1968 firebird 400 a with thumpr cam and 2.5 pypes x pipe and violator mufflers
My 1968 firebird 400 just finished totally rebuilding the motor from block up about a month ago, along with dads fully restored 1933 studebaker rockne which he did about 15 years ago. It was just recently invited to the Concourse DeElegance in Hilton Head S.C.
1968 Pontiac Firebird 400
**The thing is that Im not selling/ & its not mine, 'cause it belonges to a
place down in Houston, Tx that auctiones classic cars. They have all
sorts of cars muscle, exotics, nice classics, and so on. I saw on their
website and thought it would be nice to share it on youtube for my first
10 second 68 Firebird Sacramento Raceway 1987
This 68 Firebird was my first car purchased when I was 17 in 1977. The car
is currently undergoing a frame-off restoration.
At the time this video was taken in 1987 it was powered by a 455 Pontiac
The best ¼ mile performance was an ET of 10.87 and a MPH of 124.83 WITHOUT
the aid Nitrous oxide.
The heads are ported factory cast iron D-Ports cast# 48.
Crankshaft is factory 455
Rods are factory 73/74 455 Super-Duty
Camshaft is a Cam Dynamics solid flat-tappet with .618/.644" lift (1.65
rockers) 265/275 @.050 duration
Advertised duration is 312/322 int/exh
Pistons are Ross flat-tops yielding 12:1 compression ratio with the 69cc
Carburetion is 2 660cfm Holley center squirters mounted on a Doug
Nash/Warrior tunnel-ram manifold.
The differential is a Dana 60 with a 4.10 ratio gear set
1968 Pontiac Firebird 400 Cold Start
My 1968 Pontiac Firebird had been parked up for a week in sub-zero
So, I thought it would be a good idea to crank it over and warm it through
a little. I'd recently had an MSD ignition system and new Edelbrock carb
installed, so was also interested to find out how easy it was to start
The Pontiac was started with no choke. I cranked it over initially just to
make sure everything was free, and to get the oil moving a little, then
popped the bonnet to check the hoses. After that, and with a few pumps of
the pedal, off it went!
The car is a bit of a project, but it's road legal. I'll be doing some more
videos on it soon, so stay tuned.
If you enjoyed the video, please take a second to give it a thumbs up, add
it to a favourites list, or share it. It's always appreciated.
72 402 Chevelle / Pypes X-pipe / Violator Mufflers
One of our customers sent us this video of his '72 402 Chevelle after he
finished installing a Pypes X-pipe and Violator mufflers. He said, "As you
can probably tell, VERY satisfied with the results. Thanks for a great
Thanks for the video and kind words.
Comp Cams Thumpr Cam With Flowmaster 80 Series
New Exhaust and front grills coming
soon!**Cam Information Below**
The newest line of camshafts from Comp Cams is the "Thumpr". This line of
retro-fit hydraulic roller and hydraulic flat tappet cams is designed for
use in engines that originally used a flat tappet cam. It will give a
significant increase in horsepower over an identical
flat tappet grind. The "Thumpr" uses lobe profiles and grind
characteristics that produce an early valve opening, long Exhaust duration, and a generous overlap to give
the engine a powerful and hard hitting Exhaust note and a rough idle without
sacrificing power output or streetability.
RPM Range: 2,000 to 5,800 rpm
Duration @ .050" lift: 227/241 (int/exh)
Valve lift: .479/.465 (int/exh)
Ideal for high performance street use, stock converter ok, best with
2000+ converter and gears, choppy, thumping idle.
Comp Cams 12-600-4
• Muscle car sound is back
• Hard hitting, lumpy idle
• Excellent throttle response and "streetability"
• Significant horsepower increase
and a stock y-pipe with no converter.
some others put into the engine too.
1978 Firebird with Comp Cams Mutha Thumpr
My 1978 firebird with a '68 Pontiac 400, 10.5:1 compression, should be
around 340hp, 400 tq. Has a comp cams Mutha Thumpr with new comp cams
lifters and rockers. The glasspacks are tempory, just needed something to
calm the noise down a little to lash the valves. I put in a th400, has
posi-locker, hedman headers and other things