Bob, when I did the resto on the car, I called Edelbrock tech, and asked it the
F4B should be changed the the Newer Performer RPM.
Surprise, he said that it was an excellent manifold, with a little broader rpm
range, and there was no performance need to change from the F4B. He knew about
Tigers, and said the manifold was a good match, even today.
Funny, he could have sold me on a new manifold, if performance was better, but
no, F4B is good.
There was a tech tip in the last year, where someone had the temp sender hole
filled by alum welding, bored, and rethreaded to the proper thread for the
sender unit. More expensive, but if helicoil doesn't work, this is an
alternative.
Larry
Bob Palmer wrote:
> Andy,
>
> This reply is predictable to those on the List that are familiar with my own
> experience with a bead-blasted intake manifold. Hopefully, you only bead
> blasted the exterior surfaces, otherwise you need to take extreme measures
> to ensure that all the media is removed from the surfaces that contact the
> oil, plus all the air intake passages that also provide a way for the
> abrasive glass media to get into your engine. I might suggest an acid
> treatment, muriatic acid (HCl) as a way to release the tiny chips of glass
> embedded into the aluminum. Better yet would be hydrofluoric acid, followed
> by chromic acid, but you probably don't have access to that. You can get
> some aluminum prep at a paint store though; finishing up with this should
> leave the aluminum with a nice white appearance, although where it matters
> to the engine, you can't see it anyway. (Are you going to polish the top
> surfaces?)
>
> The F4B is a good intake and period too, so having a helicoil installed
> sounds like a good idea, and cheaper than buying a new Performer RPM too.
>
> Bob
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