling the motor and oil changes it's much easier and 4 speeds are more friendly to work on clutches and "Z" bars.

[gassman_67]

I have Doug's D port on my Kaufman heads, clearance is good, glad I got new engine mounts and some custom spacers that fit under the mounts.

[64speed]

I’m running RP Edelbrock heads with Dougs headers and I have no fitment issues. I also use a Wix 51258 or Baldwin B39 with a QuickTime scattershield and I can get them in and out fairly easy