Gen2 500 have 560 heads bolted onI’ve got to say that all the speculation on the benefit of each part sure makes me think, “If you really want to end up with some solid gains from your motor, just send the car to Carobu to let them do it right.” They’ve already proven that another shop doesn’t give customers a good return on their dollar.
I feel that regular maintenance and repeatable jobs make sense for us to do on our own, but I believe that the experience that Carobu has now will probably make their labor much more efficient at getting the job done.
I feel it’s too bad that we haven’t seen a gen1 motor with the smaller valves go through this ringer yet. The 560 and gen2 500 supposedly have larger valves (and ports), at least the exhaust valves. Right?
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Gen1 heads have same spec exhaust valves as gen2
Gen1 intake valves 44.2mm
Gen2 intake valves 46.2mm
When AMG were working the Gen1 heads before the Gen2 was launched they were basically swapping in 46.2mm intake valves (and new seats to match) and the valves worked and also back-cut to increase flow.
AMG ported the gen1 heads - aka- ported intake bowl to match the larger seats and cleaned up the ports of casting dags/sharp edges etc and tweeked the short radius turn and valve guide/area - the main improvement was in port-matching the heads to the gasket and port matching the intake and port matching the exhaust ports - the usual thing you do when porting matching.
They did tweek the Gen1 intake intake runners and the openings to the plenum chamber.
This was required to match the cams AMG were swapping in.
When MB saw what AMG did they basically copied AMG to release the Gen2 heads and Gen2 intake.
The later version of the Gen1 engine has plenty of torque so the heads were adequate for that engine build and cam
When MB released the Gen2 500 they also swapped cams accordingly (dependant on comp ratio & required emissions of where the car was being exported to)
The 560 heads flow well - they just need the usual tidy up when the heads are being re-furbed but the most important item is port-matching the heads to the gasket and the intake to the gasket so it is all a smooth air-flow minimising turbulence. And same for exhaust ports.
It is still the intake plenum design which lets lets it all down