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There seem to be three series of GTA engines.

00502/A - Initial series sported a magnesium front cover and a sand cast head. Magnesium front cover subject to recall in Germany dated March 4, 1966 (see Dasse Alleggerita) with highest chassis number listed as 613834.

I am unsure whether the later 00502 engines were fitted with the aluminum front cover after the factory recall or whether they became 00532/A engines at that point.

00532/A - Second series has an aluminum front cover and a sand cast head. At least two known engines on 1967 model cars – 613880 and 613891. Second series denotes the introduction of aluminum front cover?

00532 - Third series engines also have an aluminum front cover but also a die cast head like GTA junior. Engine on 848001 and on an 613 series Autodelta prepped car (replacement engine?). Two known engines have additional water cooling jet holes in water manifold in block look like they were drilled with a jig - either at Autodelta or possibly already at the factory. Is this the case for all engines of that series or any other series? Third series denotes use of die cast head?

All GTA front covers are unique and can be identified from different series engines by their not being drilled for the mechanical fuel pump rods, thus not requiring a blanking plate. The front cover also has three studs for the distributor mount. The recall suggested use of an adapted Giulia Super front cover, which requires a blanking plate for the fuel pump holes.

Nitrided crank – dark grey in color. Was there ever a non-nitrided crank used? Competition manual suggests that, as well as some crank failures in early on in racing. Parts manual (date 12/67 – need to check earlier parts manual) only notes one crank installed in GTA – 105.32 number.

HD rear main bearing on all GTA blocks and all unnumbered replacement blocks (as for other 1600cc production cars)

HD rods fitted to all cars (same rods later introduced for general production) – specially prepped for competition cars.

Ancillaries:

GTA’s had unique water pump with 105.32 number.

Distributor was always Marelli S119A

Carburators always were Weber 45 DCOE 14 – sleeved down venturis for Stradale versions.

Starter mounted on silentblock bushings (105.32.05.030.01) presumably to reduce shock loads on magnesium bell housing – optional in parts catalogue but were there any cars fitted from the factory without it?

Prepared generator (105.32.05.050.00) – special sealed bearings, epoxied windings for high rpm use – optional in parts catalogue. Again were there any cars fitted from the factory with the standard Bosch generator that had a tendency to self-destruct at high rpm.

Steel flywheel fitted to all GTA’s.
 

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Thanks Alle for your summation.

Ciao

  • Ken
 

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There were also 2 commonly used and some special oil pumps. The biggest difference was the manufacturing method and heat treatment of the pump main shaft.
 
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