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Old 09-04-2012, 12:33 AM   #1
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Default Budget Home Porting

here are some pictures of 643's LT1 heads I'm porting with a drill and a Dremel in a metal shed without electricity run extension cord from pump house. Used dremel a drill and an old porting kit I had from high school. So big $ aren't involved. Heads were $75 + shipping stock valves and springs for now.
I have MS some type of cancer Leukemia? and Rhu Arthritis live in a town where everyone Robs people for all they can get. Getting old and shakey.

Just for laughs or educational purposes here are some home port pics from my cellphone some are blurry. Still finishing intake bowls. The intake bowls and exhaust ports are the biggest restriction and safest for home porters to try to clean up. Blend the valve pocket to the valve seat insert and polish cutter marks out. Exhaust ports clean up around the guides and clean up form to just inside the gaskets on the sides roof do not raise except 1st 1/4 inch of opening floor debur and level remove casting and polish. In the picture I only have rough in on exhaust ports have to do the valve pockets and polish everything.
also have to finish the combustion chamber polish and debur rough edges.
Shaping the guide bosses sucks with my tools so I try to slim and beehive as much as my equipment allows.
Goes faster with the right tools and better eyes and hands. 48hrs so far. 2hr intervals due to fatigue and muscle cramps.

Home Porting Pictures:

http://wumingta.tripod.com/pub/porting1.jpg

http://wumingta.tripod.com/pub/porting2.jpg

http://wumingta.tripod.com/pub/porting3.jpg

http://wumingta.tripod.com/pub/porting4.jpg

http://wumingta.tripod.com/pub/porting5.jpg

Thanks for the help Cocobolo95 I used to work in a computer lab figured out a solution for the pictures on my own.
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Old 09-04-2012, 05:55 AM   #2
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Viper, I am sorry to hear you are sick. I hope you are getting the proper medical treatment to help cure you. Through these forums we meet people with common interests we otherwise might never have met. I will keep you in my prayers for a speedy recovery.

The porting job looks nice, interested to see how they turn out.
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Old 09-04-2012, 06:32 AM   #3
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Natural medicine herbs and such no treatment conventional medicine and hospitals ripped me off and overdose xrays cooked me CT scan etc. Wore out 30yr old dremel and one inexpensive hand drill. Blisters on my hand 3rd degree burns can't feel and respond as normal Multiple sclerosis slows muscles nerves and eyes. Anyhu thanks for comments hows the Hotcam working out?

Did you buy the kit? I bought springs but don't know if I need retainers and cups to get 1.78" installed spring height. Hope to post some better pictures of the ports as I get more done.
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Old 09-04-2012, 07:12 AM   #4
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Good job viper. I too know what it's like to have to work around illness. I have congestive heart failure and too many blood platelets to boot. I can only do things in small doses. I recently rebuilt the front suspension on my 90 camaro dd. It took 19 days for me to do a 2 day job. But I'm like the tortoise that raced the hare. I'm slow but I always get to the finish line.
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Old 09-04-2012, 08:14 AM   #5
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Looks pretty good. In the bowls I would concentrate a little more on the valve guide boss' especially where the flow was the most. You can tell this with used heads because there will be clean spot where the fuel kept it clean. It is best to cc them to make sure they are as equal as possible, especially the combustion chambers. My old heads I took them out around 185 on the intake side. Don't be afraid to flatten out the roof quite a bit. I think it's easier porting used heads because you can see where they flow by the clean areas, that's what you want to focus on the most, where they want to flow not always where you think they flow.
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Old 09-04-2012, 11:48 AM   #6
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Quote:
Originally Posted by Viper View Post
Natural medicine herbs and such no treatment conventional medicine and hospitals ripped me off and overdose xrays cooked me CT scan etc. Wore out 30yr old dremel and one inexpensive hand drill. Blisters on my hand 3rd degree burns can't feel and respond as normal Multiple sclerosis slows muscles nerves and eyes. Anyhu thanks for comments hows the Hotcam working out?

