Eibach XT Barrel 2.500 in ID 7.000 in Length Coil-Over Spring - 700 lb/in Spring Rate - Red H76503FL Exhaust port and bolt pattern

Exhaust port and bolt pattern are raised 3/32'' over GM L98 cylinder heads

Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place

684" long pushrod set works perfectly with High Energy or Magnum rockers

Your S550 needs to perform

Manifold height:

Eibach XT Barrel 2.500 in ID 7.000 in Length Coil-Over Spring - 700 lb/in Spring Rate - Red H76503FL Exhaust port and bolt patternEibachs XT Barrel coil springs are designed for the special needs of Circle Track racing, and are configured to provide additional clearance for standard 2. 5 inch circle track racing shocks. Highest Linearity and Guaranteed Consistency Ultra Lightweight for Reduced Unsprung Mass Each Spring Individually Tested Maximum Travel in Combination with Smallest Block HeightsEibach has been committed to creating the finest race springs in the world for over