Originally Posted by OneBadGMC
Originally Posted by triniemi
I stayed alive. Could Curtis or any other give me head recommendation for my 509? Looking for most bang for the buck, but also more power. I think aluminum heads alone are going to cut .1 out of my ET if they flow as much as the ported original Merlins. I think they are now with about 320cc intake runner.
Maybe, maybe not. Aluminum heads dissipate heat at a much faster rate. Unless you up the compression, you may not make any more power, and in fact, could make less.
Actually aluminum is a heat sink and it does not give up heat very well at all.Iron dissapates heat better than aluminum.Go fire up two motors,one with iron heads and the other with aluminum,shut them off after they are warm and come back in 10 minutes.You will see which it still hotter.