Best aftermarket intakes for an early 273?

Could be right.......

My next question is, what does the SP2P mean?????


What engine was the LD4B made for?

Dual ports take a lot of tuning, but are so efficient, and crisp when they are done!

SP2P = Single Plane / 2 Plane

LD4B was designed for '66-up small port 273/318 heads.

D4B was for early 273 ('64-'65) heads(with the weird bolt size and angle.)