Did you buy the kit? I bought springs but don't know if I need retainers and cups to get 1.78" installed spring height. Hope to post some better pictures of the ports as I get more done.
I broke my Dremel motor and I sent it back to Dremel for repair and they fixed it for free! I am a Dremel customer for life.
The hotcam is working out Great, I'm very happy with it. I didn't buy the kit, just the cam and springs separately. I just installed the valve springs out of the box with the stock spring seats and retainers, didn't check the installed height. The GM instructions say the height works out fine with the recommended components and I read quite a few posts of people using the LT1 retainers with good results.
Chevrolet Performance Parts

I'm kinda planning on going back to the track this fall with some good DA to see what kind of times/mph I get from adding the Elgin rocker arms.
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Old 09-04-2012, 12:36 PM   #7
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That's cool man i wanna learn all that n hope you get get better man keep you in my prayers too

Sent from my SPH-D710 using AutoGuide.Com Free App
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Old 09-05-2012, 01:17 AM   #8
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Replaced my old Dremel with a Black & Decker RTX Rotary tool. Half the cost of Dremel Plenty of power and quality easy to change bits. The Valve guide bosses are good for 3-5cfm. I'm trying to clean up the passages and maintain higher velocity by keeping the ports smaller. Going to let the porting help top end and cam for bottom and midrange. Want a street car with maximum driveability and mileage while maintaining low costs. Trying to get the heads to flow somewhat like early LS1s 230cfm LT1s flow 206-212 intake and 157 exhaust stock. Just polishing (80-120grit intake) is good for 7% improvement in flow. +7% is 220cfm I've cleaned and blended all casting circles and flash out of roofs floors and walls, gasket matched the opening to slow down the flow at the intake to reduce port stall, Cleaned and blended the bowls into the seats and port walls, and behived the guide bosses. Also massaged the roof and pushrod pinch but not to the extent most race porters do.

One thread needs tapped and a broken bolt removed from heads and intake manifold area milled then I can do lap valves or 3 angle valve job clean and install my springs.

Exhaust ports opening up improves top end power.

Cleaning and blending the intake bowls or pockets to the valve seat removes factory machining ridge. This is the biggest blemish in the intake ports. As cast these look lots better stock than the old chevy heads and aluminum is easier to work than cast iron.


Used this as a guide along with David Vizard and Lloyd Elliot information and pictures.

LT1 vs LT4

The roof and pushrod pinch are controversial but areas for improved flow on LT1's my knowledge tells me grinding through the guide boss on the roof adds volume and HP but unless filled with epoxy the hole makes turbulence reducing flow so a smaller faster port biased to the siamesed wall was my choice to widen side opposite pushrod pinch more and just square slightly while maintaining 3/8 to 1/4" thickness at the pushrod pinch curve.


I used a hand drill instead of my die grinders and compressor no power unless use generator in the shed. My old 1/4" carbides are for cast iron and would clog even with ATF fluid dip as cutting oil. Takes me 2hrs to clean up blend and polish 1 intake bowl and blend to port called deep pocket porting. Or is this the term they charge for porting to people with DEEP POCKETS as refered to in college?

The exhaust picture is terrrible I'll see if I can get some better ones soon as the dremel does a nice job on the exhaust ports and intake bowls.

Interested to see the results of the better DA and Elgin 1.6s. I might try rocker arms heads and stock manifolds ported before camming it.

I still say its possible to get high 12's on stock manifolds no ewp and milder 3.23 gears that hookup better on street tires with better MPG. I could be wrong but I've seen it done especially on LT1 Vettes 300hp opposed to 275HP Camaro/Firebirds difference being better exhaust manifolds and duals.

Anyone mod suspension first eg stock car with LCA's what kind of ET reduction or does this pay off only at higher power levels preventing wheel hop breakage etc. Read about a car that hooked up with stock lower control arms but aftermarkets planted the back too well and raised 60ft times.
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Last edited by Viper; 09-07-2012 at 06:44 AM. Reason: Spelling
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Old 09-05-2012, 02:21 PM   #9
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Quote:
Originally Posted by Viper View Post
say its possible to get high 12's on stock manifolds no ewp and milder 3.23 gears that hookup better on street tires with better MPG. I could be wrong but I've seen it done especially on LT1 Vettes 300hp opposed to 275HP Camaro/Firebirds difference being better exhaust manifolds and duals.

