MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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74ls1tr6
Calvin Grannis
Elk Grove,CA
(1150 posts)

Registered:
11/10/2007 10:05AM

Main British Car:
74 TR6 / 71 MGB GT TR6/Ls1 71 MGB GT/Ls1

authors avatar
Re: LS4 Into an MGB
Posted by: 74ls1tr6
Date: May 05, 2014 01:26PM

Scott still looking for the air box!


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: May 05, 2014 02:05PM

Calvin, absolutely no rush at all. Please don't take time away from what you need to do for this.

Thanks!

Scott


74ls1tr6
Calvin Grannis
Elk Grove,CA
(1150 posts)

Registered:
11/10/2007 10:05AM

Main British Car:
74 TR6 / 71 MGB GT TR6/Ls1 71 MGB GT/Ls1

authors avatar
Re: LS4 Into an MGB
Posted by: 74ls1tr6
Date: May 07, 2014 10:58AM

Ok Scott,

Have some photo's of the air cleaner box off a 2002 Camaro Z28. Also have some of the throttle body tube, and if you need one a computer holder.
By the looks of the air cleaner box you could trim down the sides and it could be usable? Looks like it hangs on the radiator top?

2014-05-07 07.36.40.jpg


2014-05-07 07.36.57.jpg


2014-05-07 07.37.28.jpg


2014-05-07 07.37.40.jpg


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: May 07, 2014 07:13PM

Calvin, you have a PM!


mgb4tim
Tim Nagy
Pittsburgh, PA - USA
(44 posts)

Registered:
11/22/2008 06:38PM

Main British Car:
1971 MGB 5.0 EFI

Re: LS4 Into an MGB
Posted by: mgb4tim
Date: May 09, 2014 11:47AM

Something like an airbox is the kind of stuff I'm going to enjoy making with my fiberglass experience.


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: May 27, 2014 07:12PM

Haven't been posting because there wasn't anything new to report. Still making steady progress.

The wiring harness is, for all intents and purposes, done. What remains is better done with the engine out of the car. As anyone who has done something like this before knows, there are a million details to deal with...all part of the fun in projects like this.

I use the original gauges and I was planning on drilling out a head to accommodate the "B" temperature sender. Fortunately, I came to my senses before making that stupid move. What I did was chucked the sender in my drill press, turned it down to the correct diameter, and threaded it to fit into the existing hole at the back of the passenger side head. This picture shows the LS temperature sender along side the "B" unit. The thread is 12mm X 1.5, FYI.

LS4TemperatureSensors.jpg

This one shows it in the head. I needed to make sure it was going to fit correctly before pulling the engine to put the firewall back together.

LS4MGTempSensorInstalled.jpg

So I'm making slow but steady progress on the firewall. I'm tackling the hard side first and expect the remainder is going to go more quickly. You can see my approach in the photo below.

LS4FirewallStart.jpg

I spent a lot of time measuring and fitting the steering column before welding things together and I'm going to tweak what you see here a little more before finishing that side. I'm using 16 gauge steel if you're wondering. I'm working now to finish the engine compartment completely. That includes finishing the firewall, cross member, running new brake lines, finishing the motor mounts, and mounting the steering rack and steering shaft. Hopefully another few weeks will do it.

One other bit of news is the car won't be ready for Colorado. I'm sure that isn't surprising to anyone, it was a long shot. So now I'll be shooting for the fall get together in Townsend. We will see.


BWA


(319 posts)

Registered:
04/13/2010 08:13PM

Main British Car:


Re: LS4 Into an MGB
Posted by: BWA
Date: May 27, 2014 11:38PM

Scott it is looking good!!
On my TR6 I used the stock TR6 temp sender and mounted it into the aluminum thermostat housing on the 3400.
My buddy that did the electrical work told me that it would have to be properly grounded. I told him is it not grounded to the engine via the aluminum housing. He replied that it is better to have a separate ground to the sender than have it ground through the aluminum body. So I made a washer with a tag on it out of copper and it is held in place by the sender. The ground wire then plugs onto the tag.

Cheers
Byron



Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: May 28, 2014 07:35PM

Quote:
On my TR6 I used the stock TR6 temp sender and mounted it into the aluminum thermostat housing on the 3400.
My buddy that did the electrical work told me that it would have to be properly grounded. I told him is it not grounded to the engine via the aluminum housing. He replied that it is better to have a separate ground to the sender than have it ground through the aluminum body. So I made a washer with a tag on it out of copper and it is held in place by the sender. The ground wire then plugs onto the tag.

Thanks for the feedback Byron. Interesting. I ran the same sender on the aluminum lower intake on my V6 and it seemed to work without issue. Was your buddy worried about gauge accuracy? Is there that much of a difference between an iron block and an aluminum block? Just curious.


mgb260
Jim Nichols
Sequim,WA
(2004 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: LS4 Into an MGB
Posted by: mgb260
Date: May 28, 2014 08:14PM

Scott, I've heard of Teflon thread tape causing issues with grounding sending units. Hey, you're getting there!


BWA


(319 posts)

Registered:
04/13/2010 08:13PM

Main British Car:


Re: LS4 Into an MGB
Posted by: BWA
Date: May 28, 2014 09:06PM

Scott I talked to my electrical buddy and he has 2 reasons:
1/ On the 3400 all sensors that attached to aluminum bodies came from GM with both a power lead and a ground lead.
2/ With dis-similar metals you get corrosion issues, oxides that build up and create resistance. Aluminum is bad for this.

