Dodge Viper Generation 4 DC Performance HIGH VELOCITY Ported Heads

DC Performance does it again! Over the past year we have been looking very closely at the Gen 4 Viper engine. With superchargers, turbochargers and big engine builds not practical or economical for most customers with this new engine, we were looking for another 100hp without major internal modifications.

The production bottom end on these Gen 4's has proven very stout with good tri-metal bearings, ARP rod bolts and decent rods. The only limiting factor has been the pistons, so we did not want to increase the piston speed or compression. Another big consideration is the sensitive engine computer, the Venom engine controller is very sensitive to mechanical engines changes and we did not want any check engine lights or "limp" in conditions.

Our performance gains with exhaust headers and intake modifications have worked really well, the final step for the 100hp gains would need to be in the heads.

With changes to the VVT, cam and compression not viable options, we focused on the cylinder. There has been quite a bit of technology in cylinder head testing with wet flow benches and injector spray pattern analysis, so we thought a good look at the heads would yield some big power gains.

Our big focus on a head modification was to maximize air-velocity through the primary choke area of the intake and exhaust ports. Engines runs on velocity and not just cfm numbers. The area under the seat is critical and can be improved dramatically. Results were great with a 30rwhp gain. Exchange heads are $2695.00- ARP Head bolts $475.00