MG Sports Cars

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

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redlinepontiac
ray nelson

(4 posts)

Registered:
01/14/2012 07:15PM

Main British Car:
L67 swap
Posted by: redlinepontiac
Date: January 14, 2012 07:27PM

hey guys i just picked up a 74 MGB(it needs some attention)

ive found lots of information on 3.1/3.4 swaps but very few on the 3.8SII/I, im guessing due to the 90degree heads?

i have a T5 and bellhousing left over from another project(out of a wrecked 99)firebird, and my spare built up L67 motor with IS3 cam,roller rockers and frozen boost intercooler. i have a complete wireing harness and PCM for the motor. i want to swap these into the MGB. ive been reading as much as possible on the swap. theres lots of information.


do the FWD motors have a machined section for the pilot bushing?

does anyone have pictures of how they did the hyd. throwout bearing?

and speedo issues?

im the tuner for a shop that builds supercharged Wbodys so i know what i have to do pcm wise.

any help would be great, or if anyones done the swap please email me


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: L67 swap
Posted by: BlownMGB-V8
Date: January 14, 2012 08:55PM

As I'm sure you know, this is basically the same engine as the 231 and there are a couple of those that have been done. (check out the how it was done articles) The bellhousing and other things will be different of course but in general terms it is the old 215 (or Rover) V8 with 2 cylinders lopped off, so it will fit just fine.

Can't really help with your questions but I'm very interested in seeing your progress on this, as it should be an excellent high power engine for the MGB.

JB


redlinepontiac
ray nelson

(4 posts)

Registered:
01/14/2012 07:15PM

Main British Car:
Re: L67 swap
Posted by: redlinepontiac
Date: January 14, 2012 09:19PM

thanks jim for a fast response.

ive had the SII 3.8 up to 500crank hp with a well a decent blower build, that would be way overkill for this car, whats the breaking point of this mgs dinky rear end?
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BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: L67 swap
Posted by: BlownMGB-V8
Date: January 14, 2012 09:28PM

You can get by with up to about 300 hp, maybe more depending on how you drive it. The ring gear is very close to 8" but the spiders and axle shafts are it's weaknesses. Generally 250 is considered quite safe. The BritishV8 meet is not far off, that would be an excellent time to look at axle options.

Jim


redlinepontiac
ray nelson

(4 posts)

Registered:
01/14/2012 07:15PM

Main British Car:
Re: L67 swap
Posted by: redlinepontiac
Date: January 17, 2012 10:39PM

thanks jim, ive been searching alot for the bushing issue,

everyone says it just bolts up without any problems.

hmm i do have a IRS LSD from my old lexus IS300... i wanted to keep this a budgetish build.


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