I think we will make some believers in the y block @ speed week.

John, thanks again for getting the heads & intake to Ted in time for Bonneville.

                                               Keith

its not how fast you go, its how you go fast.

                                                   Bill

Bill

Pelham,Al

Here are the dyno results for a 343” Y using a set of Mummert ported aluminum heads.  It’s a 343 incher by lieu of a 3.810” bore and 3.76” stroke.  The compression ratio is 13.25:1 using Diamond popup pistons designed specifically for the aluminum heads.  The camshaft is a symmetrical Isky grind with 263° @ 0.050”, ground on 108° lobe centers, installed at 106½° intake lobe centerline, and 0.592” lift.  The rocker arms are Harland Sharp 1.6:1 roller tipped units assembled on Verne Schumann shafts.  The carburetor is a Holley 780 cfm dbl pmpr which sits atop a 2” tapered carb spacer and a ported Mummert aluminum intake.  Spark plugs are Autolite 3923’s gapped at 0.035” and using a MSD distributor and ignition.  Click the link for the larger version of the dyno sheet.

Link to the dyno sheet

Lorena, Texas (South of Waco)