thinking about buying a set of these.. and what is ya'lls opinon on these? they are stock so they have 1.94/1.50 valves.


Also thinking about getting a crank too, and making it a 383 stroker.. I will probably buy a vortec lower intake, and keep my tpi upper intake and take the stock runners off and put on the slp runnners...

Still don't know which cam would be good for this combo?.. any idea's. im looking to make atleast 450 - 550 hp / 550 - 650 ft lb torque!

 

Stock vortecs, factory LT runner design-based intake...~500 hp...not a chance. Not without some serious modifications.

Do a search on Vortec heads.

 

ah, i don't know nothing about these car's, this is basically the first chevy i've owned.. so I don't know what to get for these car's really.. I've owned nothing but mustang's in the past.. i know more about them and making hp then I do these lol

 

So if I just went with a different upper/lower intake i'll be good to go right with the hp im looking for..

btw the vortec heads are 906 casting. don't know what the difference is between 062 & 906

 

Tuned Port Injection TPI is not performance setup, never will be, never has been, and wasn't designed to be. To make horsepower you need a completly different type of system, one that is not designed to make peak power at around 4500rpm and then die. There are several intakes made by lots of manufatures that will support that kind of power.

The 906 and 062 heads are the same. But i would really advise against using them for a performance build. Again they are not performance heads, and never were designed to be. The are just truck heads plain and simple. Thats not to say they can't be made to perform, but all the work and money that is involved to make them decent you could get some much better heads.

 

for ~500 hp, there is a lot more than the intake to think about. at 500 hp or so off the crank, assuming natural aspiration, you begin to lose streetability due to the far more radical cam that is required. But the biggest issue when dealing with that much power is, can the heads flow enough air to feed the engine when the valves are opening and closing that fast? That answer with all stock heads: No. It's not a matter of are the heads good or not. It's a matter of can they flow the air needed to efficiently support the engine. And there are no stock heads, in their stock form, that can support those numbers. Not even the Vortecs. For those amounts of power, you're looking at 200+cc intake runners. I'd say a set of Pro Topline 220s of AFR 195's would be up to the task. They both flow excess of 250 cfm at .500 lift and they flow better as higher lift is encountered. Im not entirely sure on Vortec flow data, but they have 170cc runners, which is a good runner for the street. The flow what, 230ish @ .500 of valve lift? (Someone please correct me if i'm wrong)

Now, you may be saying "well, why can't i just port the h*** out of the heads and make for more runner volume? Because, with that, you kill off their strong point. Velocity. Yes, cfm is important, but so is the velocity that the air is moved through the runners. Sure with strategic porting they can peak out to much more, but with do-it-yourselfers, Don't expect great results by simply "hogging" out the ports. Talk to F-BIRD'88, i know he has done work to Vortec heads and gotten good results.

There are several other issues that need to be addressed with vortec heads. Such as the fact that there is only 1 TPI baseplate that i am aware of tha tis made for Vortec heads (no, they do not share the same runner/bolt pattern as SBC heads). Keep that in mind. Valve springs is another issue. Do a search. Look for all the issues. Vortec heads are a very discussed topic.