Watch And Hear To A 400hp Jaguar Inline Six Make A Full Throated Dyno Pull

The 4.2L Jaguar DOHC six engine is a type of nice mills that had a protracted life and nonetheless has legions of followers. The engine was in manufacturing from 1964-1992 a long life that few automotive engines have ever skilled. The 4.2L engine is the “large block” of the Jag inline six household and it’s a devoted block. This engine shouldn’t be primarily based on a 3.8L block that has been bored. As a substitute a brand new block with siamesed bores and unfold bore facilities was used for added energy and sturdiness. Curiously, the manufacturing facility used the identical head from the three.8L engine in addition to the identical cams regardless of the change in bore facilities. Apparently, the distinction was sufficiently small that the extra tightly spaced head didn’t have any points. From the manufacturing facility this was a 260-270hp engine. You might be about to see one making 400hp.

How? We suspect that a lot of the commonplace problem scorching rodding tips are employed right here together with some voodoo magic by the engine builders. This mill belongs to racer Don Norby, was constructed by Predator Efficiency, is being examined by R&R Motorsports, and was filmed by Invoice Terry. That forged of 1000’s obtained to see and listen to this child up shut. There are few finer noises within the motorsports world than an inline six engine with an angle and this one has it in spades. We don’t know what the compression is, what the cam specs are, and what the pinnacle is however when an engine is making 400hp naturally aspirated out of 252di and not using a energy adder, we’re excited about watching it work!

This Jag engine is one imply piece and we hope you dig the dyno video beneath – 

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