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That is certainly stepping it up for the Poncho. Most likely will be the highest powered OHC in the land.


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Originally Posted By: tlowe #1716
That is certainly stepping it up for the Poncho. Most likely will be the highest powered OHC in the land.


I just noticed the website says both your 6" rods and flat top pistons are sold out. Is there an ETA on more coming into stock? Summit carries the rod, but not the piston. And could the piston be ordered in .030" overbore? Its been a while so I need to re-check but I think my good block is standard bore. I was thinking of placing an order in November.

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They are on order, did not want people ordering rods without pistons sitting on the shelf. Probably less than 2 weeks to my door.

I always order my stock pistons in .040 or .060.

Can special order any size, they will just cost a bit more because of less quantity.

Just send me a email tom@12bolt.com


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I'll send an e-mail when I verify the cylinder bore. I don't have much issue spending a few dollars more for a little thicker cylinder wall.

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Tom! Did you ever decide if you could sell me four of the H-beam rods and for how much?


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Originally Posted By: TheSilverBuick
I'll send an e-mail when I verify the cylinder bore. I don't have much issue spending a few dollars more for a little thicker cylinder wall.



I don't think the Poncho's have the same wear issues with the front couple of cylinders like the Chevy's do, so you may find your blocks clean up easily at .030" over.



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I'm not sure if they do or not. I'd have to dig up the sonic check I did on my "good" block.

And good news, the intake showed up to Smithberg Racing today!

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Got all my OHC L6's home. One more storage shed to assemble and storage unit to empty before everything is home.

Pontiac OHC corner.
[img]https://scontent-atl3-1.xx.fbcdn.net/v/t...amp;oe=5A707E44[/img]

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The cylinder head, throttle body and valves have reached Nick in good order. Officially in the queue.

http://www.smithbergracing.com/

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Getting some work done! At Nick's recommendation I ordered a performance intake/exhaust gasket from Clifford to get some more port size. He's got it marked out and starting the rough port work.

The gasket ports scribed out.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5AAFEEC1

It squares up the exhaust ports on the end. I'll have match up my header flange, but that isn't a big deal since I haven't done final welding on the header flange.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5A8DA0A6

Roughed in.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5A98B6A3


Unfortunately the valves I had are not for this head. Thought they were, but are not =/ So that's going to be an extra few hundred dollars for new valves.

Last edited by TheSilverBuick; 11/19/17 02:23 AM.
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I do a similar lead-in on a mill on my heads. But If I were to go straight in at 90* like you show I would hit water on my crummy old Ford junk, so I angle my mill head at 15* so as to gently taper it toward the rough port casting wall and minimize the possibility of too thin walls in the roof of the ports.


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Hot off the presses. All I can do is show pictures, I trust Nick is doing the right things. I did provide him with pictures of a sectioned head and he did mention before he started about sonic checking the thickness of the port walls. I told him if he wanted to do any fancy tricks like angle milling, etc, I was okay with it, especially since he has the intake too. I'm looking forward to seeing if he doesn't anything different with the chamber shape than I did (other than higher quality work).

Before any work is done on the valve side of the intake port.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5A8C9D4C

A rough cut.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5A9CF113

A very cleaned up port compared to a rough cut port.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5AAC0DCD

A closer picture of the intake port.
https://scontent-sjc2-1.xx.fbcdn.net/v/t...amp;oe=5AA5F10A

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You may want to get hold of http://www.blackopelracing.com/

they have a number of rare OHC pontiac parts left over before they swapped in the 4200.


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When I talked to them on the salt a couple years ago it sounded like they had gotten rid of it all.

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Oooh, thanks for the port porn! Pretty work.

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All the port work is pretty much done. Going for final flow testing and maybe a few tweaks to the chamber or such, but on to ordering some valves, springs and retainers.

