+2 or 3 for the Baldwin B-39. Haven't used anything else since we found and tested these about 15 years ago. They are also just a tad shorter than most full size filters and provide a little more header clearance and easier to install on many applications that are using 4 tube headers.
I'd add here that no other filters we've used or tested has as fast of a response on the oil pressure gauge when you rev the engine. These are full-flow with no anti-drain back devices......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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