Quote: That's why I don't understand why all these head mfg's insist on plugging in the same stone age combustion chamber into a Mopar head.
When the SBC Vortec head came out, Hot Rod did a back to back comparison between a conventional SB head and the new Vortec. IIRC they both flowed similar numbers but the V head had a smaller combustion chamber so compression was up about a 1/2 point.
On the same nothing fancy short block the V head was 70 HP better peak and did it with less than 30 deg of timing. IF you can believe HR Mag.
Trick Flow seems to have figured out it doesn't cost any more to make the right combustion chamber pattern than the wrong one. If this chamber shape works as well as the Vortec one apparently does, they will sell boat loads of them.
Kevin
Every Vortec headed engine I test (mainly '602 crates) best timing for max torque and hp is 32 total. As an aside the overhead and dual plug arrangement and possibly being a tumble port is what contributes most to the G3's lack of timing requirements--not chamber shape in and of itself. J.Rob
