Increasing exhaust back pressure via a restriction and the effect on power
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Test engine:
Long rod 4AGE

Modified early bigport head
Kelford 193b 9.2/8.5mm 284/278 @ .3mm
Toda valve springs
Toda inlet cam gear
Redtop bigport block with 10.3:1 smallport pistons
Toda 3.7kg flywheel
Maxpeedingrods connecting rods
Link G4 ecu
47mm itb long runner
Garage4age Header and 3" exhaust