darknessxyz

iTrader: (22)

My friend goin to send out his 241 stock head to a local machine shop for some port work. Since my friend don't know ****, so I've to give the machine shop spec and area to work with. What you guys suggest to be done to the head? It'll goes with a Comp cam 228/232 custom grind.

Here's what I can think of:
3-5 angle valve job
Cut down valve seat?
Smooth out the combustion chamber
Smooth out exhaust inlet and outlet
Enlarge exhaust outlet port to 1 1/2 to 1 5/8 (1 3/4 header used)
Mill down 0.020

Any input is welcome and those head will start working on Monday.

PREDATOR-Z

If the shop doesn't already know what to do, do not use them. Find another shop.

kmracer

iTrader: (1)

yea, seriously. lol. you're ordering a porting SERVICE. dont pay some barney to chew up a set of your heads.

darknessxyz

iTrader: (22)

Don't get me wrong the shop has experience. They just ask me the spec like how much I want to mill and how big I want to open up the exhaust port. They can do anything I want but they're not really a speed shop that do high performance stuff.

That machine shop has been around for over 20yrs. They do crankshaft, head work and build all kinds of engine (From 4 banger to freightliner). So I'm pretty confident with them.

darknessxyz

iTrader: (22)

The shop actually suggested and will perform this:
3-5 angle valve job
Smooth out the combustion chamber
Smooth out exhaust inlet and outlet
Port work done to intake and exhaust port

This is what I ask them to do:
Cut down valve seat
Enlarge exhaust outlet port to 1 1/2 to 1 5/8 (1 3/4 header used)
Mill down 0.020

What else I should tell them to do aside from the above?

Paint_It_Black

iTrader: (1)

I suggest if you don't know what you're doing don't give any advice. Hell, I've been studying port design specificly for over a year now and I'm just now cutting into my own set of heads!

darknessxyz

iTrader: (22)

At least I've to tell them mill the head or not. So any suggest from you after a whole year of study?

PREDATOR-Z

(I smell a )

darknessxyz

iTrader: (22)

Pred you've got PM.

How's that in Dubai? I heard some people hella rich over there.

Paint_It_Black

iTrader: (1)

You can tell them what size CC you want. They should be able to cut it to that. Most of the gain on a light port job is going to be found within the first 2 inches up from the valve. VJ + blend, pocket porting, minor SSR work.. the runners themselves aren't going to limit you until that stuff is taken care of. Of course, going beyond that, make sure the runner walls are straight.. do you want to bias the runner? There are a lot of things to consider when changing a port shape. I mean, do you know what an ideal port shape for the head is? What is going to limit you from creating it? How will that affect your flow? How do you adjust to that? When changing the CSA taper, do you want to raise the roof or lower the floor? or do you want to make the port wider? It's really an art form and it seems every porter is a little different in their approach.

darknessxyz

iTrader: (22)

Thanx for the input, Paint It Black. We (me and the shop) have consider some of the area you mentioned. Then the shop ask me how far I wanna go for that port work. Cuz that'll take alot more time also maybe more $$. That's why I wanna get more ideas. I'll take that into consideration maybe PM you for the info

Quick question, can the exhaust outlet port be open up to 1 1/2 to 1 5/8 to match the 1 3/4 header?

Paint_It_Black

iTrader: (1)

You don't want to port match an exhaust manifold. The exit for the exhaust port should be smaller and fit inside the header primary. That "step" is going to help limit pulses from getting back into the exhaust runner.

Good luck with the build!

darknessxyz

iTrader: (22)

That means port out the exhuast exit to 1 1/2 should be ok, right? The header's primary is 1 3/4, those are Pacesetter Headers.

darknessxyz

iTrader: (22)

Can the same porting theory apply to STOCK 5.3L head? Aside from the smaller intake valve, which I'll replace with stock 2.00 valve, the runner and stuff are the same in 706, 862, 853, 241 casting head. Is that means I can apply the same port work from my friend's 241 head to MY 862 head? Those 5.3L will be next to send to that shop.

c5z28

iTrader: (11)

You tard how much is he paying.
Did you find that lifter yet

darknessxyz

iTrader: (22)

I got hook up on head porting, very good price. PM me if you wanna know details.

Haven't take out that god damn lifter yet, rain ruin our schedule. Also need to wait on the port work. They take like 4 days to finish two head.

c5z28

iTrader: (11)

Failure, at least you have time to drain the oil and coolant before you spread more of it on the driveway.

Prerun4fun13

iTrader: (6)

LOL you better get started on pulling the kmember out that is a BITCH! You've got bigger fish to fry then ported heads lol