The 407 cui Numbers-Matching Vari-Lift Engine (2017 – Present)
Specs:
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Mileage after rebuild (2017 - present): 31,000 km (19,262 mi)
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Engine Block: original Pontiac 350 cu in matching numbers
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Bore: 3.905 inch
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Stroke: 4.25 inch (stroker kit Butler)
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Displacement: 407 cu in
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Compression ratio: 9.2:1
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Rods: Eagle ESP forged H-Beam 6.8 inch center to center with full floating pins
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Piston: Ross flat top
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Piston rings: Mahle
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Crank: Eagle 4.25 stroke
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Bearings: King Bearings
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Heads: Factory Heads casting # 94 with 96cc combustion chamber volume
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Intake Manifold: Pontiac four barrel # 481783
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Carburetor: Rochester Quadrajet 7040263
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Head gasket: Cometic multi-layer steel 0.027"
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Camshaft: Comp Cams hydr. roller 51-413-11 duration int. / exh. 264° / 270°
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Lifter: Comp Cams hydr. roller lifter CCA 85701-16 (modified to solid lifters)
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Rocker arms: Vari-Lift rocker system according U.S. Pat. 7,171,930
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Timing chain: Comp Cams # 174
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Flywheel: Hays
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Clutch: Summit racing
The Numbers-Matching Engine Block Used for the Vari-Lift Engine
Original numbers matching block with 350 cui displacement
Serial number and block code (WU = engine combinated with manual transmission)
VIN number corresponding to the car
Production date: Feb. 19th 1971 night production
B = February
19 = 19th day
1 = first digit of 1971
Built-In Components
Clearances for large valves (this is a remnant of the 1969 350 HO block, which was equipped with cylinder heads 48, which had 2.11 intake valves and 1.77 exhaust valves)
Bore: 4.905 inch
The block was bored and honed using a torque plate
Connecting rods:
ESB H-Beam
center to center 6.8"
full floating pin
Pistons: Ross flat top with
full floating pins
Piston rings: Mahle
*Compression ratio: 9.2:1
(*= in combination with 96ccm combustion chamber and 0.027 head gasket)
Crankshaft: Eagle with 4.25" stroke
Crank seal: Thin indian viton
Bearings: King SI series (K-788)
Cylinder Head: Casting # 94
Springs: Comp Cam Beehive
Valves: OEM replacement (new)
Valve Guides: custom made
Valve Seats: 3 angle cut
Head gasket: Cometic multi layer steel gasket 0.027" thick
Intake manifold gasket: Cometic .060" HTS
Camshaft: Comp Cams hydr. roller camshaft 51-413-11
duration int. / exh. 264° / 270°
*Valve Lift int. / exh. 0.487 / 0.495
(* = with rocker ratio 1.5)
Lobe separation 110°
Lifter: Comp Cams hydr. roller lifter
CCA 85701-16 modified to solid lifters
Rockers: Comp Cams CCA-1451-16 steel roller tip style
Valve springs: Beehive CCA-26995-16
Retainers: CCA-787-16
Timing chain: Comp Cams # 174
Flywheel: Hays
Clutch kit: McLeod MCL-75021
Note: This "performance clutch" was not able to handle the torque of the engine. It was replaced later by an Summit clutch kit SUM-700808.
Original intake manifold with the original 2bbl Rochester carburetor
July 2017: Assembled engine ready for installation
The Built-In Vari-Lift Rocker System
Video: The installation of the Vari-Lift rocker system on the factory cylinder head casting # 94
