Quote Originally Posted by 65cayne
454 HO TECH SPECS:
Part Number: 12568774
Engine type: Chevy big-block V-8
Displacement (cu in): 454
Bore x stroke (in): 4.25 x 4.00
Block (P/N 12561353): Cast iron with 4-bolt main caps
Crankshaft (P/N 14096983): Forged steel
Connecting rods (P/N 10198922): Forged steel
Pistons (P/N 10215228): Forged aluminum
Camshaft type (P/N 24502611): Hydraulic roller
Camshaft lift (in): .510 intake / .540 exhaust
Camshaft duration (@.050 in): 211'c1 intake / 230'c1 exhaust
Cylinder heads (P/N 12562920): Iron rectangular port; 118 cc chambers
Valve size (in): 2.19 intake / 1.88 exhaust
Compression ratio: 8.75:1
Rocker arms (P/N 12523976): Stamped steel
Rocker arm ratio: 1.7:1
Water pump (P/N 12484890): Cast iron, long-style
Flexplate (P/N 10185034): 14"
Recommended fuel: 92 octane
Ignition timing: 4'c1 BTDC
Maximum rpm: 5500
GM,is rather limited to the heads they have.
I would think that this combination would work much better with a set of oval 265 cc AFR's or a set of oval 270 cc Brodix heads.
I.M.O.,325 cc heads are way to large for this application.