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Re: [GMCnet] What has left you stranded on the side of the road [message #239318 is a reply to message #239309] Sun, 09 February 2014 16:03 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
Gary, we took the 365hp 327cu in engines as a starting point. Needed the
283 crank to make the right displacement for the NHRA class that we were
running which was C gas normally aspirated. Started out with a stock GM
fuel injection, then modified the air horn assembly by sawing it in two and
enlarging the port runners and reshaping and matching it to the heads. Lot
of work for almost no gain in HP. Switched to Hilborn injection and vertex
magneto to get away from the cable drive from the distributor to the fuel
injection. Twisted off several drives and never was able to solve that so
the Hilborn replaced it. Once I learned how to tune the Hilborn system it
was a bit easier. Threw away the Duntov 30/30 and had Ed Iskendarian grind
a roller tappet camshaft that he later marketed as the 505 super LeGuerra
cam. All Isky valve gear, including the rev kit that featured the extra
valve springs in the engine valley. Complicated, but no more valve float at
9700 rpm. Boy would that thing honk. 2997 pounds, don't have any idea how
much horsepower it made but it was a lot for the day. Tube chassis with a
39 chev body. 25% engine setback. Door slammer, full cage roll bar, chev 4
speed, Parham Quick Change rear end. No end to the amount of rent money you
could spend on that thing. I never did own a Z-28, but lusted after them.
1969 and then 1970 EPA and Insurance rates through the roof kinda killed
the factory hot rods. But, it is good to remember now and then. Oh, I could
be kinda fuzzy memory wise, but Woody, the parts tech at Capitol Chev
always told me that Chevrolet made some mighty fast trucks well into the
80's. Last time I heard anything about him, he was a NHRA Tech Inspector on
the West Coast. You are right, most of us are long gone now.
Jim Hupy
Salem, OR
78 GMC Royale 403


On Sun, Feb 9, 2014 at 1:26 PM, Kosier <gkosier@roadrunner.com> wrote:

> Jim,
>
> One slight correction. The Z-28 motor was actually the Corvette 365 HP
> 327 with the 283 crank and appropriate pistons. Everything else was
> pretty much the same.
> I was selling parts in the Chevy dealership, so I didn't have any money,
> but I sure did love playing with the racers Oddly, all my friends from
> those days are all gone. Nothing left but memories.
>
> Gary Kosier
> 77 PB w/500 Cad
> Newark, Oh
>
> -----Original Message-----
> From: James Hupy
> Sent: Sunday, February 09, 2014 11:58 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] What has left you stranded on the side of the road
>
> I believe that the original 1976 Camaro was equipped with a 327 cubic inch
> 2 main bearing engine. When you ordered the copo option #Z-28, you got the
> high performance Chev truck 327 with a 283 forged crankshaft, a special
> Duntov cam and liters that were mechanical. .030/.030 lash. Also included
> an aluminum high rise intake, headers, different sized alternator pulley,
> corvette brake parts, heavy duty u joints, The engine block, borrowed from
> the truck division was a special 4 bolt main bearing piece. This
> combination with a stock bore was listed as a 302 cubic inch. I became
> familiar with that combo because that was what we did with our C gasser.
> Engine would rev until something broke. Advertised horsepower was 295 at
> 3200 rpm. If you turned it to 7500 which it would easily do, it made in
> excess of 500 hp. in good race tune. A real factory hot rod for sure. In 68
> they refined it with light weight hood and grill and bumpers, and if you
> had the right connections at the factory, you could get the "special"
> editions that the sports car guys ordered with the quick steering, huge
> brakes, etc. They had special options for the drag racers too. All gone by
> 1969, when the big block cars emerged. Great drag cars, but they would not
> stop or turn like the small block cars. This was the year that Mary asked
> the question, "Do you want to keep racing, or do you want to be married?"
> We stayed married for 50 years. I made the right choice. Both of my
> brothers are at Pomona at the Winternationals. They went over to the dark
> side and race special mustang cobra factory racers. Man those things are
> fast and quick. 156 mph in 8.53 sec. Faster than we went with our C Gasser
> for sure. Long time ago. Still miss it and her too.
> Jim Hupy
> Salem,Or
> 78 GMC Royale 403
> On Feb 9, 2014 8:19 AM, "D C _Mac_ Macdonald" <k2gkk@hotmail.com> wrote:
>
> > Ford has 302, Chev had 305
> >
> > Mac in OKC
> > Money Pit
> >
> > Sent from my iPhone
> >
> > On Feb 9, 2014, at 10:10, "Johnny Bridges" <jhbridges@ymail.com> wrote:
> >
> >
> >
> >
> >
> > ________________________________
> > Was not the Z28 a sales version of the COPO cars coded Z280 which got you
> > (if your name was Donahue) a trans-am racer? All discs, 305 CID
> screamer,
> > bench seats, no insulation, etc. We flew down to Sebring in '68 and
> > watched (I believe) Donahue beat George Follmer in a Mustang. The tunnel
> > port car had substantial power on the Chev, and easily went past it on
> the
> > back straight, but didn't stick nearly as well and lost it back in the
> > crookeds.
> > .
> > . A 1955 Z28?? 1967 seems about the year I remember for the Z28 302 I
> > believe but I'm not a hardcore Chevy guy.
> >
> > --johnny
> > _______________________________________________
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