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#92551 - 09/24/17 07:35 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
tlowe #1716 Offline
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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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#92553 - 09/24/17 10:43 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: tlowe #1716]
TheSilverBuick Offline
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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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#92554 - 09/24/17 02:53 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
tlowe #1716 Offline
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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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#92556 - 09/25/17 07:49 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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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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#92557 - 09/25/17 12:34 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
Blackwater Offline
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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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#92559 - 09/25/17 01:45 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
CNC-Dude #5585 Offline
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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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#92564 - 09/27/17 08:43 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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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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#92667 - 10/14/17 07:10 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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Loc: Ely, NV
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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#92722 - 10/20/17 10:22 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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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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#92882 - 11/18/17 09:21 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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Registered: 12/22/10
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Loc: Ely, NV
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.


Edited by TheSilverBuick (11/18/17 09:23 PM)
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#92884 - 11/19/17 07:51 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
THE FRENCHTOWN FLYER Offline
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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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#92885 - 11/19/17 09:01 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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Loc: Ely, NV
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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#92886 - 11/19/17 11:56 AM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
efi-diy Offline
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Registered: 11/21/04
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Loc: Calgary Alberta Canada
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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#92887 - 11/19/17 01:27 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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Registered: 12/22/10
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Loc: Ely, NV
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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#92889 - 11/19/17 02:26 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
strokersix Offline
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Oooh, thanks for the port porn! Pretty work.

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#92891 - 11/20/17 02:35 PM Re: Hacking together EFI on an Pontiac OHC Six [Re: TheSilverBuick]
TheSilverBuick Offline
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Registered: 12/22/10
Posts: 460
Loc: Ely, NV
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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