heres a few pics of my top end and one of the intake gasket to intake port on the heads

 

number 2

 

number 3

 

heres the gasket one..
the ports could use some work

 

were do i start?

these ports are really bad...

 

Just get a Sharpie and colour inside the gasket around the outer diameter of the ports. Simple as pie. Then grind away the excess and smooth it down into the ports about an inch or so. Then grind off any remaining high spots.

Really, porting is just smoothing the transitions from one part of the port to the next.

 

First off, you have a motor sitting in your house. I just thought I would point that out. Second, what exactly are the specs on the motor. Is that a carbed LT1 and if so why?

 

that ain't bad. I got an uncleaned block sitting in a closet. Along with a greasy box of pistons and rods.

 

Wow. A carpeted workshop. And I thought I was doing pretty well just to have heat and plenty of light. Doesn't that deep-pile make it a little tough to roll the tool boxes around?

The Bull has you covered. Just make sure everything flows smoothly.

 

OK..... I just gotta ask

What brand/model of heads are those? The chamber looks like Vortecs, but they're aluminum. Are they the E-Tech heads?

What brand of intake manifold? GMPP?

I'm gonna take a shot in the dark, but it looks like an LT1 designed intake manifold with the water pump like that, but the water passages don't.

Not trying to knock ya', just trying to learn. It's very interesting.

 

lmao...you guys crack me up

well its just the heads and intake lol

there vette LT4 heads..and the intake is gmpp...

yes im goin to a carbed LT4 motor..why? because itll be about 1000 bucks more for FI...and i dont have that kinda cash right now...and i got the carb for free

the specs on the heads are 2.02 1.60 valves...and better springs..120 seat pressure 300 open and good to .550 lift

cam is comps 502 grind for lt1 lt4 motors..but on a 110

vader,...yea man my tool box dont like the carpet lol.

i asked baout how much to take off because i dont really want to raise the roof because of the injector "bungs" or whatever the hell there called...i was gonna keep the roof height the same but square it up and match the bottom of the runner aswell as the sides..

thanks for the replies guys./...keep um coming

 

is that all there is to porting? just make the opening bigger and then go in as far as possibe..?

 

No, but thats what some people do. You dont just want to make it better. You want to make it flow smoother around the contours of the heads. Also, if you open up heads to much you can loose velocity and in turn low end torque.

Ben

 

Uh, if its just the heads and intake, what is the water pump attached to in that first pic? lol

 

it's just laying against the heads.

 

yea..i think my mom would kill me if i had the motor in there lol...she saw the pics and said "what the hell is this" lol..

i just wanted to get an idea of what the dude i just spanked will see...

ya know the shock factor of not seeing a thermostat in the intake...make him think wth it is

 

i read today in the book i bought "how to rebuild LT1 and LT4 SBC'S"...and in it it states that the LT1/4 head has a taperd intake port to increase the velocity..

 

Momar,

That is gasket matching and blending. There is obviously much more to porting and polishing a complete set of heads.

It requires a pretty deliberate effort to take this too far and "open up the heads too much."

f-crazy,

If you are serious about getting some extra hp out of your heads follow the link at the end of my sig.

Wishmaster,

Porting and polishing is something that ANYBODY can do at home. It isn't hard. It is just time consuming. But if you have the heart to take on the job, and you don't mind 20 to 30 hrs of fairly meticulous work, you WILL be rewarded with a set of heads that are much better than stock

 

ohh definetly bull...

i was just wondering if and how much i can raise the roof..

now that i think of it... the ports on the intake are smaller then the ports on the heads

 

Well, it is also good practise to open up the intake manifold ports to fit the heads. We are not talking radical amounts of metal being purged here, as I suspect Momar is worried about. Usually it is in the order of 1/8 to 1/16 of an inch, depending on which side of the port needs more to make it a smooth, seamless transition. Then just blending it in slowly as you move an inch or inch-and-a-half deeper into the runner.

Smooth transitions and NO sharp edges sticking out into the air flow is what we are talking about

 

And that's OK.

You don't want the opposite.

When the intake ports are smaller, it can actually help to atomize the fuel, and also limit reversion back into the intake tract.

If the runners on the intake were bigger than those on the heads, bad things would happen. Turbulence and restriction are the first things that come to mind.

BTW, your picture helps A LOT when showing people that you should PORT MATCH, not Gasket Match. :nono: If you were to use the gasket as a guide on how large to make the runners on both the intake manifold and the heads, there would be a HUGE bell-mouth. Not good for consistency to maintain velocity.

 

Porting and polishing is a labor of love. I as a matter of fact just finished my heads at roughly 20 hrs per head. They are brand new out of the box E-tec 170s that are north of 180 now.

I ground down the combustion chambers then fully polished the chambers to a mirror finish, ported and then polished the exhasut runners, and then hogged on the intake runers to incude a gasket match and massive bowl work.

40hrs later the heads turned out just wondefull!!! I cant wait to finish my motor build but still have some porting left to finish on my SDPC base: about 5 hrs or so.

When all is said and done I will have many hours into my porting work alone, the proof will be in the pudding.

Heads: 35-40hrs
SDPC Base: 15-20hrs
Superram Plenum and Runners: 10hrs

 

In my case the gasket and intake manifold runner were a perfect match. All that needed attention was the head intake ports.

His LT4 might not be worth modifying at all. GM might have cast them all very well.

 

Yes, I understand that, but the question was asked if that was all there was to porting a set of heads. I was just stating that it is a bit more involved. I was not trying to say that it isnt something that is increadibly difficult, just that reading up on what can help and what hurts is a good idea if you are going to fully port a set of heads.