Anyone mod suspension first eg stock car with LCA's what kind of ET reduction or does this pay off only at higher power levels preventing wheel hop breakage etc. Read about a car that hooked up with stock lower control arms but aftermarkets planted the back too well and raised 60ft times.
There's a guy on ls1tech called 3DFORMULA that used to run his car stock engine with manifolds with weight reduction and 12 bolt/drag setup and he was running high 12s. His sig pic is of the car at the track with this setup and he's got air under the left front wheel at launch. That's super cool. I believe he's now going LE H/C.
I used to use him as my example to keep the manifolds, But I eventually got headers and I'm never going back.
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Old 09-05-2012, 02:36 PM   #10
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This site has some pretty good cross sections of the ports to give you an idea of how far you can go

Differences between LT1 and LT4
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Old 09-06-2012, 12:08 AM   #11
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here are some articles and pictures I referenced

Home ported and polished stock LT1 flow numbers - LS1TECH

Cylinder Head Porting Mistakes - Engine Masters Magazine


trying to port stock lt1 heads? - Corvette Forum

lloyd elliot lt1 heads pictures - Google Search

AI lt1 heads pictures - Google Search

LT1 vs LT4 vs LS1 stock vs ported head flow

LT1 - LT4 Head Flow Comparison

http://www.popularhotrodding.com/eng...e/viewall.html

This article has tables at the end gives a good idea which parts of porting process gives the most benefits

http://www.popularhotrodding.com/eng...g/viewall.html

the results tables suggest best gains in intake port runners are working the roof of the port and widening the pushrod pinch.

Deep pocket porting shaping the guide and cleaning up combustion chambers are big flow improvers these are closest to the combustion chamber and provide most results for time and effort.

http://www.highperformancepontiac.co.../photo_24.html

Exhaust side Bowl blend and or deep pocket port and clean up guide boss Provide more results for time spent porting. These are the first things in the flow path.
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Old 09-06-2012, 12:50 AM   #12
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Comment or thoughts we port in a Laboratory ish environment. Wonder what a wet flowbench provides because air and fuel mixture flow in reality. Also what does a set of heads flow after running 5000 miles now have carbon on exhaust ports and fuel deposits on intake runners this real world conditions must affect performance but how much? Unless debured and polished the combustion chamber carbons up around both valves flow path so they cannot flow the dry numbers tested on a superflow bench with cleaned and tweaked heads. And its a fact that some unscrupulous people fake the flow test results to sell product Ebay.

There are lots of tricks to improve flow numbers on the bench and sometimes only the best cylinders ports are flow tested. But what works we have to test in our cars at the track or on the freeway onramp not a flowbench or dyno.
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Old 09-06-2012, 08:04 AM   #13
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That's true, mine were never flowed on a bench but were proven at the track. I can tell you that even though you polish combustion chamber and exhaust port carbon still builds up.
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Old 09-07-2012, 12:54 AM   #14
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I finished the intakes today and have some better exhaust port photographs. Rough in done on all exhaust ports and rough grit debur. One complete exhaust port pictures and bowl work started. Injured hip and back went to sit down no stool there landed on concrete on hip back hit weight bench and metal scales. Cussing had to drink a beer to relax. Irony just commented on factory back cut on exhaust valves then I received a cut on my back.

I was going to polish the exhaust completely but now like you said MB carbon buildup so 120 grit then 240 on chambers.

http://wumingta.tripod.com/pub/porting6.jpg

http://wumingta.tripod.com/pub/porting7.jpg

http://wumingta.tripod.com/pub/porting8.jpg

http://wumingta.tripod.com/pub/porting9.jpg

http://wumingta.tripod.com/pub/porting10.jpg

http://wumingta.tripod.com/pub/porting11.jpg

http://wumingta.tripod.com/pub/porting12.jpg

http://wumingta.tripod.com/pub/porting13.jpg

http://wumingta.tripod.com/pub/porting14.jpg

http://wumingta.tripod.com/pub/porting15.jpg

http://wumingta.tripod.com/pub/porting16.jpg
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Old 09-07-2012, 08:13 AM   #15
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There's still a lot of meat left to be taken off if you want too?
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