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I believe no 3.9L has had common rail fuel injection; only the 4.5L.
B3.9L=cylinder bore of 4.02 inches and a piston stroke of 4.72 inches
B4.5L is structurally similar to the six-cylinder B6.7 with both sharing a 104 mm (4.1 in) bore and 132 mm (5.2 in) stroke.

I was following where some guy bought many 4.5L engines; wanted to sell them on ebay, but could not figure how to rig the common rail. He asked. He was told to use blue bird bus engine control. Haven't seen where he is selling the B4.5s yet.

Wayne
 

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You pay to read the meat of each of these articles.

I believe no 3.9L has had common rail fuel injection; only the 4.5L.
B3.9L=cylinder bore of 4.02 inches and a piston stroke of 4.72 inches
B4.5L is structurally similar to the six-cylinder B6.7 with both sharing a 104 mm (4.1 in) bore and 132 mm (5.2 in) stroke.

I was following where some guy bought many 4.5L engines; wanted to sell them on ebay, but could not figure how to rig the common rail. He asked. He was told to use blue bird bus engine control. Haven't seen where he is selling the B4.5s yet.

Wayne
The ISB 16v engine is common rail.
 
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