Quote:
Originally Posted by SmirchIs#1
I have around 25 pair of the double or camel hump heads.I really never thought of listing them out here,as I didn't the truck guys would be interested in them.I have five #'s matching Big Block 69'-72' trucks in my junk yard & nobody seems to care about them.As stated earlier in this post,the aluminum heads dissapate heat faster than cast iron,so you can run a little more compression.Keep in mind that is at a trade off of making less power.If an aluminum head is compared to a cast iron head And they are similar in design,the cast head makes more power hands down.The heat retention of the cast head more thoroughly atomizes the incoming fuel charge,thus making more power. No I am not making a comparison between Stock cast iron & more exotic aluminum heads.
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Maybe what smirch is communicating is that you can run more initial advance with lower compression iron heads, that with high compression aluminum heads.
It would make sense to me that the torque in the lower rpm would be more with low compression iron heads.