Wayne.  Here is a summary of what was dyno tested on a pair of iron intakes.  On a ECZ-B four hole intake, the 2” four hole spacer had lower peak and average numbers than when using a 2” tapered carb spacer.  Transitioning into the intake at the carb holes does not seem to be the key here. Running that same intake without any spacers had lower numbers than what was seen using spacers.  The intake just likes spacers.

 

On an ECZ-B intake that had the carb holes slotted, the 2” tapered spacer outshined a 2” HiFlo (4 holes into 4 squares), a 2” Offy dual slotted, and a 1” HVH dual slotted spacer.  No spacer at all had the lowest values of all.  It would appear that it’s hard to go wrong with the tapered carb spacer design on the ECZ-B intakes.

Lorena, Texas (South of Waco)

Ted, I think what he is referring to is a tapered spacer from the large hole to small hole manifold, being placed upside down, so the smaller end matches the intake. Would that create an increase in velocity at that bottleneck to aid in low end torque?

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Ted or anyone, your thoughts on running which spacer on a 306 with mummert heads and intake? any input in the matter would be most helpful. thanks..

1956 F-100 in the works.

Based on the results that Ted got from my engine, I would start with the HVH 2" tapered spacer. But and a big but, every engine is different and what works for one combination may not be good for another. I am old school and always had my doubts about dyno tuning, but I am convinced that if Ted had not taken the time to try different combo's, I would have a 385 HP engine instead of a 415 HP engine. From my experence with stock cars, I would have stuck a four hole spacer on it and called it good. Dyno time and a good tuner is dollars well spent, it might take a seasons trips to the track trying different things to find what you can in a day on a dyno.

Glen Henderson



Freedom is not Free

Letohatchee, AL

Hadn’t thought of trying the tapered spacers upside down; holes on the bottom instead of the top.  Down the road when there is a four hole intake back on the dyno, I’ll give that scenario a whirl.  At this point, I’m even thinking two tapered spacers with the open cavities matched up together and the holes themselves at the carb and the intake.  Lots of possibilities here when talking about combinations.

Lorena, Texas (South of Waco)

If the engine is just going to be a steady state cruiser and never see over 3500 rpms, then a four hole spacer under the carb will give the best lowend torque numbers.  If you want additional passing gear performance, then the tapered spacer design shines.  With the aluminum heads, torque increase is substantial so the tapered spacer design would work out to be the best overall.

Lorena, Texas (South of Waco)

thanks for the info guys!

1956 F-100 in the works.

Continuing on with my blower motor project, I've elongated the holes in my "B" intake and since this will be a street motor, I went with a Quick Fuel 1" tapered hole phenolic carb spacer (P/N 300-4150-1) that I will use with either a Holley 4150 HP or double pumper carb. I'm a little confused on the spacer gaskets (which ones to use where), to weld in or epoxy fill the gaps left under the gasket and if I should try to do any additional port matching. Here are a few pictures of whatI have going on.

 

 

Rono

  Ron Lane,  Meridian, ID

Ron, on the slotted intake i would go with the open gasket otherwise the 4 hole could rip out between bores and peices go through your motor with no support under them.

Ted/John, just thinking about the blowthrough scenario, could it be that being open, the manifold is slightly charged but when the valve opens the air has to search for that open valve and you have the air going all sorts of directions fighting and bumping into itself to get to whichever valve is open. whereas in a direct 4 hole combination, each runner has a full charge and is ready to enter the cylinder as soon as the valve opens? I guess an 8 hole (2-4bbl) would be optimal if it was the case.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Definitely match the intake to the spacer opening and put a radius on the transition from the carb to the runners. You can epoxy the recessed portion and carefully file it flat. I'd use either an open or divided gasket between the spacer and manifold - you can trim your four hole into a divided or open gasket. It really won't make a whole lot of difference which gasket you use.


Lawrenceville, GA