milling heads for comp ratio increase

nm9stheham said
I put you cam specs in a calculator and worked out what is called DCR.. dynamic compression ratio. It is an indicator of low end torque. The DCR works out to the range of 7.1 or 7.2 depending on exactly what advertised duration one assumes based on the slow ramps on this cam. That is not much different than a stock 318.

No, I don't think this will be a good cam down to 1800 RPM. More likely 2800-3000 RPM. So for me, this would be too big on duration for a good street cam; I think it will be a little bit doggie when you first move out, regardless of how well it is tuned. Not awful with your lightweight ute, but it won't light up the tires when you first push on the throttle. And fuel mileage will be poor with the small LSA.

hell, the prognosis is not looking good. Thanks for doing that calculation. I did think the specs looked a bit radical, more suited to a torquey 360 I would assume. I have a set of Rhoads lifters, the latest type, V-Pro, I wonder how they would improve things...I have done a lot of reading and seen reviews from many users and they are supposed to work well in cases like this, improving low down torque on engines with bigger cams by reducing the lift at low rpms, but bringing it all back at around 3000-3500rpm. A primitive form of variable timing. Duration is the length of time in degrees the valves stay open, and these lifters won't change the duration but they will reduce the amount that the valves will open in the critical lower ranges. They might be worth a try and these ones need to be used with adjustable rocker gear as well.