Gentlemen:
I've been reading with interest all the talk about swapping 289 heads onto
260 blocks to get more H.P. It seems to me the context of use of this power
needs to be discussed.
As I understand it, and generally, do not larger valves and ports provide
the path to more horsepower at higher rpm? seems to me this would be OK if
you are seeking performance gains for drag racing, auto crossing, etc.
But if your goal is to smoke past the doddlers on the h'way without a lot of
sturm und drang, torque at more civilized (lower) rpm is what you need.
So in this case, would just bolting on a set of 289 heads be likely to
provide that mid-range boost that you are looking for?
???
Dave
----- Original Message -----
From: "Ron Fraser" <rfraser@bluefrog.com>
To: "'A. C. Tynes'" <v8tracker@gmail.com>; "'kevin beck'"
<kevinteresa.beck74@gmail.com>; <tigers@autox.team.net>
Sent: Thursday, September 10, 2009 9:09 AM
Subject: Re: [Tigers] 289 heads
> Kevin
> A.C. is correct; you need to be aware of the different head
> configurations.
>
> Generally the 289 heads with larger valves and larger ports will give you
> more HP. You also need to use a 289 intake manifold because it also has
> larger ports. The 260 intake manifold has smaller ports but would still
> give you some increase in HP but generally less than the 289 manifold.
>
> The C3AE-F 289 heads are the only ones with the smaller valves, same as
> 260
> heads, I believe but should still give a HP increase due to the larger
> ports.
>
> The following 289 heads should all have the larger valves and the same
> size
> combustion chamber:
> C4AE-C, C5AE-B, C6OE-M, C4OE-B, C5AE-E, C5OE-A, C7ZE-A
>
> Ron Fraser
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