After reading some of my back issues I came across the goodwrech quest story and like the 142 supercharger, ws thinking of adding one to a 290 HP crate moter since it allready has a cam ground for 114* LSA.  This engine in my little Chevy II gasser sedan (it is about 2500#)should  be allot of fun, or am I putting lip stick on a pig???
Thanks  

Almost no matter the size of the ports and how restrictive the induction system is pressurizing it will usually reap some gains. So, the gains will be there, will it be worth it? Maybe...  

According to Holley they suggest "stock" type heads because if "hi flowing" ie 200 CC heads are used it will drop the boost and there for add little power.  I know next to nothing about superchargers so I do not know quite what to believe  

I'm sure that the system must be sized according to the supercharger's capacity but you have to remember that boost is heat not necessarily power. Especially with a roots blower that does not have a very effective way of ridding an engine of that heat...

But this is probably splitting hairs, the difference between a 200cc port and a 180cc port with the same sized valves and same valve angles/locations would probably be almost negligible in terms of supercharging.  

this is the supercharge I plan on using.  so upgrade to a 180cc head like a RPM or trick flow?  Holly said since this is a small ci supercharge it has to spin really fast to make boost, and not to run it any faster than 5500 and no more than 6 lbs boost. I read a article some time back that said sotck heads will make gobs more torque below 4000 than aftermarket heads will, but above 4000 and the aftermarket heads all the way.  

It's true that increasing breathing capacity takes from the bottom of the rev range and adds to the top but there is a fine line between making good low-end power and being restrictive...

Torque is volumetric efficiency (ideally peak VE% should occur at peak torque) so the cylinder heads have to be able to feed the cylinder to its demands (at whatever piston speed that may be) but also have a high enough port velocity to keep power below peak torque more 'intact.'

What I'm saying is don't expect your 160cc stock heads to make much more power at 3500 rpm than a good aftermarket head, it just doesn't work that way.

Some people look at the fact that supercharging regains the torque production that a larger induction system can reduce. By pressurizing the intake tract you do a much better job of ensuring that a large quantity of charge will make its way into the cylinder even at speeds that one wouldn't think would be included in the engine's RPM range.  

Looking back and reading what I wrote I was mistaken when I said that it would lower boost it was velocity that it lower not boost My question is will a 142 ci blower keep up with a set of big heads?  Remember max rpm for this engine would be 5500rpm?  if then what would be a good det of heads for this engine be?  

I say you build this engine nearly the same as you would for a naturally aspirated build and let a few pounds of boost help you out...

I say any good, high quality 170-180cc port cylinder head will do. Edelbrock, AFR, Dart, etcetera are the places to look but you probably already knew that.  

I have the same crate motor that I want to put in my 55 post car.I also want to put that supercharger on I think it is good for 100 horse power and probably would be no no drive ability problems for a street driver.The only thing I'm not sure about is vacuum for power brakes and carb tuning issues.  

I agree with GibTG, either head will work, GM or aftermarket. If you go with the larger flowing head your power band will change to make more at the upper rpm's. We took a 350 chevy with steel crank, world sportsman heads with 202 valves, BM small blower, added a holley pro-jection fuel injection on it with mild cam and put it in a toyota 4x4 lifted 6". It ate all 454 SS trucks, vettes and just about anything on the road with 33" mud tires on it! The port size is not critical with a blower as the smaller it is, the velocity of forced air will be greater. You just need to decide what rpm range you want to spin it to. Also, you won't have a vacuum issue either unless your cam is over about 550 lift on the intake side with a big duration. Hope this helps.