The difference in the ports! Glad I didn't finish my turbo header yet, I'll need to grind out some material to match up.
https://scontent-lax3-2.xx.fbcdn.net/v/t...amp;oe=5AA4F729

This was a head I did in my garage.
https://scontent-lax3-2.xx.fbcdn.net/v/t...amp;oe=5A8C8107

Intake.
https://scontent-lax3-2.xx.fbcdn.net/v/t...amp;oe=5A9C2FCE

Exhaust.
https://scontent-lax3-2.xx.fbcdn.net/v/t...amp;oe=5AAD03BE

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Ran into an issue with the port work. The intake ports weren't wide enough to match up to the head! In fairness CNC-Dude Scott doesn't have a OHC head to use for mock up and this head has the ports widened even further than I thought they'd go. This is being rectified with some aluminum plates that are going to be welded to the sides of the runners.

http://forums.maxperformanceinc.com/foru...mp;d=1514522009

http://forums.maxperformanceinc.com/foru...mp;d=1514522009

Nick took the "292" off. If Nick doesn't add his own branding there I'll get a OHC or PMD decal for it. The "Marshall" will be staying =)
http://forums.maxperformanceinc.com/foru...mp;d=1514522009

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My Summit Racing score of the day, a 4" turbo down pipe for $20. When I get the water pump relocated in front of the cross member it should fit nicely.

I've also wired up the 4L60e and Microsquirt transmission controller, and picked up two more "core" 4L60e's. These two are from the mid-2000's which is better than the 1993 model I'll be installing first. I'll pop the pan and tail shaft housing off of each and take a look. One I'm certain is a core return, the other is from a guy doing a junkyard LS swap so a decent chance the transmission serviceable and may even be clean inside.

The downpipe on my tailgate.
http://forums.maxperformanceinc.com/foru...mp;d=1515294807

The downpipe placed in the engine bay.
http://forums.maxperformanceinc.com/foru...mp;d=1515294807

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More work on the intake. The plates have been welded to the runners to strengthen them. I shouldn't blow the welds on my manifold, lol. I've picked up a set of injectors from Fuel Injector Development that should easily supply my fueling needs. Then started to remove the cooling system and core support to begin the mounting of a 2nd Gen F-body aluminum radiator and intercooler. The plan is to get a 55 gpm Meizier remote water pump to replace the 21 gpm Craigs-Davies one I currently have. I've ordered an IO extender board (Input/Output) to get more sensor inputs to make the setup live comfortably just off the ragged edge. I'll be monitoring crankcase pressure, coolant system pressure, exhaust back pressure, pre-intercooler pressure and temperature and post intercooler pressure and temperature, as well as engine oil pressure and lash adjuster oil pressure.

The raw welds.
http://i42.photobucket.com/albums/e313/T...zpsuqgzfva0.jpg

The welds cleaned up. The throttle body port and injector bosses and rail are next up.
http://i42.photobucket.com/albums/e313/T...zpssbmi7eek.jpg

A port shot.
http://i42.photobucket.com/albums/e313/T...zpsxiw8jeug.jpg

I don't have an updated picture, but I'm about to pull a fender or two to remove the core support. I'm on the fence between getting a pre-made tubular one that still would need a bunch of work or just hacking up this core support that isn't in the best of shape anyways. Looks like someone has jacked the car up by the bottom of it.
http://i42.photobucket.com/albums/e313/T...zpsbzkinxjb.jpg

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Thanks Tom! Pistons and rods arrived nice and safe.

6" SCAT rods and some forged Ross pistons to go on them. I plan on having some valve reliefs cut into the pistons to keep the engine non-interference.
http://i42.photobucket.com/albums/e313/T...zpsg8opfgb1.jpg

http://i42.photobucket.com/albums/e313/T...zpsb0m24mjz.jpg

Then woke up this morning to see the throttle body side of the intake manifold has been worked on.
http://i42.photobucket.com/albums/e313/TheSilverBuick/Firebird%202/Throttleport_zpsjiuqwamm.jpg

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Looks good Randal. So far, you are still the only one in the US to have one, the rest have gone to Brazil.



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I'm happy to have one!

Does that mean you are out of stock?? I've contemplated picking up a second one, for stock'ish application.

When any of your other customers get them mounted up, I'd be interested to see them installed.

Last edited by TheSilverBuick; 02/01/18 06:58 PM.
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I have one raw cast intake left, thinking you might want another one since it seems to work better for the OHC intake flange compared to the Chevy. I have received confirmation that another batch has been shipped, so I should have them in a few days since the foundry is in the same state as me.



