Concept Performance Indianapolis In. LSR-SD1X Aluminum Block 6 Studs Per Head Cylinder 8 Studs 2,3&4 1045 Billet Steel Main Caps 6 Studs 1&3 MHL Lightened Block With Caps 110 lbs Earl Gaerte Cam Profile With Cam Report by Earl was For MHL Midget With Same Bore & Stroke 267.5x.714in273.8x.680ex