We might be going slightly off track here?but I put three HD6s in place of the
HS4s on my tricarb. Also a set of headers at the same time. Made a very
appreciable difference.
Mind you, those original exhaust manifolds are pretty rough old things. Ever
looked inside one?
Simon
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of healeyguy
at aol.com
Sent: 06 March 2017 20:56
To: Healey Forum <healeys at autox.team.net>
Subject: Re: [Healeys] Engine mods - Headers
Listers
Headers can play an important part of an engine build and the design of the
exhaust system does impact the tune of a car, ?but? the use of the car, grocery
getter, daily driver, trailer queen, track or high speed at full throttle
dictates what parts you add and the intended benefit those parts may or may not
give your build. The headers shown in previous posts will flow better than any
stock system. Is it necessary for street cars, probably not. Does it produce
10% more horsepower, maybe. Is that what your after? Maybe the torque curve is
more important?.. There is a long list of things to consider when
contemplating a change from the stock setup.
Aloha
Perry
1955 BN2
10.1 to 1 compression on 90 something octane. (Yes Harriet you can run that
much compression on the street.)
Bench flowed intake and exhaust ports
Larger 100-Six valves
Reshaped combustion chambers in head
1-3/4 carbs
Delta reprofiled cam
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