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Oooh, batch #2, awesome!

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With the "new" 4" down pipe, I need to move the turbo forward some from where I had it mounted. Since I'm moving it forward I'm also going to move it away from the engine some. I've bought some box tubing to redo the support and make it stronger.

This is the old support mount.
http://i42.photobucket.com/albums/e313/T...zpsr8fgabkj.jpg

http://i42.photobucket.com/albums/e313/T...zps0yontjrr.jpg

http://i42.photobucket.com/albums/e313/T...zpsragi48bl.jpg

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I've got a pile more pictures, but thought this one pretty nice for CNC-Dude.


Last edited by TheSilverBuick; 02/12/18 06:53 PM.
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That looks really sharp!

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Thanks for posting the updates Randal. I'm anxious to see your build come together and burning rubber.



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I'm looking forward to it too!

One more, Nick said he is going to lightly massage the intake port on the head a bit more but the match up is pretty close! Getting the injector in the field of view for a nearly straight shot at the valve is good stuff.


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This is a great thread. It is interesting to see how it has evolved over the years of this build. I wish all of the pictures were still there.


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Originally Posted By: Beater of the Pack
This is a great thread. It is interesting to see how it has evolved over the years of this build. I wish all of the pictures were still there.


Yeah, this forum didn't let me edit the old posts to update the picture links to photobucket when I moved all the photo's there. If a post is quoted and brought to the top I can get the picture, but that isn't the same as just reading through the photo history. Maybe its time I do an abbreviated "history" post.

Side note, is it just my settings that locks out the HTML code for showing the pictures(versus links), or is it the overall forum settings?

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I used photobucket on all my posts and just selected "direct" , and it showed the actual picture in the post instead of the link.



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Originally Posted By: TheSilverBuick
Side note, is it just my settings that locks out the HTML code for showing the pictures(versus links), or is it the overall forum settings?


When submitting a post - if one just pastes the actual URL link to a photo within the text it will appear as:
http://i42.photobucket.com/albums/e313/T...zps9bm8ajlm.jpg

Alternatively, one can use HTML code tools (upper left of the post editor window.) The 'globe with a paper clip' icon allows one to embed a link with a Readable name as in:
Link to TheSilverBuick's photo bucket In this case the URL is hidden under the descriptive label. There are two prompts - the first is for the URL the second is for the label.

Two icons over from the globe is the 'enter an image' icon.
Single click and one can choose to have floating or non-floating image (centered, right or left justified) as in this non-floating image:


You will then see the [url= and [img] HTML tags in the editor. One can also type the tags directly.

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All my phots were hosted in Picasa. When Google decided to end the free service they disappeared form all the sites they were posted on. They are still in my Picasa account. I'm trying to move them back to my laptop. I'm not paying for an online host. On the HAMB you can post from your desk top. I don't think the photo issue here is the fault of the website. It was caused by the changes the hosts made a while back.


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Testing... This picture should be showing twice....




Last edited by TheSilverBuick; 02/12/18 06:57 PM.
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Last edited by TheSilverBuick; 02/12/18 06:52 PM.
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Hmm, it doesn't seem to reliably work for me, but it does appear to work sometimes. I'll go back to pasting in the pictures in the conventional way to get them to pop up. Thanks Stock49.

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It's not showing up twice because of the first [IMG] tag contains an incorrect URL - so the BB software does nothing with it.

The second image is a nice example of nesting [URL= and then [IMG] tag which creates a visible photo that is also a link . . .

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No major updates. The Nick did a little finishing work on the ports to make sure the head runner was a smidge bigger than the intake runner, and doweled the head so the intake sits in the exact same location when mounting it up. He flowed the head with the whole intake assembly on it. It's a bit over 190cfm at the lift I am going to run, but picked up a bunch at low and mid lift. Approximately 30% off the seat, 20% at mid-lift and 10% more at max lift than a stock head.

Picked up a 55gpm water pump to replace the 22gpm one on the car. Also some turbo plumbing couplers to continue setting up the cold side plumbing.

Facebook video of the flow test.
https://www.facebook.com/smithbergracing...amp;pnref=story

This is where the turbo lands with the new mount.



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