Well, considering the engine is to be run to 6500rpm, and low end, off-idle torque isn't a concern, the RPM II should be the intake of choice, but the 185's would still have been a better head choice to accompany it, IMO. The 165's are an excellent street head and designed to breathe well from the idle-6000rpm, but will rapidly take a downward spiral soon after that. The 185's are designed to run from the 1500-6500rpm margin where you seem to be planning on spending most of your time and would still be a better choice, regardless of the engines 306 displacement. If high RPM's are what you're looking for, I'd consider have the 165's ported. If not, then stick with the Regular RPM intake and concentrate on a cam selection that's going to give you a better bang within the idle-6000rpm parameters and stick with a set of 1 5/8 headers. You could run the big intake with the 165’s, and 1 3/4, but you’ll definitely be leaving some power on the table at both ends and might find yourself with less than dramatic low end and a not quite capable top end.Bad Animal said:the 185's and 165's share the same exhaust ports. I don't care about street use!! I felt the 185's would be major overkill on a 306. And a 1 5/8 inch header won't even cover the exhaust port on these heads!! THe 165's are producing as much a 500 hp with a naturally aspirated combo. The motor will be shifted at approximately 6500 RPM.
Bad Animal said:My combo is a 306 with afr 165 with a custom cam (550/560), 70mm tb, 75maf, 30# injectors, 3.73's, TKO tranny, 1 3/4 longtubes. What intake do you guys recommend?? The RPM or the RPMII?? Also what kind of fuel pressure do you recommend I start with??? It was running rich at 35#'s!!!! Thanks in advance
Bad Animal said:My combo is a 306 with afr 165 with a custom cam (550/560), 70mm tb, 75maf, 30# injectors, 3.73's, TKO tranny, 1 3/4 longtubes. What intake do you guys recommend?? The RPM or the RPMII?? Also what kind of fuel pressure do you recommend I start with??? It was running rich at 35#'s!!!! Thanks in advance
8urlt1 said:i dont think thats a custom grind. its favoring the exhaust any custom cam designer would not favor the exhaust on a set of afrs they need no help on the exhaust side. You better start by sending that back and getting your money back. i honestly dont think anyone can give you an accurate intake selection without the duration of the cam rather the lift. Whats this car going to see more, Track or Street?
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