hey guys ive seen that couple of members on the forums are running these heads, and they all have about 240 rwhp.so i wanned to know if u actually get so much power just from swapping these heads.as much feedback and opions will be welcome

 

I would find it hard to believe that just swapping heads would give you a 100 rwhp gain over stock. I would think you would also need the right cam, intake and exhaust work.

 

well most menbers have a manifold of there choice ,like a edelbrock performer along with an lt1 cam and full exhaust

 

I'd say you could get around 240 to 260 at the crank with the LT1 cam. That should be around 220 to 240 at the wheels. Alot is going to depend on the tune. Since your changing just about every component on the engine alot is going to need changing in the chip to compensate.

 

im already good with the tuning.so it is possible to have that much power to the wheels?

 

I hope you are refering to chip tuning not your every day timing advance and fuel pressure changes. If I'm not mistaken your pretty new on the boards, which means you probably haven't been here quite long enough to pick up on all the chip burning knowledge that your going to need. I'm not trying to instigate, but just make sure you completly understand what your getting into when you swap all these parts on. There are a lot of guys who throw alot of money into their car only to not be able to drive it until they learn the ropes of chip tuning or pay some one big bucks to do it. Ask me how I know. I was a bit nieve when I jumped in, I wish I would have taken smaller steps.

 

Guilty as charged.

I looked at these heads when I was building my new motor and I was told they weren't performance heads. The SR stands for Stock Replacment. So maybe I could see another 20-30 rwhp coming from them if you changed nothing else, and did some minor tuning.

 

They aren't nothing fancy, or high tec. They are a step up from stock heads (non vortec).They do come with screw in studs, guide plates and a higher advertized lift. However, I ran a ZZ4 cam with them and broke a bunch of spring dampers with out going over thier lift specs.

 

well i know they are alot better then the lo3 heads.i dont know how u broke so many parts.i guess some people have bad luck some have good luck.

 

I used to think it all had to do with luck. Then I realized its just metal. No way it's luck there is a reason for everything. My machine shop and scores of other people swore that stock heads wold take .460 lift and I listened and rounded off 3 cams thinking I was doing something wrong, or it was just bad luck. Then I actually measured it my self. I found out that I was touching the valve seals every time the valve opened and it was just a matter of time before I killed a cam. I then had the proper machine work done and broke a spring. Upon closer inspection the inner damper spring wasn't seated all the way down and they broke first then killing my spring. If theres one thing I learned from building engines is that the valvtrain is one place you can get your self in trouble quick if you don't check everything.

As for heads, I think you can find a better head for about the same amount of money. I my self am looking at the 850 dollar pro topline iron lightings. They flow real close to AFR's for 2/3's the price.

 

send me a link to those heads are they 58 cc for a 5.0 engine?

 

http://www.protopline.com/223400080a.htm

Unfortunately they don't have those particular heads in 58cc. I personally wouldn't be concerned with the compression loss. The better flow will more than make up for it. Then you'll have a good set of heads that will work fine on a flat top pistoned 350 when you finnaly step up to a bigger engine.

Check out the flow nubers on these heads and compare them to the ones tested by CHP here, keep in mind that the numbers posted by Protopline are by themselfs. http://www.chevyhiperformance.com/te...598/index.html
You'll see these heads out flow vortecs by 20 cfm across the board and AFR 180's by 10 cfm. At the price of modified vortecs. Summit sells these ready to go fully loaded for .550 lift for 850$.