Speedmaster, Edelbrock, ProMax head question for you guys
Which head would you go with and why?
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The Liberty valve for me is the no brainer for sure for the following reasons;
These are street replacement HP head and even when ported, they’re limited in port volume and area. While, yes it is true you can lay down some really good time slips, they’re still used largely in part on street or street strip vehicles rather than race only cars for the reasons listed above.
2; Getting a cam above .600 lift is normally a race cam lift. Getting a higher lift is easy enough, true, but coupled with a more street duration isn’t as easy. .600 is enough lift coupled with the flow numbers to produce a really good mean machine in the street or a good track only car. This is the focus of the head at its best.
The Liberty valve produces a better fatter curve. IMO, it will our power the Ferra valves head in the applications the head is best suited for and most, if not 99% of the camshafts available on the shelf where most people purchase instead of a custom grind.
While you yourself have a quick car with these heads, your more so the exception to the rule and not what most people do.
The chances of myself getting a cam to take advantage of what I would call extreme lifts normally associated with Chryslers is pretty much not going to happen.
I would normally say that if I’m going to have a race car only and the cylinder head has its peak flow above .600, it’s not going to be a knock off head but a superior head to start with over the ported version of what is shown, or close to it. The W9 & Victor heads come to mind for the ability to have a higher ceiling for port flow.
Now I know there can be a lot of hub bub smack talk on what other people do with other and often a lesser cylinder head like a OEM 308 or 302. I don’t care to go that route myself. I know what can be and have seen what is done and it’s how they get there that doesn’t do it for me in a street or street strip ride.
Race only is a different story.