On your fuel lines will you have to go to larger lines for the bigger thirsty er er er engine?

Cheers
Byron


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: May 29, 2014 06:47AM

Jim,

Thanks. Still have a little ways to go but progress is steady.

Bryon,

Sounds like a really good idea and I"m not trying to discount it but interestingly, the grounds from the sensors go to the grounds in the PCM which usually are grounded to the engine. Mine are all to a common point on the passenger side head.

I'm already running 3/8" line for my supply (from my V6 swap) and that is what the LS4 needs so I should be good there. It's a returnless system so I'm going to run a Corvette fuel filter/regulator which has a single 3/8" outlet to the engine but allows you to run a pump that recirculates and it has a 3/8" supply and 5/16" return on the tank side. I'll go into more detail when I get to that point. I'm in the process of acquiring what I need for the fuel system now as a matter of fact. The AN fittings aren't cheap!

Scott


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: June 10, 2014 09:10PM

One inch at a time! So I'm still putting the firewall back together. It's pretty tedious work but I'm pleased with the result. I'm doing the most complex stuff first and I believe I just about have that part complete. Hope to have the firewall done at the end of this coming weekend. I'm taking my time because this has to be done right. It's amazing how fast 8-10 hours can go by. Here's where it sits at the moment.

LS4Firewall3.JPG

One thing I didn't realize about the MGB firewall before I started this is the heater plenum seems to be an important part the unit body in that area. It contains some of the thickest metal I've cut into.

I've been wondering about the bellhousing alignment and thought it would be better to do the measuring now rather than wait and then find an issue at an inopportune time. Good thing I did. So both the bellhousing face and bore runout were measured. I got about .014" on the bellhousing face and a measured value of about .020" on the bore runout which means it is about .010" off center. Both are out of spec so something will need to be done. There are a couple of ways to handle this, another bellhousing, offset dowel pins, and/or shimming the bellhousing. I checked into getting the bellhousing machined but that will be a last resort. Most likely I'm going to have to go with another bellhousing but I'm going to try shimming it first to try to get the bellhousing face parallel and then see where the bore runout ends up. The spec is 0" to .005". Oh, I can't seem to find the right sized offset dowels pins. The small GM pattern uses dowels that are about .71" in diameter, I believe, and they are hollow too. The available pins I could find are a much smaller diameter so it appears they won't be an option in this case. Should be an interesting exercise.

In other news my friend Artie, who I think most of you may know, will be coming out to Ohio during the week of the V8 meet and we're going to try to get some major stuff done on the car. For those of you who don't know him he's a British V8 wanna be and a Corvette guy. :-) My wife will be away so there shouldn't be a lot of distractions. Should be a lot of fun and I'm looking forward to it.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5821 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: LS4 Into an MGB
Posted by: BlownMGB-V8
Date: June 10, 2014 10:25PM

Scott, I ran into that exact problem with a D&D bell I used on my original 215 conversion, although I think your runout is a little more. I made offset dowel pins on the lathe and cut a large screwdriver slot in the end so I could turn them. They weren't very hard to make but without a lathe wouldn't be easy. For the angular misalignment I wouldn't hesitate to cut the block face of the bell, even with a coarse file.

Jim


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: June 11, 2014 06:21AM

Thanks for the advice Jim.


74ls1tr6
Calvin Grannis
Elk Grove,CA
(1150 posts)

Registered:
11/10/2007 10:05AM

Main British Car:
74 TR6 / 71 MGB GT TR6/Ls1 71 MGB GT/Ls1

authors avatar
Re: LS4 Into an MGB
Posted by: 74ls1tr6
Date: June 17, 2014 05:05PM

Scott,

Package should be there next Tuesday!



Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: June 17, 2014 06:57PM

Thank you Calvin!!


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: June 23, 2014 02:09PM

Made some visible progress this weekend. The engine bay is done except for a small section near the starter, finishing the driver's side motor mount, some minor clean-up of the exhaust openings and preparation for paint. I'm very pleased with how it turned out. Here is where I am at the moment:

LS4FinishedFirewall.JPG

I also got the cross member buttoned up and the upper gussets welded to the passenger side motor mount:

LS4FinishedCrossmember.JPG

LS4FinishedPassMM.JPG

Next up is assembling the steering and getting the engine/transmission back in for a final check of clearances. Then getting the engine changes done and putting it into the car permanently.

Got another bell housing but haven't had a chance to check it on the motor yet. Keeping my fingers crossed on that one. The original bell housing was too far off to use without spending a lot of money.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5821 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: LS4 Into an MGB
Posted by: BlownMGB-V8
Date: June 23, 2014 03:07PM

Scott, the only issue I can see there that you might want to think about has to deal with front/rear stiffness of the column mount where the original sat in a cup. Don't know if it is an issue or not, could be a factor in crashworthiness maybe. I'm sure functionwise it'll be fine.

Jim


Scott68B
Scott Costanzo
Columbus, Ohio
(541 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: LS4 Into an MGB
Posted by: Scott68B
Date: June 23, 2014 05:01PM

Jim,

Thanks for the feedback. It's pretty stiff, I used 16 gauge steel throughout. I haven't noticed any flexing at all to this point but I will double check and deal with it if I find anything.

Take care

Scott


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5821 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: LS4 Into an MGB
Posted by: BlownMGB-V8
Date: June 23, 2014 11:19PM

Should be fine.
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