Small Block Weiand Action+ vs. Edelbrock RPM Air Gap ET/MPH Comparo

Garrett Ellison said
Probably another .05-.10 in it once you get the jetting set. FWIW in the land of inter web misinformation, I’ve read that milling the plenum divider 1/3 of an inch from the floor, putting a one inch open spacer on and port matching a performer RPM is worth around 14 average hp from 3000 on up at the crank on the dyno. I myself would be weary about doing any more than that without a flow bench, Edelbrock actually did put a monumental level of R&D into those intakes. With the vehicle weight and wind resistance, I would think that a short height super sucker would be better than an open spacer. I trust a dragstrip a lot more than a dyno.

Im pretty sure I mentioned in my BP short block thread about my unique setup and lack of room to try carb spacers, (which sure would be nice if I could!) which is why I went through stages of cutting down the divider of the Weiand, where I actually saw improvements each time. Increasing the plenum volume via spacers isn't something I've been able to experiment with due to the previously mentioned engine cover. I could just leave the cover raised some and do the spacer thing, but as with removing various things like gutting west coast mirrors, passenger seat assembly, heater box, swapping alloy bumper brackets and glass bumpers etc I just don't wanna do that, those streeter items have to stay. I could, and I know I'd make the gains I'm after, but I want to do it on engine alone keeping this thing intact. Doing all that weight removal, for me, is akin to just adding nitrous:eek:....no offense to huffers! :rofl: