Info on the following heads

G

Greg

New Member
Hello, I am new here. I would like some info on the following heads they are Pro Comp for a big block chevy, they are aluminum heads 300cc runners with good flow numbers, they have 2.25 intake valves and 1.88 exhaust valves, they have a machine shop and claim to buy the heads bare and build them to there specs. The heads I have looked at was set up for a hydraulic flat tappet can up to .580 lift.
Heads cost 995 $ with free shipping and are complete less the guide plates and studs. You can get them from several places but I liked the ones from http://www.whiteperformance.com since they have the macnine shop and say they have used these alot with no problems.
The flow numbers looked real good and this is what they claim.
Intake Lift Exhaust
74 .100 62
166 .200 118
245 .300 160
308 .400 195
339 .500 229
360 .600 248
374 .700 265
I wanted to no if any of you guys ever ran these heads and what do you think about them. I am planning on them going in a street car with max 10:1 compression, keeping the cam duration around 230 to 235 at .050. I havent decided on a 427, 454 or a 489. The numbers horsepower wise on such a small cam look better on a 427 since the cam is small I guess the cylinders fill better with smaller displacement.
 
Ive seen mixed reviews but like you stated its mostly dependent on the machine shop and components used to build the heads once you start with the bare castings
you might want to keep in mind that a 489 will produce significantly more torque than a 427 even if the peak horse power numbers are similar and a 489 will almost always easily out accelerate a similarly built 427 simply because of the huge difference in the torque curve
you can reasonably figure a 1.1 ft lbs of torque per cubic inch of displacement with either engine once correctly built, so thats about a 60 hp and 60 ft lb torque advantage for the larger engine regardless of what your software dyno might suggest.
yes its true that the 489 willl tend to have a lower peak hp rpm , but theres just so much more useable torque in the larger displacement combo that if the cost is similar I think youll be making a mistake building the smaller 427
 
Don't have any personal experience with Skip White, but I've heard good things about them on another forum.
 
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