The L34 was an option code for the LH SLR Torana "Bathurst Special" in 1974. The name L34 is derived from the engine code from the heavily modified Torana. L34 Motor Specs - Special Repco cast block similar to the Formula 5000 castings, fully grooved main bearings, solid skirt pistons, heavy duty conrods(L34 rods)with larger rod bolts, strengthened mains caps, ported and polished head with 1.95" inlet and 1.60" exhaust, dual coil/dual point ignition, exhaust headers, balancer retaining plate.
The 1974 LH torana was the first "factory" vehicle to be fitted with a high performance V8 engine, these models were coded as the "SL/R" and "L34" options. The SL/R 5000 was to replace the XU-1 and the L34 high output option was the race version for bathurst.
Along with the engine modifications,the L34 package consisted of larger, HQ type front disk brakes and a front crossmember that gave two mounting positions for the upper front control arms( extra mounting holes 3/4" lower than standard ).
The L34 option package was not sold in the LX series cars. Instead, from September 1977, a package coded A9X was added to both the SL/R 5000 series and the 5-litre SS hatches.
"GMH never publicly released the actual performance of this engine, manufactureres were very high-horsepower sensitive after the debate in parliament about high performance cars being available for road use"
Std. L31 engine for LH Torana = 240bhp
L34 High Output Package ~= 350bhp
Part numbers for L34 head. 9936482.
With roller rockers. 9936382.
* the L34 heads in these pictures are fitted to MrHQGts' HQ Gts Coupe and yes....
they do go very very well!!!