maticulus
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Everything posted by maticulus
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1986 Pontiac Fiero, along with the 6 speed transmission from the 06 Pontiac G6.
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I stumbled across this forum while searching for some other related info and found this thread. Thought you might be interested in a few pitures of what I did with one of these motors based on the discussion. There are a few others in the Gallery.
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From the album: 3900
The 3900 crankshaft is made of forged steel and has 2.25" crank pins. I had the crank offset ground to a 3.555" stroke for a rounded 4.2L -
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Offset ground crankshaft
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Turbo mock up
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VVT module
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Modified OE manifolds for durability/longevity with the turbo.
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Stock pump is larger than any of the previous 60 degree pumps although you can't see it in the picture.
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DSC01522
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Forged build
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T67 turbo, .81 turbine
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LS1 piston in 3900 block.
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Chevy small block, small journal H-beam connecting rod.
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LS1 Forged piston left vs. stock, right
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3900 Block oil squirters.
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Mild port and polish Intake runner
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New heads
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From the album: 3900
The VVT was disabled by degreeing the reground camshaft in place and blocking the phaser with stops to hold the position. -
From the album: 3900
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From the album: 3900
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From the album: 3900
ARP head studs, Cometic MLS head gaskets. Forged H beam rods LS1 forged pistons 11:1 compression ratio. -
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From the album: 3900
Piston needed to be notched to clear the intake valve, not seen in the picture. -
From the album: 3900
The connecting rod had to be narrowed. The 3500 non VVT and 3500/3900 VVT motors all share a 2.250 crank pin diameter instead of the previous 2.00. -
From the album: 3900
The LS1 and 3900 share the same cylinder bore and approximate compression height, +/- .001 -
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From the album: 3900
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From the album: 3900
New heads, mild port and polish, Manley stainless race valves 1.87/1.52, Comp Cams high performance Beehive springs.
