Hi all and happy new year. I have not gone back to the post that was started by Mart back in mid December and last replied to by me on the 17th because I wanted to do a better job in showing why accessing what your working with be it a factory iron head or a great flowing out of the box race head because your always tied into improving on what the best attributes of the head are and possibly correcting any deficiencies by a good enough amount to make added power, or in the least extend the power band to a range that is better suited to the motors intended usage. I hope to do well enough with this that it can very much be used as general reference . I hope to make this read as short as possible while guaranteeing that the details are understood. Here we go. First and foremost a head with all the flow you could ever want in terms of a NA motor is 100% useless unless that air flow ties into a certain minimum amount of port velocity in fps that is needed to attain the amount of torque needed by a given rpm, and then the rpm where peak hp would be needed to happen. unless your building a motor that will be pressure feed, you just can’t completely have your cake and eat it too. There will aways be compromise. The more you move away from a grocery getter motor that peaks in torque at 2800 rpm and hits peak hp at 4500 rpm, then the more compromises and or changes you will have to make to the rest of the car, no less the motor. This is the same with porting work especially on factory heads . The best way to go for the general enthusiast is to enhance what the head already does best and to optimize that . The good news is that doing this right will allow for some added high lift flow and a Hp gain on top of what may have been picked up from the enhancing work done. This is where I am taking a posting break to draw some things up for reference.
Cool! Maybe those TA aluminums are more on track then, like Steve is explaining? They put a lot of effort into them.
Hope so, my out of the box TA-Rover heads with 1.9/1.6 valves are getting no porting work at all but they will be force fed a little. Maybe around 6psi, maybe a bit less. Jim
