Doug,
You raise an interesting question regarding the similarity of the Tiger and
HiPo heads. After looking into this in some detail, I actually don't think
that the stock Tiger 260 heads are comparable to the HiPo 289 heads.
Referring to Bob Mannel's book Mustang & Ford Small Block V8, on page 3-15
he has pictures of the first 289 2V heads introduced in Dec. 1962 and a
comparison with the 221/260 heads intake ports. Referring to the 289 head,
Mannel writes, "This head featured larger valves and larger intake runners
than in the 221/260 heads. Shown in comparison, the 289 intake runner
cross-sectional are measure 1 13/16" x 15/16" (d), whereas the 221/260
runners were 1/4" shorter in height and i/8 narrower in width. (e). Doing
the math, that makes the 221/260 intakes 1 9/16 x 13/16", or 1.563" x 0.812"
versus 1.812" x 0.938" for the 2V 289. The 289's intakes were later further
increased to 1.94" x 1.04". On page 30, Gordon Chittenden's book, gives
diagrams of the Tiger intake and exhaust ports. He shows the intake as 1.61"
x 0.85". Long story short, Tiger 260 heads are much more restrictive than
289's, especially the HiPo and later heads. Incidentally, at page 34 of his
book Monroe writes: "1963 289 heads are the same as the 260, but with the
1.67" and 1.45" valves and 0.3420" and 0.3410" stems. The 260 shared this
head in 1964-1965." I was once confused by the fact that the original heads
on my Tiger had "289" cast in the rocker area, but this apparently explains
it.
Bob Palmer
rpalmer@ucsd.edu
robertpalmer@paulhastings.com
rpalmerbob@adelphia.net
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net]On
Behalf Of Doug & Rett Leithauser
Sent: Saturday, March 08, 2003 6:37 AM
To: Tiger List
Cc: tgifford@dee-inc.com
Subject: 260 cylinder heads
When rebuilding my 260, I reached the conclusion that pretty much ALL of the
aftermarket heads are sized for the bore size & displacement of the 302 and
are really not suitable for a 260. The stock Tiger heads really are not too
bad for feeding the smaller engine, The castings are the same ones as the
289 K motor, per Monroes "how to rebuild small block Fords", and the small
chambers help keep the already low compression up.
Happy Motoring
Doug Leithauser
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