in the long run i will eventually have the ally top end, will i be wasting money buying the iron head pacesetters ? will they fit the ally heads ?
also if i run the irons at 5-7psi what power can i achieve for modest drivability ?
thanks
Ant

 

The flanges will need to be modified for the aluminum heads. Since there are no aluminum head swap headers available anyway, you'd need to start with some headers meant for the iron heads anyway.

 

Can't really say the gains for 5 or 6psi. Alot else needs to be taken account for. But a iron head stock 3.1 with 6 psI would be sone where arround 180 210 hp tops with a small t3/4 turbo

 

thanks (super)fasteddi. thats all i need :-)

 

I would say at 10psi I am probably in the neighborhood of 250hp give or take. Thats on an iron head 2.8 with a full T3 turbo. So Mark is probably pretty damn close with that number. 190-200 I would say depending on the efficiency(compressor map) of the turbo in question. The tune will have alot to do with it as well.

 

thanks willexoIX. im still trying to think wether to do it with the stock cast exhaust manifolds or get the pacesetters they are ££££ here and if i end up with ally heads at the end then i dont want to waste that ££££

 

If you're going turbo, the Pace Setter headers will be a waste of money, since they are designed for N/A applications and run the exhaust like an N/A application.

You will need to make custom headers, or have someone make them for you, regardless of what heads you use.

 

Hi S-S , it will be supercharged. thanks Ant

 

There will most likely be differences in boost pressures comparing turbocharged to supercharged. Fasteddie, SixShooter and I are all referring to turbos.

Not being too familar with the specifics on superchargers, but going off the same principal, more air in, more air out. You may want large primary headers. I don't know the sizes on the Pacesetters. But you will definitely want free flowing exhaust in any boost application.

 

Ok thanks, sounds like i best just get them !

 

Yea I assumed a turbo application, but if your just supercharging it then get better headers and exhaust in general. For a supercharger, i dont know the HP youll gain or can i even guess at it. Are you going with a M90 supercharger?

 

something like this will be used, its cheap and quite easy to work with and fab parts up, thanks

 

has anyone used obx headers like these, they look like they would need mods i was wondering if the y or under engine joining piece would fit under the 3rdgen or not ?

http://www.ebay.com/itm/OBX-Racing-Exhaust-Manifold-Headers-82-90-Chevy-S10-S15-Blazer-2-8L-V6-2WD-A-T-/191228810846?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c8620165e&vxp=mtr

 

iirc the s10 headers need the rear primary tube on the passengerside moved a lil bit to clear the ac/heater box

 

thanks, yeah i figured there would be a little modding which is fine i was just looking at cheap options .