Engine and Transmission Tech

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

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Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 02, 2019 01:26PM

Thanks a lot for the pics, Jim. Pretty small engine compartment, I see why they are fender dump headers. And what engine is that for? RV8? I'm new to all these engines.
Cheers


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 02, 2019 01:34PM

John, Buick 215/Rover 3.5, 3.9, 4.0 and 4.6. 75-80 have a little larger engine compartment as it was designed to fit the Rover V8. The width of the 4.5/4.9 is almost exactly the same as the Rover V8 at the header flange. It is much shorter though which allows more room between motor and radiator. Simple motor mount idea:
bowler motor mounts.jpg



Edited 1 time(s). Last edit at 10/02/2019 01:41PM by mgb260.


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 02, 2019 01:43PM

John have you thought about a oil pan baffle, Cometic MLS head gaskets and/or electric water pump?



Edited 1 time(s). Last edit at 10/02/2019 02:02PM by mgb260.


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 02, 2019 06:42PM

Jim,
Stock 4.5/4.9 oil pan has baffle built in. I'm not real sure about the RWD 4.1 oil pans. Allante 4.5 has a cast aluminum oil pan unique to itself. I can't speak on the Allante pan baffle because I have never seen one of these oil pans live before. I have been pretty happy with Fel-Pro and Victor Reinz head gaskets, but those two are the only ones I will use. Not sure on Cometic MLS gaskets. I'm not a big fan of electric water pumps. Thats one reason I went from SBCs in my Fieros to Cadillac 4.5/4.9 engines. Would the stock Cadillac water pump be a problem in a MG?
Cheers,
John


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 02, 2019 06:44PM

Thanks for the info on the Rover RV8. I'm very familiar with the Buick 215 engine, but had no idea it was related to Rover..
John


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 02, 2019 06:52PM

John, I've heard the 4.5/4.9 water pump and gaskets are a problem. The GM Delco brand was best? Do you use gasket sealant and locktite on the bolts? I prefer the old green antifreeze over the Dexcool because it wicks and eats up the gaskets.


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 02, 2019 07:04PM

Jim,
The only water pump gasket problem I had was installing it. That was because of user error and a cheap eBay gasket. I just use regular antifreeze. A few of the water pump bolts need sealant or it helps to seal it. I have used a modified 4.1 water pump on a 4.9 so I could run a power steering pump.
Suspension.jpg



mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 02, 2019 07:10PM

John, Thanks! The 4.1 water pump looks more like a conventional water pump.


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 02, 2019 07:15PM

So how about a pic of your ride, Jim? 1973 MGB , 260 Ford V8. Very Cool! Sounds like Sunbeam Tiger inspired!
Cheers


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 02, 2019 07:28PM

My73 MGB was originally for the 260 but now I have a 65 Sunbeam Alpine for the Ford V8. I have a 93 4.9 in pieces in my shop in WA. My projects have been on hold the last 6.5 years as I am in AZ working in a Power Plant. 3 more months before I retire back in WA. I have helped a few on this and other boards and plan on a performance parts business similar to yours but not on the Caddy V8. My parts business will be more to fill the gaps on what other vendors don't offer. I probably have at least a year of home improvement projects first!


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 14, 2019 08:55PM

I had an extra 4.9 intake manifold and decided a cross section view would be nice. Perhaps a starting place for a custom intake manifold?
Cheers
4.9 head-maifold01.jpg
4.9 head-maifold.jpg


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 14, 2019 09:36PM

John, Looks like the port spacing is pretty common. SBC and SB Mopar intakes have been modified to fit other motors. Or fabricated
sheet metal intake. Here is a pic of SB Mopar cheap offshore Air Gap intakes made to fit a Cadillac V8. I think you are onto something!
caddy mopar.jpg



Edited 2 time(s). Last edit at 10/14/2019 09:41PM by mgb260.


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 14, 2019 11:25PM

It would be nice to 3D print an intake manifold for the 4.5/4.9 engine.


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: October 17, 2019 09:31PM

I'm building a set of 180 degree headers for my Cadillac 4.9 V8 engine. These headers will even out the exhaust pulses from left to right engine banks, increase exhaust scavenging and produce more of a European V8 sound. Cheers
180 Headers01.jpg
180 Headers02.jpg


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: October 18, 2019 08:50AM

John, Very cool!



MGBV8
Carl Floyd
Kingsport, TN
(3899 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: 4.5/4.9 Cadillac V8
Posted by: MGBV8
Date: October 18, 2019 10:49AM

Sweet!


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: December 10, 2019 01:33AM

I finished mocking up the 180* headers. Ready to test fit in car. Also working on an adjustable cam timing sprocket.

180 Headers09.jpg
Cam Gear01.jpg


mgb260
Jim Nichols
Sequim,WA
(2042 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 4.5/4.9 Cadillac V8
Posted by: mgb260
Date: December 10, 2019 10:20AM

John, Great work! I noticed when I pulled my motor apart the nylon cam thrust button was brittle and fell apart. Are you using something better?


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: December 10, 2019 07:47PM

Hi,
Thanks for the compliment on the exhaust. Its been a fun project. I have never had a problem with the cam thrust button before. Not sure what to tell you on that. I'll look into it.
Cheers


Johns 4.9
John Leo

(17 posts)

Registered:
09/30/2019 10:13PM

Main British Car:


Re: 4.5/4.9 Cadillac V8
Posted by: Johns 4.9
Date: January 25, 2020 05:29PM

The 180* headers are finished and installed in the car! Sounds great! Kind of like an older Can Am sports car. A bigger performance gain then I had expected. Cheers
180 Headers13.jpg
180 Headers15.jpg
180 Headers14.jpg
180 Headers16.jpg



Edited 1 time(s). Last edit at 01/26/2020 02:23AM by Johns 4.9.
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