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MOPAR 340 ENGINE SERIAL NUMBERS MANUAL
MOPAR 340 ENGINE SERIAL NUMBERS SERIES
MOPAR 340 ENGINE SERIAL NUMBERS FREE

It was fun while it lasted – in ’72, the tightening noose on performance found compression down to just 8.5:1 and more restrictive 360-type J heads - the 340, in ’73 came to an end - though the ThermoQuad remained in place, perking up the smog laden HP 360 4bbl in ’74 and ‘75. Even with a slight drop in compression in ’71 and with the help of the new ThermoQuad, NHRA quickly realized the carb was a big plus, and ’71 340’s got a 30hp bump over previous index’s. The AVS did not pass the new emission tests for ’71, while the 800cfm ThermoQuad - with its 1 3/8” primaries - passed. Carter brought out its resin-bodied ThermoQuad in the late ‘60’s and soon found a home in 340’s starting in ’71. Prior to ’71, the 340 came standard with the Carter AVS, rated at 650 cfm.

new version of emissions canister utilizedĮver since the 340 was introduced in 67 for 68 cars, they always carried the Carter line of carburetors.

white & blue 'Mopar' air filter service decal replaces.

Warm air flap under air cleaner discontinued.

last year for 340, virtually unchanged from ‘72.

All heads now received hardened seats for new unleaded gas.

introduction of ‘360 style’ J head (915’s) – a.k.a the ‘O’ and ‘U’ heads.

MOPAR 340 ENGINE SERIAL NUMBERS MANUAL

Manual shift 340's then a little later automatic versions

late year – partial introduction of Electronic Ignition (May 14th), first on.

Service decal replaced previous yellow version

with introduction of blue engines, the new white with blue 'Parts' air filter.

compression dropped to 10.3:1 due to new emission laws and upcoming.

valve covers now had wire harness tabs, not the tray/trough.

Transition and helped lower emission readings with smaller 1.38" Introduced - offering more throttle response & better low to mid range

Carter 800cfm ThermoQuad spread bore carburetor.

Stream-lining wasĪ large part to this move with all engines now blue.

engines started Hemi Orange but changed toĬorporate blue in April '71 when they changed plantsįrom Windsor to Mound Road, MI.

Here's a look at the year-by-year chronology of the 340. With that said - anyway you look at this feisty little small block, it performed.

As well, remember, the new for '71 800cfm ThermoQuad was still bolted to the dual plane intake, which made them healthier than the 650cfm AVS carb from earlier models. Even the net rated 240hp 340's from '72 & '73 would have still been pushing 285bhp at the crank. Those initial numbers were instantly challenged, with the NHRA raising the stock index to 310bhp and all the magazines stating 'underrated' 275 horsepower. The horsepower rating was set by Chrysler at 275bhp thru to '71, but with the '72's being detuned slightly to 240 net bhp. Coming off the starting blocks in the Dart GTS and Formula S Barracuda's, the 340 made everyone stand up and pay attention. Horsepower stayed consistent throughout it's life, from '68 to '73, but not without a couple blips along the way. These engines were built to perform, and stay together at upwards of 6,500rpm!

MOPAR 340 ENGINE SERIAL NUMBERS FREE

Look at the stats – high compression (10.5 until '71), big valves (2.02 intake, 1.60 exhaust until '72), bumpy cams, double-roller timing chain, forged and shot-peened crank and rods, windage tray, free flowing dual exhaust, dual plane intake manifolds and large 4 barrel carburetors. the all new for ’68 340 was based on the standard LA-series lightweight block and was designed from the outset as a performance engine. One of the most popular performance engines in the '60's and '70's. With this website built for the ultra rare Canadian order '71 & '72 Swinger 340 Specials, this page hi-lights the peppy 340 that powered these cars. ****Schinznach hand built for Swiss Mrkt (approximate #s)Īll numbers courtesy: Galen V.

MOPAR 340 ENGINE SERIAL NUMBERS SERIES

**Australian order '72 / '73 - Bathhurst Racing Series * Canadian Swinger 340 Specials '71/ '72 Western Canada