u can see the huge difference in the first pic, and just by looking at it u can see how its gotta flow more air now... the stock has that ugly lip that is flat and im sure has to cause turbulance. so i ported it by smoothing it out and creating less of a restriction. i was careful not to create a sharp edge... bc air doesnt like sharp edges and actually flows more around curved edges. i hope this helps with flow

do u think this would make a difference? in flow and HP?? maybe extend the RPM range alil?

some body did this before and i followed in his footsteps.

 

Nice job, I would imagine it will help the intake to flow more,,,,

but overall flow depends on your heads

 

yea it didnt take that long and i figured all it could do was help, im looking for 500hp 383

the heads are 195cc patriot performance aluminum heads, spring upgrade and mild porting, partly CNC bowl blending
flow rate
(.4) 223/170 (.5) 252/183 (.6) 263/184 (.7) 270/185

cam is comp cams XFI280 230/236 duration at .050 .567/.571 lift 113 lobe
intake is HSR ported, 58mmTB, 30lb SVO injectors

 

Actually you won't gain much from that porting the only porting you did was make it look better there is still a lot of casting flash in the bends yet that is where most of your gains will come from. Not saying you didn't do a good job though. Btw the cam you chose for your 383 is a good cam ran very well in my friends car the same I'm putting in my car for my 383 but with dart iron eagles 215 cc.

 

u dont think that porting would help? thanks it really only took me about 2 hrs. i wend down into the runners and cleaned up most of the casting flash... didnt really port it all that much, just got rid of the flash. what kind of HP increases/cfm would i see since i did all this lol

yea the cam has alot of duration/lift im hoping its enough for 500hp. your friend/yourself.... what kind of system is he/you running?> cuz im gona need a chip calibrated for this and i dont kno much about tuning.

 

hope u upgraded your fuel pump

 

yea im gettin a walbaro 255lph for xmass and im gona trash that holley stamped crap adjustable regulator for a nice billet unit.

 

Hi,
You need to help the heads as much as you can.
The runners have a dry flow, therefore it should be as smooth as you can.

I did cut a bit more and at the end coated the surface with some enamel paint.
I did stop just above the injector port.

Gasket matching will also help, it is not that you gain more power but it is just that you loose less with these kind of tricks. They are cheap too.

Regards,
Cobra289

 

so your saying that i would be porting more around the head port correct? i went in the runners as much as i could with 150 grit sand paper and its pretty smooth. but i didnt do the middle part of the runners.

i can see from yours that u made runner openings from the plenum with a hard pointy edge.... i heard this was bad since air doenst like to make hard turns, and that a rounded edge flows better. i like how u enameld the inside to get it as smooth as possible, i would be afraid of the paint peeling or chipping tho and going into the engine... so i should smooth out the entire runner and maybe paint inside? wat enamel paint did u use? i heard about the painting trick inside on the underside of the intake and lifter vallley so that the oil doesnt stick to it.... as well as using white enamel paint on the inside underneith of the plenum so that it resists heat better... idk if this is true lol

im going with the 1205 felpro intake gaskets... i heard they are a good match to the patriot 195cc heads. and doesnt the HSR flow 270cfm outa the box? if i get this thing to flow 280cfm that would more than my heads... which would do nothing correct?

 

Hi customblackbird,

Indeed port matching the manifold will help a lot. Every little obstruction there will originate a turbulence in the flow.
The heads determine the gasket to use and the manifold port should have the same size of port.
If the heads are well designed and manufactured you don't need to touch it.

The paint that I did use is one of the little cans of the hobby shops "Humbro" it is used to pain little models of cars or airplanes.
One can would be enough because the enamel paint spread it self very well.

The idea with little porting is to take care that the heads are not chock by the manifold. Every improvement in the air flow path will help, so it is not a matter of comparisons of numbers.

Paint other areas that are in contact with oil or other fluids is a bit tricky.
The paint should be resist the oils under heat.
I know that it is used a red paint to smooth the valley casting roughness to help the oil drain back.
I don't think that paint the manifold bottom will help anything.
Aluminum will absorb the temperature and no matter what you do at the inside will help to reduce it.
If you want to cool down the manifold it should be from the outside.

Regards,
Cobra289