Job # 1843 (TN) Gen 3 Dodge Viper - Stage Two engine rebuild

This is an engine we had previously built for a turbocharged Viper that was putting down 932HP to the rear wheels. At a recent track event, the owner unfortunately lost a piston at over 180mph. It looks as if at least two of the cylinders were running much too lean, and we have also found damage to four valve seats. After 7,000 miles hard miles, much of it on the track, it is interesting to note the wear in some of the components.

Moving forward, the owner has decided to ditch the blower and have us rebuild the engine as a normally aspirated power plant. The goal is to put down at least 650 ft/lbs of torque.

We have now completed the rebuild of your cylinder heads and the cylinders have been honed to size. We hope to be putting everything together in the next few days.

Cylinders have been honed to size	Head rebuilds have been completed
	Custom camshaft delivered in record time

The following photos show the flow results on the intake side, before and after the valve job and porting. Considering these heads had already been extensively ported the first time around, we think Chris did a great job picking up flow across the board with a peak gain of 16.2 cfm.

The pistons came back from being coated bang on schedule so we should be able to make some great progress next week.

Previously flowed head, before we did the new valve job and porting	Flow increased across the board with a  maximum gain of 16.2 cfm
Thermal coating on the top of the pistons	Moly coating on skirts

We already have the valve job completed and are just waiting for the bearings and pistons to come back from being coated before we can start assembling the short block. Once Chris establishes the new flow numbers (which should be later today) Harold will design the camshaft profile and we will have that made. Despite the fact that these heads have previously been extensively ported, we are hoping to pick up quite a bit of flow on the bench.

Watch this space!

SS 2.040" intakes with Inconel  exhaust valves	JE did a beautiful job with the custom pistons - and made them in 3 days	Pistons made for 11.5:1, NA
Porting in progress	Setting up to measure the flow after the valve job and porting

Harold tearing down the wounded Viper engine	Evidence of inconsistent burn due to fuel and/or timing issues	Super lean...
The piston that gave up the ghost	A number of seats are damaged and show  signs of excessive carbon build up	Timing chain is stretched
More than an inch of play, probably a result of the blower...	Titanium retainers have taken a battering
With the carbon removed, a closer  look at one of the damaged seats	Another damaged seat	A number of the factory seats had moved and all will be replaced
Carrillo rods survived the trauma - all are OK	Oil and water pumps both OK	Block cleaned up fine and will be bored .010" oversized
Crank was unscathed and polished up nicely