Hemi Performance Inline 6 Cylinder Performance & Engine Parts

Hemi 6 engine parts & performance

The Hemi Chrysler 6 engine is a inline six cylinder petrol engines produced by Chrysler Australia in three displacements 215, 245 & 265 cubic inch the Hemi 6 was produced in many configurations including single barrel carburettor, 2 barrel carburettor 4 barrel carburettor & triple DCOE side draft Webers on the 6 pack chargers.The Hemi six cylinder engines were installed in Australian-market Chrysler Valiants from 1970 through 1981 being used in family sedans including the Valiant Ranger, Valiant Regal, Valiant Pacer, Valiant Charger. The Hemi 6 was used in utes, panel vans, light & heavy trucks & taxis, The South Australian Police Force used Chrysler Valiants as patrol cars as did many other Police forces in other states of Australia.

Chrysler in the USA had been working on an engine to replace the G series { Slant 6 } In Dodge trucks, After working on the project for many years it was canned. With Chrysler Australia wanting to move away from the Slant 6 225 Valiant engine they continued the project & took over from the USA engineering department & in 1970 when the VG model Valiant was released it was powered by the {4.0L} 245 Hemi six cylinder

Hemi_6_cylinder_Motor

The Hemi 6 does not a true hemispherical combustion chamber The true "Hemi" was produced by Chrysler USA in the 1950s to1970s This is often called the American Hemi V8 engine.

The Hemi 6 uses a non cross flow design cylinder head, meaning the intake and exhaust ports are on the same side of the engine.The Hemi 6 cylinder engine uses a 7 main bearing crankshaft that has a reputation for excellent performance, economy, and durability. The Hemi 6 & Slant 6 Chrysler engines really only share the same family name as none of the major components like the cylinder head, engine blocks, crankshaft, camshaft, con rods, oil pump, valve cover, rocker gear, harmonic balancer, timing cover, intake or exhaust manifolds are interchangeable.

Hemi 6 Engine Identification

By David Mizen

The engine number can be found next to the distributor.

First Digit:
All Valiant Hemi engines have a "D" prefix. Chrysler Centura Hemi engines have a "DF" prefix.

Second Digit:
The second digit refers to the size

DIGIT	SIZE
1	215
2	245
3	265

Third Digit:
The third digit refers to the performance level

DIGIT	PERFORMANCE LEVEL
1	Low Compression
2	Standard Performance (1 BBL)
3	High Performance (2 BBL)
4	Premium Performance (Pacer, R/T & 770)
5	Six Pack (E37 & E48)
6	Six Pack (E38 & E49)

Fourth Digit:
The fourth digit refers to the gearbox type

DIGIT	GEARBOX TYPE
1	Auto
2	3 speed manual
3	4 speed manual

Fifth Digit:
The fifth character is the year of manufacture.

DIGIT	YEAR OF MANUFACTURE
A	1970
B	1971
C	1972
D	1973
...and so on...

Remaining Digits:
The remainder of the digits gives you the sequential build number.

When it comes to performance modifications to your 6 cylinder Hemi you want the best. Why would you want to use products that are out dated in the design when for a few dollars more you can have the best. No matter if you are restoring an early model Valiant or Chrysler to original condition or building a High Performance Hemi 6 take the time to check out the products below

