HP Austin Healy Sprite/ MG Midget 1275 Induction Change Request
#40213 from Michael MILLER · Rule change · TB 26-06 (2026-06 Fastrack)
In HP Spec Lines, Austin-Healey Sprite Mk I, II, III, IV MG Midget Mk I, II, III, IV & 1500, change Drivetrain Notes as follows:
"(2) 1.25” SU w/ no modifications
(2) 1.5” SU w/ no modifications (on alternate manifold)
Valves: (I) 33.0/(1.30) (E) 29.5/(1.16)
Comp. ratio 12.0:1, Valve lift .450”
Trans. Speeds: 4
Drivetrain Level 2 preparation only.
Listed spec line weight does not change with alternate or stock transmission.
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Alternate intake manifold, with narrowed balance tube to fit 1275cc head, permitted with use of 1.5” SU carbs (original P/N’s
12H708, 12H1398, 12H2568)."
In HP Spec Lines, Austin-Healey Sprite Mk I, II, III, IV MG Midget (ALL), change Drivetrain Notes as follows:
"(2) 1.25” SU w/ no modifications
(2) 1.5” SU w/ no modifications (on alternate manifold)
Valves: (I) 33.0/(1.30) (E) 29.5/(1.16)
Comp. ratio 12.0:1, Valve lift .450”
Trans. Speeds: 4
Alternate intake manifold, with narrowed balance tube to fit 1275cc head, permitted with use of 1.5” SU carbs (original P/N’s
12H708, 12H1398, 12H2568)."