MG Sports Cars

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

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Chris Lindh
Chris Lindh
Canton, GA
(5 posts)

08/14/2015 04:30PM

Main British Car:
'77 MGB Roadster Ford 347

1977 MGB / Mantell Ford V8 Kit #142
Posted by: Chris Lindh
Date: April 13, 2016 06:09PM

Dyno video here: []
I had my Ford V8 on an engine dyno Friday, 338 hp, 383 tq. The dyno operators didn't like the air fuel ratio fluctuations from 9s to 13s. Their theory is the EFI cam does not allow the carburetor to deliver fuel correctly. Best power was made with 70/76 jets, 7.5 power valve. The engine will be fuel injected using MS2 when installed into the MGB.

Ford 347 details:
1388 AFR 185 Heads
35-308-8 Comp Cams 266HR EFI Cam, 0.533 lift, 266/270 (210/215 at 0.050) duration, 114 Lobe Separation
1-94180 Scat Rotating Assembly 3.4" stroke, 4.030" bore, compression 9.6
U650HO AED Ultra Carburetor
Weiand 8124 Intake Manifold

This 1977 MGB was my first car, found it on a car lot when I was 15 in 1990. It sat in a field from 1998 to 2010.

Conversion plan:
Mantell conversion kit; a special thank you to Pete Mantell, always responsive to my questions.
Pro Race Balancer will not clear the steering rack, Professional Products 90045 or 90046 will clear
Classic Conversions Engineering Wilwood big brake kit
World Wide Imports / Peter Caldwell adjustable lever shocks
Ford World Class T5
Ford 8" rear axle, Auburn differential, 3.25 gears
Classic Conversions Engineering 4 link

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