Adding Aluminum Intake to Caddy 500

Automotive powered airboat discussion.
cop121
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Adding Aluminum Intake to Caddy 500

Postby cop121 » Wed Sep 12, 2018 1:39 pm

Does anyone have any insight as to whether or not adjustments such as distributor timing or carb needs any adjustment when going from a stock intake on a Caddy 500 to a Aluminum Edelbrock? Thanks in advance.

SWAMPHUNTER45
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Re: Adding Aluminum Intake to Caddy 500

Postby SWAMPHUNTER45 » Thu Sep 13, 2018 11:26 am

Are you running a reduction unit or will it be direct drive?

If your engine is running a proper timing curve now then changing the intake will have no bearing on it. Nothing should be required, just verify all is working properly.

Changing the intake from a factory low to high rise can make a carb act differently and should / will require some readjustment.

Be alert to fitment when installing as most of the 2115 Edelbrocks are off spec a bit. If it doesn't just drop in and bolt holes line up perfectly you may want to explore having the Intake resurfaced.

cop121
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Re: Adding Aluminum Intake to Caddy 500

Postby cop121 » Thu Sep 13, 2018 12:23 pm

I'm running a 2 to 1 ch3 belt drive. When I installed it I had to shave a small amount off the outer edge to clearance the dowel pins was all. Other than that it dropped in and bolted right down.

SWAMPHUNTER45
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Re: Adding Aluminum Intake to Caddy 500

Postby SWAMPHUNTER45 » Thu Sep 13, 2018 1:17 pm

Ok

Well you should be good then. We use the Edelbrock Thunder AVS 800cfm on reduction engines.

I assume you know the limitations of the stock platform and have upgraded the valve train accordingly.

Cadillac Performance Engineering is a great resource for parts and tech support should you need it. 352-797-9910 Mr Branch

cop121
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Re: Adding Aluminum Intake to Caddy 500

Postby cop121 » Thu Sep 13, 2018 2:32 pm

Im currently running the 600cfm holley rejetted to 69's. Is that not enough cfm for my set up? I don't want or need to turn more than 4200 max (with the Serius series water walker prop only needing to turn 2100 at the hub) and only that to get off ground. I like to cruise around 2900

SWAMPHUNTER45
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Re: Adding Aluminum Intake to Caddy 500

Postby SWAMPHUNTER45 » Thu Sep 13, 2018 2:44 pm

It will work but a 500 inch engine at 4200 can use an 800 the cars came with carbs bigger than what your running.

Hey if it works use it. You have not said what if any mods were done to it. If your gonna run 2900 sustained I would upgrade components. I think most Caddy guys would agree to valve train upgrades.

cop121
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Re: Adding Aluminum Intake to Caddy 500

Postby cop121 » Fri Sep 14, 2018 8:36 am

I was unaware of the valve weakness until recently. Its my first airboat and am learning as I go. It was recently rebuilt from a broken rod. I am planning on looking into upgrading the valve train. The heads have had addition holes machined into them to improve water flow around the rear cylinders and a bypass has been plugged short of a 5/16 hole between the water pump and therm housing to improve circulation and cooling.

SWAMPHUNTER45
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Re: Adding Aluminum Intake to Caddy 500

Postby SWAMPHUNTER45 » Fri Sep 14, 2018 8:11 pm

Maybe post some pics of your custom cooling mods.

Be interesting to see the handy work.

cop121
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Re: Adding Aluminum Intake to Caddy 500

Postby cop121 » Mon Sep 17, 2018 8:18 am

Had I taken pictures before assembly I would be glad to post them. Each head had a hole drilled in the rear center. Apparently the block has a matching hole for water flow around the rear cylinder but the head does not originally have the matching one so they get drilled. My understanding is this allows more flow around the rear cylinder. Also, there is a bypass between the water pump and thermostat housing that diverts water. There is a copper plug there now to keep more of the water flowing through the heads. However, there is a 5/16 hole in the plug so some water still flows through the bypass.

SWAMPHUNTER45
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Re: Adding Aluminum Intake to Caddy 500

Postby SWAMPHUNTER45 » Mon Sep 17, 2018 11:27 pm

The plug under the housing is required to ensure circulation when not using a Cadillac specific thermostat. The small hole is drilled in it to bleed off air bubbles. As far as your other trick that is not one we use.

Let us know how the new intake works for you


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