Blueprint Data
Except as noted, all dimensions are in linear inches. For cam specs, see the separate Camshaft table.
Engine type: Chevrolet Mark IV big V-8
Engine builder: Speed-O-Motive
Measures And Volumes
Advertised displacement: 540 ci
Actual displacement: 540.7 ci
Bore x stroke: 4.50 x 4.25
Compression ratio (GM 049 heads): 9.90:1
Compression ratio (Brodix heads): 10.93:1
Main bearing clearance: 0.0025
Crankshaft thrust clearance: 0.0065
Rod bearing clearance: 0.0022
Rod side clearance: 0.018
Rod center to center: 6.385
Rod/stroke ratio: 1.50:1
Crank centerline to deck: 9.7805
Piston-to-bore clearance: 0.006
Piston compression distance: 1.270
Piston deck height: 0.005 below
Piston dome volume: 10 cc
Head gasket compressed volume: 11.2 cc
Chamber volume (GM 049 heads): 122 cc
Chamber volume (Brodix heads): 109 cc
Piston ring gap, 1st groove: 0.020
Piston ring gap, 2nd groove: 0.022
Piston ring gap, oil groove support rail: 0.015 minimum
Camshaft thrust clearance: 0 (Torrington bearing installed behind cam sprocket)
Piston-to-valve clearance: 0.100-plus
Valvespring seat pressure (Lunati PN 73121): 142 lbs @ 1.940
Valvespring open pressure: 402 lbs @ 1.250
Valvespring coil-bind: 1.130
Critical Tightening Values
Values not listed are the same as production.
With ARP assembly lube:
ARP capscrews in Scat rods: 70 lb-ft
ARP damper bolt: 80 lb-ft
ARP head bolts: 70 lb-ft
Dart main bolts: 105 lb-ft With SAE 30 engine oil
ARP oil pump stud: 65 lb-ft
Rocker studs: 60 lb-ft
...
>>next page