ok Im about to build a ls2 408, I already have a set of 243 heads I was going to get ported with bigger valves which is about $1300. I know the trick flows are way more than that, is it a huge gain in power to get the trick flows?
its a nitrous car

 

Guess it would all depend on who's cnc program your going to run.

 

the 243 heads can use stock GM rockers .with the trick flow head you have 13.5 valve angle for a little better flow .the trick flow head cost $1700 with bronze valve guides ,which work best with after market roller rockers.maybe sell the 243s and get some TSP prc 225 cast heads .

 

which trick flows should I get for a nitrous car?

 

id get the trickflow cnc 235s for your 408 build. i have the cnc 225s on my 383 and just getting around to throwing spray on it. im spraying a 200 shot

 

they wont be too big? I know the 235 are 70 cc?

 

The 70cc has nothing to do with being to big. Its the runner and valve size. Depending on your piston dish or flat top cc well depend if you should mill the 70cc down a bit to achieve your compression ratio that you want

 

I would send my 243s to tea they did a build 408 with tea 243 against all the major name brand heads and only 1-3hp difference.and these heads were all bigger than the stock castings.tfs as cast are not worth the money unless u get extra porting that more$ fully cnc tfs with pm guides are $2600.id stick with the tea 243

 

Tea 243s 2.055 Ls3 valves turned down and 1.59 L92 exhaust valves, milled to 62ccs

 

If you search my threads, I have back to back results from AI 243's to TFS 225's- same dyno and same tuner-

 

Its all depending on your budget as well. If you want to spend the extra grand and also if you want to go roller rockers vs stock rockers. If you spray tho i wouldnt reccomend hollow turned down ls3 valves. Heard of some breaking under forced induction

 

The bump in compression and ported intake counted for hp also not just the heads you put on.what would the results have been with the ai heads more compression and ported intake,I would say 500-510

 

http://www.hotrod.com/techarticles/e...der_head_test/

 

good article, its not worth the 4 or 5 hp for that price, and the 243 are lighter

 

What intake are you using? What rpms are you planning?

 

Its the runner and valve size.

 

fast 92/92, around 6500

 

TEA TFS 235's. I can match a cam and head combo to your specific needs as well as the valve train components for a matched package.

We just came out with our own head and cam package that is truly custom and nothing about each cylinder head is the same due to constraints placed by the camshaft on the cylinder heads and valve train components.

We use only TEA TFS heads in our Head/Cam packages, and for good reason. We will be offering in house Head/Cam packages where we can have Advanced Induction CNC your stock cylinder heads while your car waits on the heads to be finished, but we really don't like messing with drop shipments this way. Unless you purchase brand new castings or allow us to provide new castings.

The little things though are how repeatable results and great performance come together.

 

Dumb question. Do i need a special intake if i use Trick Flows GenX heads which are 13.5* valves? or will a regular LS6 intake work well with it?

 

stock intake will work.