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I cannot start to explain how extremely important it is to match the correct oil pump gear to the correct camshaft gear.  Crow Cams have improved on the original Chrysler design opting for the stronger retaining strength of a three-bolt camshaft and use the "hunting tooth" design gear configuration to improve oil pump gear life and stop camshaft float.  The use of a good quality dual row timing gear set will further reduce camshaft float (the backward and forward movement of the camshaft in the engine block) and eliminate abnormal oil pump/camshaft gear wear.  Stop camshaft float and you get reliability and more power.  More power from accurate spark timing by eliminating timing variations introduced by the camshaft floating backward and forward - resulting in the advancing and retarding of the spark timing for each cylinder.  These tiny timing variations can cause pre ignition, the cylinder head will run hotter and possibly overheat.  Yes, pre ignition that pinging sound you hear when you put load on your engine often caused by too much advance in the timing or using the wrong fuel for your high compression motors if gone unnoticed can cause big damage killing head gaskets and really punishing the pistons and combustion chambers.

When ordering a camshaft you can choose from Crow Cams' listed range of hydraulic or mechanical grinds.  The Crow Cams catalogue is very well set out in table form with a list of camshaft specifications including valve timing, duration, valve lift, RPM range and with special comments.  Also available are performance matched valve train kits with valve lifters, valve springs, spring retainers, valve collets, valve seals, moly pushrods and dual row timing sets.  For those who need to replace their original 6 pack camshaft there is available a reproduction E49 camshaft listed under part number 6703 and you should also get springs to suit under part number 7736-6.

I always recommend you talk to a reliable expert when choosing your engine components and be sure to follow manufacturers instructions and guidelines when using their products. Crow Cams is another Australian supplier and manufacturer of quality performance equipment for the Chrysler hemi 6.

From experience the hemi engines that I have assembled using a factory standard oil pump have always developed a low oil pressure problem at high RPM (a high volume pump will fix this problem) and I have even had oil pump gears come off the drive shaft.  All hemi 6 engines use an oil pump with the drive gear press fitted to the oil pump shaft.  Commonly in hemi 6 engines that see repeated high RPM operation the oil pump gear will twist off the shaft resulting in sudden loss of oil pressure and in some cases a broken camshaft.  I have even tried to solve this particular problem by spot welding the oil pump gear to the top of the shaft once it was pressed on.  This fix didn't last long when the weld failed and put rubbish through the oil system.  Now,  keeping this problem in mind what if you tried to pump a greater volume of oil with the hemi 6 pump and give it plenty of revs.  There is more oil to move and therefore more load put on the oil pump shaft and gear.  The results I could guarantee - a premature oil pump gear failure.&nbbsp; That is exactly the reason why you have never seen a factory hemi 6 oil pump modified for high volume output as it would just never survive.  So how will JP Engineering solve this problem - possibly by having a pressed fit gear that is further held in position by a pin through the gear and oil pump shaft. 

I would like to see this Australian Company succeed in manufacturing a fix for the often ill fated hemi 6 oil pump.  I would like to see both a standard and high volume after market JP Engineering oil pump with an optional oil pressure relief spring kit to increase oil pressure for high performance hemi sixes. 

Our job is to inform JP Performance Products that there will be demand for their hemi 6 oil pumps and their other performance products as well.

Also, I have added the engine specs of my 1991 engine with dyno figures. 
This engine made big horsepower - best 1/4 mile E.T. 13.3 seconds.