Image by cody polage; cool flashpics

12:1 Compression 351 Winsor

AFR heads

This engine is in a 1966 Mustang. It's a back half car running with a C4 transmission with a Trans brake. During rebuild signs of detonation were found, he had been running C12 racing fuel. 

Modifications were limited to the grooves and the quench clearance opened to 0.070". Initial testing at the track was stopped because of violent wheel standing. Chassis modifications are being done to allow further testing. 

First thoughts are the grooves combined with the wider squish clearance eliminated a detonation problem at the launch. The torque resulted in the violent wheel standing.  When the wheel standing problem is corrected, testing will continue….