Checking GM 781 Cylinder Head Chamber and Port Volume Street/Strip 454 Big Block Chevy
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- čas přidán 3. 04. 2018
- Part 13 - Checking GM 781 Cylinder Head Chamber and Port Volume
-In Depth Performance Engine Build
620+ Horse Power Street/Strip Pump Gas 454 Big Block Chevy - Auta a dopravní prostředky
my intakes came in at 255 bad port, and 252 good port. c18 74 781 heads. I forgot what my machinist told me he measured my combustion chambers at, but since I'm having the 2.19" intake and 1.88" exhaust valves installed, I did some unshrouding work, and now the combustion chambers are measuring 122cc. I did a port match on a felpro gasket, raised the roofs a little, and ground out the rocker arm stud boss on the bad ports. Now the bad ports are measuring 270cc, and the good ports are 265cc. I haven't touched the exhaust side yet, but I only plan on opening the throats to 85% of the 1.88" valve, and removing all the casting flash.
I think I switched good port and bad ports in my comment.
Great videos! When measuring or comparing port volumes before and after (stock vs. ported/new valves), should you take into account the shape of the valve that will be used? As in, a stock valve might be tulip shaped (less port volume), and a performance valve might be nail head type (more port volume). Or is it not enough of a difference to worry about? Thanks!
leaking valve ?
What happened to the 650hp 454 build?
It exploded on the dyno, so he stopped making the video series!
What do you guys charge for a set of completed 781 heads?
About $4700 complete.
How much would it cost to build a forged 6.2 LSA short block?
$897,256.27!!
with the aluminum options available why would anyone put money into these heads
When your Married with children & have No Money.
@@albundy8052 Sell more shoes Al
@@excelerater
Or YOU can send me some of those Whiz- Bang Aluminum Heads or $3000.
I also need a extra $700. For a tunnel Ram.
I already have short block & two school holley carburetors.
Thanks
@@albundy8052 work hard race hard..good luck
Why wouldn't you is my question? Nothing like old school and learning a thing or two and having some fun while you're at it. If you don't enjoy the finer things in life, then motor on down the highway!
Are you still wasting time on quench chambers, chev shit give,s the V8 world a bad name.