Im building a mid-performance 302 on a fairly tight budget and am looking for cylinder heads. I found these heads for $700 at http://www.powerheads.com./ that supposedly flow 217 @ .5" intake and 174 @ .5" exhaust. My goal is to make around 300hp at the flywheel. Will these heads support that kind of power, or will I just be wasting my money? I dont want a really radical cam so the act that they dont flow much beyond .5' lift isn't that big of a deal. Also does anyone have a cam recommendation that would meet my goal? Thanks for the help.
Dan
that kind of flow will support beyond what you're looking for with the right combination of parts. Edelbrock RPM aluminum heads dont flow much better than that, and we made 440 HP with them out of the box. Good luck
Thanks mavman. For the previously mentioned heads I am thinking of the compcams extreme energy hydrauilic 218/.493 I, 224/.500 E or the same brand but with 224/.509 I and 230/.512 E. I have a C4 with a stock converter and an unfortunate gear ratio of 3:1. I will change the ration eventually but its going to have to wait on funding. Thanks again for any advice you can give me.
217 will support more than 400 horses...easy & simple rule of a thumb....intake flow x 2 = hp potential in a typical street engine with around 10.5 compression.
On 2003-01-31 15:59, ville wrote:
217 will support more than 400 horses...easy & simple rule of a thumb....intake flow x 2 = hp potential in a typical street engine with around 10.5 compression.
I thought I'd let yall and anyone else interested that those numbers are inflated. I found them at www.powerheads.com, adn the were offerering ported heads with the flow numbers listed in my first post for $700. It seemed like a pretty good deal until I found out that those numbers came at 25 inches of water instead of 28 (whatever the hell that means). The end result was that the numbers are up by about 40 cfm over what fordmuscle tested them at. So be careful if you are looking at buying heads frmo them.
Hmmmm... the 28 / 25 means inches of mercury and is used to describe the underpressure the heads are tested with.The higher the underpressure the higher the values should be so what you wrote does not make sense to me.
I am not an expert in testing cyl heads, this is just pure theory.
those 289 heads stock/ported and what size valves??
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