eddie SP2P intake

The Performer and other aftermarket intakes have the larger 340/360 ports so of course they flow better but... there will be step at port match to standard/small port 318 heads which impedes the flow to some degree. SP2P acronym = Standard/Small Port 2 Plane, was offered in 2 brl and 4 brl versions. Improvement over the stock single plane intakes found on much earlier LA, like 273, were improved low end torque and millage. That comes from any dual plane intake which you probably already have with the later model stock 2 barrel intake. Better fuel millage with this 4 brl intake versus the later/current 2 brl dual plane intake? If you can keep your foot out of it. LOL