JBA PERFORMANCE ENGINES STAGE COMPARISON

Engine Block	Stage 1	Stage 2	Stage 3
Factory seasoned block cleaned, magnafluxed
Superior alloy factory block or aftermarket 4-bolt main block used
Check for cracks
De-burr casting flash to relive stress risers
Oil galleys and all holes drilled and tapped
Bored up to .060, 90 degrees off crankshaft centerline
Torque plate honed for proper ring sealing
Surface decked minimum for proper gasket sealing
Square decked to exact deck height 90 degrees off crank
Align-honed for straightness and specific bearing clearance
Clearanced for stroker rod and crankshaft applications (If Applicable)
ARP hardened head and main bolts
ARP hardened head and main studs
Painted to customer’s requested color
Cylinder Heads	Stage 1	Stage 2	Stage 3
Stock: cleaned & magnafluxed and checked for cracks
Aftermarket: AFR, Edelbrock, Dart, Trick Flow or other popular brand
All bolt holes drilled and tapped
Surfaced for maximum quench & compression
New bronze guide liners installed & sized
Valve guide sized to exact specs
New hardened seats installed (if required)
Performance 3-angle valve job includes top & bottom radius cuts w/ bowl blend
Performance 5-angle valve job includes top & bottom radius cuts w/ bowl blend
Valve is faced, back cut and hand lapped
Mild street port matching
Street performance porting
Gasket matching, runner porting & chamber polish
Intake-to-cylinder head match
Combustion chamber detailed
Mild race porting
Crankshaft	Stage 1	Stage 2	Stage 3
Factory crank cleaned, Magnafluxed, check for cracks
Aftermarket: Callies, Scat, Crower or other popular brand
Checked for straightness (straightened if needed)
Performance balanced
Hi performance internally balanced
Heavy metal added if necessary
Grind and micro polish
Micro-polished
Connecting Rods	Stage 1	Stage 2	Stage 3
Factory rods big and small ends re-sized for specific bearing clearance
Aftermarket: Manley, Scat, Eagle or Crower forged steel connecting rods
Beam ground to relieve stress risers
Weight matched to within .5 grams
Big & small ends checked for specific bearring clearance & pin fit
ARP or other hardened rod bolts
Re-sized if necessary
Engine Assembly	Stage 1	Stage 2	Stage 3
Balanced & Blueprinted
Critical tolerances measured & documented including:
Rod & main bearing clearance, paired rod side clearance
Valve-to-guide clearance and installed height
Spring pressures, cylinder head flow numbers
Piston-to-bore clearance, installed ring gaps, deck height
Piston-to-valve clearance, balance and bob weight
Camshafts degreed and installed
All bearings, gaskets, seals, internal parts measured, documented & assembled
Trial assembled to check clearances on long stroke or rod combos
Assembled and quality control checked
Engines broken in under load using DTS Powermark Dynamometer
Engine tested and tuned for maximum performance