Checking GM 781 Cylinder Head Chamber and Port Volume Street/Strip 454 Big Block Chevy

[@CLC496]

What happened to the 650hp 454 build?

[@Anarchy-Is-Liberty]

It exploded on the dyno, so he stopped making the video series!

[@rong4189]

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!

[@jasonevers3138]

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.

[@jasonevers3138]

I think I switched good port and bad ports in my comment.

[@ashteregg2133]

leaking valve ?

[@carpathian677]

How much would it cost to build a forged 6.2 LSA short block?

[@Anarchy-Is-Liberty]

$897,256.27!!

[@jamiegearhart2194]

What do you guys charge for a set of completed 781 heads?

[@Anarchy-Is-Liberty]

About $4700 complete.

[@michaelgiglio1571]

Are you still wasting time on quench chambers, chev shit give,s the V8 world a bad name.

[@excelerater]

with the aluminum options available why would anyone put money into these heads

[@albundy8052]

When your Married with children & have No Money.

[@excelerater]

@@albundy8052 Sell more shoes Al

[@albundy8052]

@@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

[@excelerater]

@@albundy8052 work hard race hard..good luck

[@Anarchy-Is-Liberty]

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!