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Old 07-17-2006, 01:57 PM
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You could try a set of World Sportsman II, The have a 200 cc intake runner, and the 72 cc chamber is availiable. Qutoe from their site:

Quote:
SB Chevrolet Sportsman II Cast Iron Cylinder Heads
Material: High density cast iron
Valve Seats: Integral intake, hardened steel exhaust
Valve Guides: Integral cast iron
Valve Spring Seats: Machined for 1.250/1.550" springs (stepped)
Valve Size: 2.020" x 1.600"
Rocker Arm Studs: Screw-in style (3/8" in Dash-1, 7/16" in Dash-2)
Accessory Flange: Stock locations. 7-bolt universal pattern
Included In Assembly: Manley Street Flo (-1 models), RaceMaster (-2 models) forged stainless steel valves with swirl-polished heads, ring & band-style seals), valve springs, Manley 7 chrome moly retainers, keepers and guide plates
Recommended Installation Items:
Head Gaskets: Fel-Pro #1003 (265-350) - #1004 (400) or equivalent
Pushrods: Requires heat-treated pushrods. Use of 1.6 ratio
rocker arms requires elongation of pushrod holes.
Spark Plugs: Accepts 14mm .460" reach tapered seat 5/8" hex
Champion #670 or #802 - or equivalent)
Intake Gasket: Fel-Pro #1205 or equivalent
Exhaust Gasket: Fel-Pro #1404 or equivalent
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