"Stoppered" L67 heads on an L36? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-13-2007, 03:24 PM   #1
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Default "Stoppered" L67 heads on an L36?

Anyone think it would be possible to put L67 heads on an L36, but with the injector holes "stoppered" somehow?

(I'm thinking something like a small, gasoline-proof rubber or polyurethane stopper with a tapered screw running through the middle to make it "bulge" and hold fast in the injector hole)

What do you think...doable? Any better ideas for how this might be accomplished?
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Old 11-13-2007, 03:32 PM   #2
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Flow might be a bit turbulant from the port and stopper.

I see what your planning thought.
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Old 11-13-2007, 03:56 PM   #3
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Quote:
Originally Posted by BillBoost37
Flow might be a bit turbulant from the port and stopper.

I see what your planning thought.
I'm sure you do...

I would not care much about flow while in "L36 mode"...it'* more a question of "if I ran like that for a few weeks, would I blow up the engine?"
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Old 11-13-2007, 03:59 PM   #4
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I doubt it would blow. If the stopers didn't come out or get pulled in.

What is your plan for the LIM?
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Old 11-13-2007, 04:19 PM   #5
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Quote:
Originally Posted by BillBoost37
I doubt it would blow. If the stopers didn't come out or get pulled in.

What is your plan for the LIM?
I'm thinking it should work, because the stoppers would be having vaccuum pulled on them, and the "lip" cast into the lower part of the injector hole should prevent them getting completely sucked in.

If I fabbed it up right, I might even be able to develop a "cover" that not only hides the stoppered holes, but prevents the stoppers backing out...hmmm

Now I'm maybe thinking wooden (or metal) dowels worked to accept injector o-rings, and held in place with some aluminum angle...or some pour-in-place RTV that will fill the entire machined out area as well as the injector hole...

I would plan to run stoppered L67 heads, L36 UIM / LIM / fuel rail / injectors (and maybe valve covers) in "L36 mode", and unstoppered L67 heads, L67 */C / LIM / fuel rail / injectors / valve covers in "L67 mode."
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Old 11-13-2007, 06:32 PM   #6
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It'* more work, but maybe..
Drill the injector holes out large enough to put a externally threaded injector bung in there..
That way you could just drill and tap them..

Or.. even better.. just drill and tap the L36 LIM (and port out the injector hump) and run the injectors in the head, n/a.
You would have to modify the L67 rails to work or get a set of reworked stockers from a vendor though.

Just putting that out there.. I would be weary of a formable plug there.. But thats just because I'm not real familiar with it.

If you want info on what tap and plug to get, I have the info somewhere from when I did my buddies F-body L36 LIM.
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Old 11-13-2007, 07:00 PM   #7
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Quote:
Originally Posted by 95naSTA
It'* more work, but maybe..
Drill the injector holes out large enough to put a externally threaded injector bung in there..
That way you could just drill and tap them..

Or.. even better.. just drill and tap the L36 LIM (and port out the injector hump) and run the injectors in the head, n/a.
You would have to modify the L67 rails to work or get a set of reworked stockers from a vendor though.

Just putting that out there.. I would be weary of a formable plug there.. But thats just because I'm not real familiar with it.

If you want info on what tap and plug to get, I have the info somewhere from when I did my buddies F-body L36 LIM.
I did consider the idea of running FI into the heads at all times (I think the L36 should have done this from the factory); however:

1) Part of what I'm trying to avoid is:
a) paying big $$$ for a vendor-supplied solution, or
b) modding my own fuel rails, which I see as potentially leading to death and/or disfigurement

2) Also, when running n/a, it would have to LOOK just like a stock L36, so no modded or aftermarket fuel rails allowed when in n/a mode.

Drilling-and-tapping is an intriguing idea...I wonder if that could be done to the L67 heads such that either a threaded plug or an injector-with-o ring would fit.

You mentioned "injector bung"...is there a ready-made aftermarket piece you know of? (Kinda like an O2 bung plug?)
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Old 11-13-2007, 07:25 PM   #8
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Quote:
I see what your planning thought.
me too lolllllllllllllllll



you could put a set of fake injector in the hole whitout pluging them
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Old 11-13-2007, 07:54 PM   #9
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FWIW there is a local guy here with an SS M90 kit. Well.....he blew up the L36 and put a stock L67 longblock in it, but wanted to keep his SS kit LIM and fuel rails.... So he left the L67 heads on the engine and drilled and tapped them and put bolts in them with some thread sealer. Has worked well for him so far.
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Old 11-13-2007, 09:32 PM   #10
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Default Re: "Stoppered" L67 heads on an L36?

[quote="agrazela"]Anyone think it would be possible to put L67 heads on an L36, but with the injector holes "stoppered" somehow?/quote]

Yes, and I doubt it will make any difference in airflow. When I did my L36 to L67 Series II, I noticed that the head castings are the same, they all have the bumps in the castings where the injector bosses are milled on just the L67 heads.

As for plugs...I would tap them for the nearest size of pipe plug and go with that.

However, You might be better off using L67 fuel rails and putting the injectors in the head holes, and plug the manifold bosses, or just have the manifold casting welded closed.
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