Years ago, I had a set of JR Headers that were custom "Flat Collector" headers.
They adapted "D-Port" ported Heads to "Round Port" Headers.
They used a very unique adaptor plate that attached to the heads with "counter-sunk" head fasteners.
Then, the round port headers attached to the Adaptor plate using different mounting holes vs the Pontiac ones.
These headers were extremely to install or remove and the fasteners to the heads were "Trapped" and could not back off.
The header plate fastener holes were away from the heat of the exhaust ports on the head and would not "back off" either.
Some very nicely designed and built headers and how they were retained on the D-Port heads.
Food for thought.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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