[C2] Long Tube Headers - 65 Convertable
03-24-2017, 08:14 PM
#21
Drifting
You may want to consider Brzezinski ported manifolds. I just put a set on my 66 with vette Packs side exhaust and the difference was huge. I had them cermanic coated and they look awesome. I also used 2 1/2 inch mandrel bent pipe to the vette packs. I have the Steeroids and clearance is a non issue. Check my prior posts for some videos.
The only way to improve on ported 2.5" rams horns is to install full long-tube headers with primary tubes of at least 30". This can provide the additional benefit of the pressure wave tuning that makes long tube headers unique.
Even so, putting mufflers on long tube headers (adding back pressure) tends to partially defeat the benefits of pressure wave tuning.
I recently did some dyno testing on a 383 where I compared headers-with-mufflers to 2.5" rams-horns-with mufflers. There was not much difference below 3800 RPM (maybe 10 HP), but the difference was 28 HP at 5500 rpm.
So, long tube headers do provide a benefit, but with mufflers the difference isn't as much as some people think.
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ganshert (03-24-2017)