Technical > Matt Shaff's Engine Shop
Zoomies vs collector headers
JEFF/21C:
1 5/8" zoonies is what we had on the 305 sbc and 1 3/4" x 46" weed burners on a 406 sbc fed was for the look and sound
e-drag:
We are going with collector headers on our NE2 build. This is how we did it back in the 70s. I would rather run a vacupan then a smog pump that is for sure. Zoomies do look cool, but crankcase pressure is something that needs to be addressed.
wideopen231:
Understand it makes difference on a carb motor. My doctor told me with diabetes that I need to limit carbs and I told him I have not had one of those since 1985 and no way I would have one on race car/MPO Zoomies might lose some bottom end, but hey I have 6600 stall converter so who cares about the bottom end. Another consideration is some n0ostalgia classes' don't allow collector headers. Cool factor,weight and sound are other reasons I run zoomies. I know few that have seen cpl hundredths difference but they were bracket and did not care. One more thing is I have built quite a few sets for other racers and me not run ning them would just be a bad showing.LOL
JEFF/21C:
WITH ZOOMIES You tune for one rpm were as collector type headers the torque and hp band is longer it all depends on what you want or are required to run,(the track was in court) we changed because we had to run mufflers, one guy kept his zoomies ran eight small round mufflers. and like it has been stated small lower powered carburated motor with a low stall convertor need all the help available
masracingtd1167:
If you are running a carb the collector header will help with tuning ! I tested a to b to a on my car and found no change at all When I built my roomies I laid them out so I would not get fumes in my eyes and I'm very happy with them !
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