I agree with all that Bob says except that the pre-64 Pontiac V8's used
a very different water pump (early 4 bolt vs. later 8 bolt) and coolant
distribution system (early output from the water pump went via hoses to
inlets on the heads vs. later that pumped directly into the front of the
block). If you are trying to keep it stock looking anyone with an eye
for Pontiac V8s would know the difference.
If you are not sticking to totally stock, the later V8 with TH350 or 400
would be a good idea. Overhauling a dual-range Hydra-Matic would break
most Enron employee's 401K plan. Rebuilt TH350s are cheap. Given that
the Napco probably has 4.56 gears you may want to consider a
transmission with an overdrive high gear.
But then I'm perfectly happy with my 57 347" V8 with Hydra-Matic and
3.08 rear gear.
-----Original Message-----
From: Robert.Heil@hellausa.com [mailto:Robert.Heil@hellausa.com]
Sent: Wednesday, March 06, 2002 11:26 AM
To: mark@noakes.com
Cc: napco4x4@yahoogroups.com; oletrucks@autox.team.net;
owner-oletrucks@autox.team.net
Subject: Re: [oletrucks] 336 V8 and Hydramatic
Instead of a 336, why not use a Pontiac 347 or better yet a 389 or 400
or
421 or 428 or 455? Especially with the 389 or larger bore versions,
your
torque ratings increase significantly, and are identical dimensionally
to
the small bore small valve V-8 Pontiac engine that came in your truck
originally. No one could tell by looking, unless they read the head
casting number.
As for the transmission, you are going to need a short-tail 400
Hydramatic
out of any GTO, Cutlass, or Skylark from 1968 - 1972 or any 400 Firebird
from '68 thru 1978. Rusty GTO's can be had for peanuts compared to what
you might pay for these parts individually.
Bob Heil
'51 3600 in pieces
mark@noakes.com
Sent by: To:
napco4x4@yahoogroups.com,
owner-oletrucks@auto oletrucks@autox.team.net
x.team.net cc:
Subject: [oletrucks]
336 V8 and Hydramatic
03/05/02 07:29 PM
Please respond to
mark
To NAPCO and ole-trucks lists:
I have previously mentioned to the NAPCO list that I just picked up a 58
GMC 1/2 ton
NAPCO, big back window cab, fleetside, with 6 cylinder, 3 speed manual,
and
original
power steering.
I would like to consider converting this truck to an original 336 V8 and
Hydramatic
transmission, keeping the NAPCO and power steering, of course.
So I need to find a good 336 V8...anyone have one that they want to get
rid
of?
And I'd like to pick up a Hydramatic. My brother Brian has a spare for
his
57 Cameo
(265 V8), and what I'm thinking is that we would pick up another
Hydramatic
and have one
spare between us.
Are there any differences between the GMC Hydramatic and the Chevy
Hydramatic that would
make this not work (other than the bell housing)?
Anyone have a spare Hydramatic that they want to get rid of? I already
have all the
linkage, column shifter, etc. Just need the trans.
I'd prefer the the southeast as trying to go get one further out than
that
can be a
problem (shipping or travel to get it).
Thanks,
Mark Noakes
58/56 Chevy Suburban
58 GMC 1/2 ton NAPCO
59 GMC Suburban basket case
Knoxville, TN
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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