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Posted by: ETMracing Sep 23 2014, 08:58 AM

I am currently running a 2.0/4 with a cam and dual 44idf webers on Tangerine cable linkage and short intake manifolds. My question is what are the benefits/downsides on the taller intake manifolds? I have the option to run both

Posted by: Bruce Hinds Sep 23 2014, 02:28 PM

I was really hoping someone would chime in on this, I've wondered the same thing myself.

I know some of the high performance SBC heads have longer intake runners. I have noticed that some of the intakes used for higher RPM will be taller and some designed for torque will be shorter.

Posted by: SirAndy Sep 23 2014, 02:37 PM

You got that backwards!


Taller intakes give you a bit more low end torque, shorter intakes will give you a bit more high rpm power.

Posted by: Triaddave Sep 23 2014, 02:59 PM

I installed the tallest manifolds that would fit (with the carbe and filter) under the deck lid

Posted by: Bruce Hinds Sep 23 2014, 03:08 PM

What else is new!

Posted by: URY914 Sep 23 2014, 06:38 PM

Depends on your cam and the entire combo.

Posted by: stugray Sep 23 2014, 08:56 PM

I know that on my other NA boxer engine there is an aftermarket part (crawford billet power blocks) that extends the intake manifold runner length over stock.

This results in an almost perfect shift of the torque curve downwards in the RPM range.
So if even remotely apples to apples:
longer runners = higher torque at lower RPM
shorter runners = higher torque at higher RPM