Best aftermarket intakes for an early 273?

65Val said

Actually, I believe "LD4B" stands for Late Dual Plane 4Barrel ('66-up 273-318 ), as the previous version was "D4B"('64-'65 273).

Just semantics...not important.

...and ,actually, the stock, flat, single plane, cast-iron "pig-of-an-intake" makes pretty good power.

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I think you're right about the semantics. As to the cast iron pig, I used one of those before I bought the Offy & the Offy made a night & day difference, great improvement over the factory manifold. If I remember right, a factory 318 2bbl manifold has a higher rise than the 273 4bbl. It worked, but to me it never looked like much thought was put into it.

One more flog at the dead horse. I had a friend with a 318 in a 72 Challenger who ran a Dual-Port with a Thermo-Quad. Performance was okay but nothing spectacular. Admittedly, he wasn't much into trying to get a lot of performance out of his car. He was more of the bolt-it-on-&-not-mess-with-it-any-more kind of guy.

Kind of funny story. About a year out of high school his family moved about 400 miles away to Arkansas. The following Thanksgiving I swapped in a set of 3.23 gears & drove down to visit him in my Barracuda. He had moved before I had done a lot of the work to my engine. I let him drive my car & I can still remember him punching the throttle with a big grin on his face. He kept looking over at me & laughing and saying "I can't believe this is just a 273!"

Like I said, I had a lot of fun with it.