Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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speedybuick
Rob Franklin

(19 posts)

Registered:
12/20/2009 05:57PM

Main British Car:
4.0 Rover intake
Posted by: speedybuick
Date: April 06, 2024 11:42AM

I picked up a complete 4.0 fuel injection intake manifold to use on my turbocharged Buick 300 build. I'm fabricating aluminum spacers to account for the width difference as well as a custom valley cover. It's my understanding the the trumpets can be shorted once the other intake is apart but after removing the bolts I'm having substantial difficulty getting the 2 sections apart. I'm using a pair of TA Performance Rover heads on this engine and while the Rover intake ports are a bit undersized for them I feel that will help throttle response and low rpm Torque. The Turbo should take care of the upper rpm airflow issues. Any tips for getting this apart?


minorv8
Jukka Harkola

(271 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: 4.0 Rover intake
Posted by: minorv8
Date: April 09, 2024 02:54AM

AFAIK there is no gasket between the upper and lower manifold. There might be glue or sealant but nothing mechanical once the bolts are removed. Gentle whack with a hammer should get them apart.

I have used non hardening sealant during assembly.


Airwreckc
Eric Cumming
RTP, North Carolina
(253 posts)

Registered:
05/28/2020 10:10AM

Main British Car:
1972 MGB-GT (working on a Sebring project) Buick 300-4 V8

Re: 4.0 Rover intake
Posted by: Airwreckc
Date: April 12, 2024 02:28PM

Rob,

I also have a similar application, although my 300 will not be turbocharged. I also have a complete 4.0 manifold and injection and plan on either replacing the trumpets with wider/shorter ones or at least shortening the ones I already have. It's my understanding that if you put the manifold in the oven (after taking everything else off), you should be able to free up the trumpets. I'd be interested i seeing your adapters for the manifold, as I intend to do the same thing. I might make mine out of high density fiberglass composite, to insulate the manifold from the heat of the engine--not sure if you've thought about that.
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speedybuick
Rob Franklin

(19 posts)

Registered:
12/20/2009 05:57PM

Main British Car:
Re: 4.0 Rover intake
Posted by: speedybuick
Date: April 19, 2024 02:36PM

Mine is sealed with a rubbery sealant. I can't even get a razor blade between the 2 halves. I'm going to bed lt the intake to the engine and use more persuasive options.


mstemp
Mike Stemp
Calgary, Canada
(223 posts)

Registered:
11/25/2009 07:18AM

Main British Car:
1980 MGB Rover 4.6L

Re: 4.0 Rover intake
Posted by: mstemp
Date: April 20, 2024 08:12AM

When removing my trumpets I put the plate in the gas bbq at 400F for 10 min or so. Worked well and no fumes in the house. Maybe you could do the same for your upper intake?


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