Here is my 383 setup:

Vortech S-trim (pullied for 15psi)
Cola 3.75" crank
Eagle H-Beam 5.7 Rods
JE -31cc Pistons
Oliver Billet Splayed Caps
Bret Bauer Cam
Comp r's
LT's
52mm TB..etc

I was going to use my Ported LT1 Castings (55cc comb. chamber). the heads have 2.00/1.56" valves and flowed 271/187@.550" (dont remember the mids off the top of my head). How much hp/tq could be gained by swapping out my old heads for the AFR standard port heads (not the compettion port ones)? Is it worth the $? Thanks.

Jon

 

I am building a similar setup just a bit more radical and I was steered away from the 220's. It will be a dog on the bottom end. Try some 210's maybe or even a bit smaller possibly.

 

210s are a good match... 220 shouldn't be any problems

 

In all honesty I would talk to Brett about it since he designed your cam.

 

I emailed him and he plugged the AFR's into his computer, but the software spit out the same numbers as the factory heads. He thought it was wierd, but he thinks that maybe the factory castings would work good with this combo. I just dont know if I will step up to a bigger blower down the road, then the heads be a restriction right?

 

I am making over 700 rwhp with stock ported heads. Yeah aftermarkert heads are great and allow for more improvement in the future but I think 700 rwhp with stock ported heads is not to shabby.

 

Damn right dude, 700rwhp on stockers is awesome! The real question is would you gain more hp by slapping on a set of AFR's? Is it worth the cash? I may just hold off and put the money toward a 6 point cage, bmr k member, and Mcleod street twin.

 

I understand you want more power but I would focus on the foundation of your car - Suspension, driveline and Chassis. Remember you can have all the power in the world and still not run a good number at the track.

Ported Aftermarket heads will flow better than stock ported heads.

 

I hear ya, but I'll never run good numbers at the track as long as I still have my 10 bolt. I drive 80 miles one way to the track, so i ride the clutch out of the hole to save the rear. That alone prevents me from getting real good times. If I were to buy the AFR 210/220's, I wouldnt be able to afford to port them. They will be "out of the box" so to speak, so maybe its not even worth it.

 

With a FI car, 220's would do just fine.

Jose

 

I would not bother getting AFR 210/220 if you are not going to get them ported. It basically defeats your purpose of better flowing heads.

 

I'd run ported stockers and use the money you would've spent on a set of 220s for a 12-bolt.

220s would work well w/ that combo. Remember that you'll have to get a little different valvetrain on the 220s than you would w/ 210s as well.

 

I agree.

Rich

 

I need to plant a money tree in my back yard! Looks like I'll hold off.

 

Well I disagree...

The AFRs have a better deck and will not spit gaskets as much... HAving them out of the box they flow in the 275-280cfm area with a good 80cc port that will flow a lot better than a ported stocker...

If out of the box you mean raw casting. then by all means stay with the stockers and port them.

The reality is that porting a set of stockers is around 1500-1600... So i prefer to spend the money on a better casting... The AFR 210s race ready will run you 1900+shipping and it comes ready to bolt on. Granted you need different springs for a HR and probably retainers but you can order them through TEA and have them exchange those parts...

I would order them via TEA. They quoted me to CNC port a 195 lt4s 2300 complete with parts.. which is not that bad really. They guaranteed 290cfms...

I prefer to spend the money now and wait a little longer till i have the car back, but when i have it will be better than the previous choice.