This comparison is based on technical specifications as available in brochures, books, articles etc.

Item \ CarLombardi Grand PrixOTAS Grand PrixGiannini Grand PrixAbarth Grand PrixAbarth Scorpione SAbarth Scorpione SS
Engine Fiat 850 Special (843cc) Giannini tuned Fiat 850 to 817cc (smog except) Giannini modified Fiat 850 to 982cc Fiat 850 Coupe MkII (903cc)
Fiat 124 (1197cc) pushrod bored to 1280cc
Bhp DIN/rpm 43/6400 55/7000 ? 52/6500 75/6500 100/6200
Comp. ratio 9.3:1 10:1 ? 9.5:1 10.5:1 11.5:1
Gearing 4.63 ? ? 3.89 or 3.70 (?)
Bellhousing Std. Fiat 850 ? ?
Abarth conversion
Starter Std. Fiat 850 ? ? Special Marelli
Engine mounting Pressed steel crossmember in standard 850 position Abarth tubular crossmember under sump (round section)
Exhaust Fiat 850 Abarth tube headers & muffler ? Abarth tube headers & muffler 124 cast header, Abarth muffler
Carburator ? 1 bl 32 Solex or Weber 2 bl 30DIC Weber ? 2 bl Solex 32 PHH or 2 bl Weber 32 DCOF
Sump Fiat 850 Giannini alloy or 850 tin Giannini alloy ? Fiat 124 tin
Valve cover
Fiat 850 tin
?
?
Fiat 124 alloy or tin
Front susp. Transverse leaf spring, anti-roll bar Unequal A-arms. concentric coil springs, anti-roll bar
Rear susp. Semi-trailing arms, coil springs, anti-roll bar
Battery location Luggage compt. std. Fiat 850 ? ? On right side of engine mount
Radiator
Driven fan on waterpump
?
?
Front with electric fan, rear filler tank
Heater Mounted at nose with long ducts
?
?
Behind radiator
Fuel filler
Left interior of engine compt.
?
?
Upper left rear 1/4 panel-exposed
Fuel tank
Std 7.9 US gallon
?
?
std 7.9 US gallon
opt ?
Wheels
5 1/2" deep offset steel (round holes) or various magnesium alloy
?
?
5 1/2" deep offset steel (tri-oval holes) or Campagnolo magnesium alloy
Seats Low-back buckets High-back buckets head rest added
?
?
Low-back buckets
Gauges 2 small and 2 large 3 small & 2 large
?
?
2 small and 2 large
Light/wiper switches In center dashboard pot At left corner of dash
?
?
In center dashboard pot
Control pedals
moved 4" to rear, no footrest
?
?
Special & with left footrest
Steering wheel
Alloy / leather (small) Ferraro
?
?
Abarth 3-spoke alloy/leather
Ash tray In front of shifter None ? ?
In front of shifter
Body* Steel (with glassfibre doors) ? ? Steel with glassfibre doors, aluminium bonnet and engine compartment
Steel
Weight 12 cwt ? ? 12 cwt
14 cwt
Length 11 ft 10 in ? ?
11 ft 10 in
Width 4 ft 10.2 in ? ?
4 ft 10.2 in
Height 3 ft 6 in ? ?
3 ft 6 in
Ground clearance 4.5 in ? ?
4.5 in
Bumpers None Nickle plated or fiberglass ? ?
None in front, trim strip in rear
Grille opening Slit in nose ? ? Slit in nose, 3 more openings below
Engine lid 3 individual louvres ? ? One piece with 10 fore & aft slots

* All models have removable glassfibre tail panels