Gary,
I believe fitting the stock TR4-A cast iron exhaust manifold to a TR3 frame=
requires using the 2-piece; 'Y collector' with the seperately available 'e=
xtension pipe' (Moss has them), VERSUS the standard 1-piece stock TR4A Y co=
llector with already welded-on extension pipe. The separated version lets y=
ou get the piping through the more restrictive TR3/4 frame easier. =
The TR4-A exhaust manifold COMBINED with the late TR4 'gas-flowed' intake m=
anifold, plus the stock TR4-A camshaft and carburettors, gives you that ext=
ra 4 horsepower that the Triumph factory boasted about around 1965. =
So, if you're keeping the original restrictive TR3 intake, and the original=
TR3 cam and carbs, the improved TR4-A exhaust manifold, or even headers, m=
ay not make noticeable improvement in power.
Regards,
Carl
'63 TR4 since '74
Anyway I'd like the later tr-4 manifold with the two separate pipes if=A0
possible. Are there any used ones available. Another possibility is going w=
ith=A0
headers although cost is a strong consideration here. I'd go with an earlie=
r=A0
header (i have the high port head) also if available.
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