I was just pondering this Zenith to SU HS4 conversion I want to do on my
77B and I have a question.
Can I leave the original exhaust header in place and just swap out the
intake and carbs or is the catalytic converter going to be a problem?
That would be really nice if I could do that!
Also, many on the list have said that there will be an appreciable
horsepower increase with the SUs, but a few have also said that there
will be no difference at all except for easier maintenance.
Is there a quantified tru answer?
Hypothetical situation: Stock 77B 18V883Ae motor, Z/S carb, points
ignition changing only carbs and exhuast if necessary.
TIA
Erik.
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