I got a ported intake from Jordan Musser and I gained about 8 rwhp.

 

Take it to the track, see what it runs. That will tell you if there is something wrong with the car or not.

 

really? you might just end up broke, but it all depends what you consider KUDOS.

 

Just because the owners manual states that the out-of-the-box 195s are designed for a stroker doesn't mean you'll make good power w/them. It's pretty common knowledge that AFRs need a lot of work before they will make good power, not just 'cleaning up'.

 

Listen to the people who are telling you..... correctly..... that the AFR's are no good out of the box. I've seen comparative flow data to support that position.

 

You responded to my first response that the CR is around 10.7:1. What is your DCR? Canton Racer asked some detailed questions that will help us find out your DCR. You should be running 8.5-9:1 DCR to get good power from your package. If you have a SCR of 10.7:1, your DCR may be significantly below the ideal mark.

 

ditto

I think you are leaving a ton on the table with those heads. Honestly my math does not come up with 10.7:1 static with a 70cc chamber and flat top pistons. But I was guessing at a few things.

You're a lot lower from what I can tell....

I have Trick Flow head with a 63cc chamber. I am running a domed piston and a .039 gasket with a deck height of .015. My static is up at 12.5. I'm using a custom SR and DCR is 9.0

The AFR's out of the box are ok... on a 350 or even maybe a mild street 383. a 396 need some serious air and a 195 AFR head with 70cc chambers are not going to fit the combo you have well. They will do OK if you have the rest of the combo right. I think your off in a few places and now the heads look like they are a problem.

I put max effort 220cc TFS heads on a 355 for just that reason. They will out flow and out perform those AFR's any day of the week and twice on sunday...

My suggestion is to double check your math. I think you are wrong on compression and if you are pull the heads and mill them down to get compression up. Or you have to change pistons to use the 70cc chambers and get good compression. I dont think you NEED the heads to be ported to run 400rwhp... but you do NEED to have your combo on the money to do it with those heads. Get the compression up and I think you will stumble across a lot more HP.

You can run a 12.0:1 LT1 93 octane.

 

With a 4.03 bore, 3.875" stroke, .039 head gasket (assuming), 70cc chambers, -5cc pistons and zero deck height (assuming), I come up with a 10.74:1. Granted, I'm filling in a couple blanks here so we need some more specifics.

 

Have you done a compression test and a leakdown on this engine? You may have cam timing issues.


Also tight valves will hold one back, check it.

Even with too small a head, the torque should be MUCH higher.

David

 

Your COMPRESSION is WAY TOO LOW!!!!
The chambers need to be in the MID 50 cc's!

And your comp r lifters are probably broken.
It's what they do.

 

'Fer christ's sake take it to the track or at least G-Tech it (with the newer model). I love the dyno... I try to use them as much as possible, but you have to have some type of asphalt numbers to back them up. I've gone to some dynos and not gotten the results I expected. The track gave a contrary opinion. There are as many variables to dyno testing as at the track.

For best results combine good data logging, PCM tuning, dyno and track (or at least repeatable G-Tech) results. Don't rely on just one. You'll screw yourself.

 

Everyone is Slamming the AFR's195'sStreet porting the ones that are about 1700-1800 dollars. I posted up asking on this site about the parts I chose, found only good reviews and looked at other peoples combos.Yea i have to wait a year since they screwed up my order, and i had to replace all the rubber valve seals with teflon ones last month. in 2002 when i started ths project it was either buy ported stock castings or AFR's ...there was no trick flow. I had to buy new heads any way since the orginals were beat up since #7 piston had pieces missing form it.

.039 compressed head gasket felpro
Leak down test: 3-5% loss of pressure betwen all 8
Compression test: 200-210psi all cylinders
Speak plugs: NGK TR55 platinum, pre gapped (box said not to gap)
Gears: 4.10
TB is opening all the way, when pedal is mashed to floor
had a ported gm LT4 intake before Edelbrock, exact same numbers, GM one would NOT seal.
I need to figure the DCR.....

 

Figured DCR of 9.8 using
http://www.2weird.com/mike/DCR%20wit...n%20motion.xls.

Info used: off yellow cam card from comp
Cam intake Adv. Duration: 290
LSA:112
advance 0
chamber vol: 70cc
gasket: .05 (i stated .039 incorrectly earlier)
piston dish: 5cc
deck height: 0
Bore 4.03
Stroke: 3.875
Rods: 6
intake valve close: 73 ABDC

 

Its 7.84 not 9.8. i messed up andput the intake opening degree(37 BTDC) in stead of intake closing (73 ABDC)

 

7.84 is pretty low. You should be closer to 9:1.