Chris, ORGER ENGINES in Scorsby Road Bayswater should be able to do it.
Everyone knows of them, as when I tell people they say, "oh the joint opposite the Adult shop ":o
Cheers,
Mario
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These will help too
Accessories | JE Engineering
Any engine reconditioning service should be able to do it for you
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Hey mate I'm in Perth but can't help on where to get the labor done as I did my manifold myself and it's a fairly easy job to do as mine was the same as your squeaking at higher rpm...
mines been on for nearly a year now and drive it daily aswell as use it for towing quite abit what I ended up doing was souced a second hand warped manifold got it faced by a machine shop dewebbed and enlarged the 8 out side stud holes and then had it ceramic coated inside and out so far so good. For me the ceramic coating was the most expensive part of the job but think its well worth it.