Headers increase head exhaust cc?
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Car: 1987 formula
Engine: 305 tpi
Transmission: t5
Axle/Gears: 3.45
Headers increase head exhaust cc?
So I am trying to keep my engine all tuned to the correct intake to exhaust cfm on heads and I am trying to figure out if compared to the stock manifolds and stock exhaust, if headers and a tuned length exhaust increases the cfm on the exhaust side of the heads. Its a hotter cam 305 and have the intake fully ported and a bunch of other aftermarket things. But before grinding on exhaust ports I wanna keep the intake to exhaust under 70%
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Re: Headers increase head exhaust cc?
So I am trying to keep my engine all tuned to the correct intake to exhaust cfm on heads and I am trying to figure out if compared to the stock manifolds and stock exhaust, if headers and a tuned length exhaust increases the cfm on the exhaust side of the heads. Its a hotter cam 305 and have the intake fully ported and a bunch of other aftermarket things. But before grinding on exhaust ports I wanna keep the intake to exhaust under 70%
Head port isnt changing in physical form. You are just getting more out of it by exhaust tuning
Now on a flow bench, perhaps pipe size and shape may show different flow numbers for the port, just like on the intake port size, different radius bell mouths vs clay inlets etc all have effects on the cfm you measure.
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