273 Exh Port MisMatch

str12-340 said
do a good job of routing modern material wires and you are golden. A lot of small blocks (at least mid 60s to early 70s) had good looms made into the valve covers and all of them have the plastic insulators available new.

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I used some 318 Valve Covers on mine So I could have a More Modern PCV System and the Plug Wire Routing was a Bonus.
I didn't care for the StovePipe Covers I had... They sold in a bout 10minutes in here! Lol