Chrysler Hemi 245, 265 6 Cylinder 2 Barrel & 4 Barrel Performance Manifolds

Released by Aussie Speed in 2009 the AS0245 2 barrel Hemi performance inlet manifold & the AS0265 4 barrel performance manifold. These new style Performance intake manifolds offer a balanced intake runner system with a flow variation under 2% on all 6 port runners, unlike the old AS0018 & AS0019 Cain Hemi style Manifolds that was reproduced by AussieSpeed & suffered distribution problems due to the carb being located directly along side of cylinders 3 & 4 making tuning difficult to obtain the correct AFR readings on all 6 cylinders. The New AS0245. 2 barrel & AS0265. 4 barrel manifolds by Aussiespeed looks to have a shorter centre runner but in fact is longer due to the reshaped high velocity plenum, Both of the new AussieSpeed Hemi six manifolds have a far smaller plenum cross section across the manifold. Feedback from customers have seen the same manifold in both 2 & 4 barrel been used on mild street engines to all out high revving & turbo charged engines, drag race motors, speedway saloon cars & bitumen circuit racing cars. The new style manifolds are designed around the same principle as triple Weber DCOE & SU side draft carburettors that feed 1 or 2 cylinder per carburettor. The multiple carb engines delivered an even charge to all cylinders. The new AussieSpeed Chrysler Hemi 2 & 4 barrel manifolds can offer power gains close to that of multiple carb induction with out tuning & linkage hassles, fit in smaller engine bays, far cheaper to buy tune & set up, can be used with throttle body style fuel injection or nitrous oxide as the bosses are cast into the manifold.

AS0245 Chrysler Hemi 2 Barrel Hemi Manifold. To View Pricing or more information click on the image above

AS0265 Chrysler Hemi 4 Barrel Hemi Manifold. To View Pricing or more information click on the image above

Hurricane Hemi PP&R AussieSpeed Long Runner E34 Style 4 Barrel Manifold AS0089

The PP&R {Pentastar Parts & Restorations} located in Sydney NSW & AussieSpeed have worked together to bring Valiant owners the long runner E34 style long runner Performance intake manifold. The Hurricane Hemi V3 manifold offers great performance if a long runner manifold is required. The PP&R AussieSpeed hurricane manifold offers fuel injection & or nitrous oxide bosses, open large plenum to suit Holley Square Bore 4150 & 4160 vacuum & double pumper carbs in a north south position. This manifold is not recommend as a standard replacement manifold & should only be used on high performance engines. to get the full benefits you will need improved exhaust system & extractors, high performance cam & extensively modified cylinder head.

AS0089 Chrysler Hemi Hurricane Long Runner Manifold. To View Pricing or more information click on the image above

Cheap Hemi 6 Power Upgrade if using a Cain Hemi Manifold

AS0084 AussieSpeed Plenum Pig

Valiant owners using the Cain Hemi 4 barrel manifold or the John Cain Hemi Manifold on 6 cylinder Hemi 245 & 265 engines may not be aware that even though they produced good power & offered great improvements over any of the factory cast iron or modified 2 barrel to 4 barrel conversion that offered a boost for 6 cylinder Hemi Performance power hunters. all of the manifolds suffered from the same thing, even distribution to all 6 intake runners. With so many of the Cain Hemi manifolds being used & as the first AussieSpeed AS0019 4 barrel was very simular in design while developing an engine with a customer we started to play with plenum sizes & staggering jetting we found we could make alot more torque down low & actually still make the same & eventually more horsepower & torque at the top end with lower RPM. Our engine was a good tough little 265 with nothing special except for raised compression, Crow solid cam with 244 duration@ 50, ported cylinder head with more time spent on the short turns & bowl area under the valve. After the initial breakin & a few ramp runs the oil was changed, rockers were adjusted a fresh set of plugs & the horse power figures were in the low to mid 270 HP & 260 odd foot pounds of torque. With every thing warm & looking good it was time for a WOT run when leaned on hard the engine made 277 HP & 268 foot pounds of torque. over a period of time the changes were made to the plenum & with a close eye kept on exhaust temperatures we found that things were evening out & this was allowing us to make better use of the advance curve in the distributor. We realised that we were making some gains & after many different shapes & sizes were tried with some gaining HP & Torque & some loosing it we cracked 300 horse power. we added extra material to the bottom of the plenum pig & bingo the little Hemi 6 made 304.4 HP & 300.2 ft lbs of torque.The other great thing was we made alot more torque at lower RPM & it still made power through till 5800 rpm.

So with the AS0084 AussieSpeed Plenum Pig fitted the HP figures went from 277 HP to 304.4 HP & torque from 268 ftlbs to 300.2.ftlbs.

To view more on the AussieSpeed Hemi 6 Plenum Pig Click on the Image Above

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