Porting suggestions/pics for 3x00 heads

[3400-95-Modified]

smoother than mine... Then again I'm not planning on boosting

[IsaacHayes]

Sure is shiny! I can see a casting seam though still in the runner! hehe.

[ForcedFirebird]

Completely finished the first runner, how do you like?







The dowel worked great. Drilled a hole in the end of it and stuck a spherical stone in there. Then cut a slot in the end and wrapped a strip of sand paper to make a paper drum/flapper, then cotton buffed it.

[whitelightnin04MC]

I just use an air regulator to drop the RPM of the die grinder. That way, I can just hold the trigger all the way down rather than trying to feather it.

I didn't need to drop the RPM. My problem was that, with the big bulky trigger, you still had to hold it down all the time and that kind of limited how I could hold the grinder. With the dremel, I just set the speed switch and went to town.

[ForcedFirebird]

Had a few minutes today after moving 2 apartments of furniture for family members. I'm satisfied with the job so far...

[ForcedFirebird]

1 5/8" worked perfect.. although beating the ends into a D shape wasn't the most fun i've ever had.. that's why i used round ports on the last set i built.

Sounds like when I beat a 2.5" pipe to fit my t3 turbo flange. I tacked it, beat it, tacked it, beat it etc etc. Came out nice, though.

Look at the shiney ...






3400-95-modified thanks for the flapper suggestion! I used 80, 120, then a cotton buffing wheel. Probably can skip the 80 on the rest because the stone does a nice job.

I also think I am going to try and use a dowel, dill a hole in the end, and glue a Dremmel bit in it, so I can put in a drill and get the entire runner length as nice as I can.

[Superdave]

1 5/8" worked perfect.. although beating the ends into a D shape wasn't the most fun i've ever had.. that's why i used round ports on the last set i built.

[ikessky]

The dremel was much better for me because there wasn't a bulky trigger that I had to hold down. With the dremel, I just set the rpm and went to work.

I just use an air regulator to drop the RPM of the die grinder. That way, I can just hold the trigger all the way down rather than trying to feather it.

[3400-95-Modified]

The port entrance shouldn't screw anything up if you gasket match. I prefer to leave the floor alone, or just barely go over it to make it look nicer. I can't say any more on this subject.

You have your secrets as you very well should, Bill Gates doesn't release his windows code for the same reason

[ForcedFirebird]

for you, i don't know how much i'd cut out of the exhaust ports. they are pretty large as it is. If i remember right the middle port is offset slightly on the 3500 VS the 3400 gaskets so I adjusted the shape of that one a little.

Why for me? Because I'm going with boost? I know I don't want to loose velocity, but at the same time the turbo is going to need all the gas/heat I can get to it.


Yeah, I saw a little difference betweent the 3400 and 3500 heads when I was comparing the two sets I had here. I thought all three of the 3500 ports looked like they were more vertical, but didn't actually measure it.

Also, I saw you used 1 5/8" primaries? Could they be beat close to the shape of the ports? I think I have some 1 5/8" in the garge, was going to experiment before I spent a bunch of money on 180* mendrels.

[Superdave]

for you, i don't know how much i'd cut out of the exhaust ports. they are pretty large as it is. If i remember right the middle port is offset slightly on the 3500 VS the 3400 gaskets so I adjusted the shape of that one a little.

i used stock Felpro gaskets for a 3400, had to adjust them a little to clear the header flanges but that's easy.


here is the stock 3400 gasket on the 3500 head The far left port is how far I ported them out, the other 2 are stock:

[ForcedFirebird]

And the exhaust? You said, Dave, to port to the 3400 gaskets? I also need velocity on the exhaust side because this motor will be feeding a turbo soon. Where did you get said gaskets?

[Superdave]

yes, just sand the floor lightly. Don't change the short side radius of the port at all.

[ForcedFirebird]

I can't say any more on this subject.

Because you said what you have to, or because you don't want to know your secrets , JK I'll take any advice I can since this is my first port job on a 660.

[SappySE107]

The port entrance shouldn't screw anything up if you gasket match. I prefer to leave the floor alone, or just barely go over it to make it look nicer. I can't say any more on this subject.