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Old 01-16-2016, 08:51 PM   #99
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Interesting...
My '87 has the coil separate.
Here's the coil bracket that I plan on using.
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Old 01-17-2016, 11:53 AM   #100
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This is the distributor used in my set-up
Performance Distributors - Performance Distributors
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Old 01-17-2016, 12:01 PM   #101
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and a little view of the fuel/spark tables.
The fuel table is a bear to set up and basically only adjusted by test driving under load at different RPM's. This is where the self-tuning system would be the most helpful.
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Old 01-17-2016, 01:34 PM   #102
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Brad,
As I texted you, I am not able to get to my MH, or my storage 454 engine, but I do have some pics that might help you see how low it is, and also how the distributer and coil is, and fuel line were mounted/routed.
Note, that the TBI body is mounted on top of a cast iron coolant heated thing I believe they call "The Donut". This thing is about 1.5" thick. Both of these engines had a low top airfilter.... not the tall Banks replacement... I have doubts about my doghouse clearances even using the stock intake...








FYI, further to the suggestions made by our friend, about MAP sensor mounting... Here is the way the '87 Suburban was mounted... this is passenger side firewall. 2 relays(one is fuel pump ), and the MAP sensor.
Looking at the pictures I posted above, it looks like the '90 motor had the MAP on a bracket on the rear of the pass side valve cover...

On the '87, I bet this is not much higher that the air filter top, so you could mount it on the rear firewall.


Here is another pic, that you can see how high the MAP sensor is mounted relative to the engine/distributer. It is just visible on top LH side of pic.
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Old 01-17-2016, 02:29 PM   #103
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Steve, thanks for the pictures! As the saying goes a picture is worth a thousand words.

Attached is a sketch of my doghouse opening.
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When I was Modifying my doghouse opening to use the 310/345 cover I used the 84 310 as a model so these numbers should be pretty close for your opening as well. The 14" dimension from the truck frame rail to the doghouse opening trim piece is the key. If your's is more or less than that then you should be able to determine the amount of clearance that you'll have.

My engine has the Performer 2.0 intake, a 1/4" spacer, Edelbrock 1406 carburetor and the Spectra SPE-9849 air plenum. Total from the carburetor pad to the top of the plenum attaching nut is 7-1/4".

I need to determine what the TBI setup is going to be from the carburetor pad to the top of the plenum. Once I have that number I'll know whether everything will fit under the doghouse.

I'm at the point where if I need to raise the doghouse opening slightly it would be easy to do. But I don't want to wait to much longer to wrap that up!

The pictures showing the MAP sensor mounting helps a lot. It will easy to fabricate a bracket to hold the sensor. I'll most likely mount it using the valve cover bolts like the factory did. Keep in mind with a doghouse there is no rear firewall! That's why I'm inclined to mount it like the factory did.

Also based on where the coil is mounted in the pictures it looks like the Performer intake has the same mounting holes. If so that solves another problem.


Thanks!

Brad
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Old 01-17-2016, 02:46 PM   #104
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Quote:
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and a little view of the fuel/spark tables.
The fuel table is a bear to set up and basically only adjusted by test driving under load at different RPM's. This is where the self-tuning system would be the most helpful.
Peter what program are you using to tune with?

Also are you able to tune while driving?
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Old 01-17-2016, 02:47 PM   #105
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This is the distributor used in my set-up
Performance Distributors - Performance Distributors
Those distributors aren't cheap are they!
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Old 01-17-2016, 03:52 PM   #106
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I just did some digging... and look what I found in my archives...

I have a Edelbrock Performer 2.0...


Now, refer to my comments about the OEM carb and TBI intakes being low profile... and by that I mean the carb mounting and the "Donut" mounting appear to be BELOW the head...

Look at the Edelbrock height...


With the Banks filter on...



Here I measured... about 14 1/2" to top of Banks tall filter.
I estimate, that the Edelbrock 2.0 is about 4" taller than the carb or TBI


Hope that helps.
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Old 01-17-2016, 04:05 PM   #107
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I think you can see by comparing the TBI intake pics that I posted, against the Edelbrock pics that the carb/TBI mounting pad is below or pretty much at the intake to head mounting bolt height, where as the Edelbrock pad is way above.
I assume that extra height is what makes the Edelbrock perform better and distribute mixture better between the ports on all cylinders... the downside is height.

Not a good pic, but here is my stock cast iron 454 carb intake as I was removing the Edelbrock carb... note the spreadbore adaptor that was under it, which is maybe 1/2 thick... and how low the manifold carb mounting pad is in respect to the heads...
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Old 01-17-2016, 04:21 PM   #108
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Peter what program are you using to tune with?

Also are you able to tune while driving?
Its a Holley/ECU specific software and yes, it can be tuned while driving (by your very trusted and knowledgeable friend). It appears that there are set limits that would keep you from blowing the engine up. I entered a - value once by mistake while idling and i think I heard the software laughing at me
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Old 01-17-2016, 04:25 PM   #109
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Steve,

Good pictures.

I'll have to go back down to the shop and take another measurement this time from the valley to the top of the carb pad. I know from the pad up I have 7-1/4" taken up with the carb and air plenum.
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Old 01-17-2016, 05:28 PM   #110
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Steve, I just took some more measurements off my engine. The carburetor pad is angled from back to front. Over the length of the engine (~22") there is a 1" tilt. The tilt is to account for the engine being tilted in chassis.

On on my engine I laid a straight edge along the top of the air plenum from front to back. At the back by the distributor it's 12-3/4" and at the front it's 11-3/4". So at the carburetor it will be about 12-1/4".

If your 14-1/2" measurement was taken at the back of the manifold then you likely have about 14" at the carb. I spent some time searching for the throttle body height and it seems that the throttle body itself is 2" tall. You then have to add in some thickness for the TBI adapter and I've seen them range from 1/4" to 1".

Bottom line is I'm fairly certain I can fit a throttle body under the doghouse cover and still use my 4" tall air plenum. If not I can switch this low profile air plenum.

Air Intake Plenum Low Profile Single 4 Inlet Polished Cast Aluminum

If you ask me you should ditch the Banks filter housing and switch to a remote air filter. As far as I know everyone that has done so has reported better economy and performance.

Brad
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Old 01-17-2016, 05:30 PM   #111
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Its a Holley/ECU specific software and yes, it can be tuned while driving (by your very trusted and knowledgeable friend). It appears that there are set limits that would keep you from blowing the engine up. I entered a - value once by mistake while idling and i think I heard the software laughing at me
Personally I think computers laugh at us all the time

The chevy ECMs can be tuned while driving if you use an emulator setup which with all the hardware and software would cost in the neighborhood of $325.

By the way, your package is on the way. You should see it Wednesday.
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Old 01-17-2016, 05:40 PM   #112
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..

By the way, your package is on the way. You should see it Wednesday.
Thank you, I will report back to you as soon as i can.
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