It's not a different engine. As I recall, they have reduced the stroke length, which is perfectly legal and in line with the rules. By reducing the stroke, they reduce the amount of cc's in the engine. Thus, 5.5 liter. Ferrari did something similar to the F430, which allowed them to have a different restrictor or amount of fuel carried or something like that.
Corvette have no waivers. Quit trolling.
And in theory, BMW COULD enter the Z4. The only reason they didnt was lack of money, as well as a competent team to run them.
Read the tech regs before replyng and if youre too lazy not to know a Le Mans team and don't know where to get them here you are.
ENGINE
The original engine shall maintain its original location,
orientation and position. However it can be:
• lowered in compliance with the Article 5.1.2. below;
• moved backward (*) provided the chassis and the
dimensions of the cockpit are not modified ;
(*) This modification is permitted only for cars produced in
more than 2500 units (with identical external general lines of
the bodywork) in twelve consecutive months. It must be
homologated.
It is permitted to change the engine mountings but without
modifying :
• their position excepted when the engine can be moved
backward (see Art. 5.1.1. above);
• the main structure which may be reinforced in the
mountings area.
Only for cars with a "transaxle" transmission system, the torque tube may be removed and replaced with additional engine and/or transmission supports. The new supports must be homologated as well as the local modifications to
the chassis / bodyshell necessary for their fitting.
If a mean of propulsion different that an internal combustion
engine is considered, it needs to be used directly from serial
car without any modification.
Modifications
The adding of material to the cylinder block or cylinder
head(s) is not permitted. Intake and exhaust manifolds are
free but they must be supported on the original cylinder head
gasket face.
Cylinder heads may be modified by machining, provided that
the original part remains identifiable. The valve tappet
guides may be fitted with sleeves if not originally. The
cylinder block may be modified by machining :
• for the modification of the bore or for sleeving if the original
block is not fitted with sleeves.
• below the horizontal plane passing through the axle of the
crankshaft bearings for the mounting of the dry sump.
The material of the engine sleeves is free.
The oil sump is free and may include the crankshaft bearing
caps.
The elements fixed on the cylinder block and cylinder
head(s) (crankshaft, connecting rods, pistons, camshafts,
intake manifold, etc. ) are free but they must be in
compliance with the Articles 5.2.1. to 5.2.4. above. The
weight of the crankshaft must not be less than more than
10% from the original (titanium forbidden).
Are forbidden save on the road car available for sale:
• Variable valve timing (*)
• Variable length/diameter inlet systems (*)
• Direct injection (*)
• Variable geometry turbo/superchargers (*)
• Titanium apart from connecting rods, valves and valve
retainers, heat shields
• Magnesium apart from standard production mechanical
parts which are described in the ACO Homologation Form
• Ceramic components
• Carbon or composite materials, except used in clutches
and non stressed covers, lids or ducts.
(*) These devices cannot be modified, but they can be
neutralised or removed.
A mechanical system is not mandatory between the throttle
pedal and the fuel supply control system (air and/or fuel) of
the engine.
If the original car is fitted with a system without a mechanical
linkage, the principle of this system may be retained.
If the original car is fitted with a mechanical linkage, the use
of pneumatic or hydraulic equipment is not allowed.
It must be fitted with one or more air restrictors made from
metal or metal alloy the diameter of which is kept at least 3
mm in length (Technical Regulations : Appendix 1).
Restrictors must be
- 600 mm maximum forward the centreline of the first cylinder.
1000 mm maximum apart (centre of the restrictors) on the
cars with the engine in the front..
- fitted so that they can be easily removed for possible
checks.
Air tightness must be total in all circumstances. If the air box
includes several parts, they must be put together in an
efficient way and the design shall be homologated.
No pipe containing air is permitted to come into or to exit
from the air box(es).
Its internal total volume, measured from the control diameter
of the restrictor(s) to the intake ports on the cylinder head(s),
must not be greater than 50 dm3.
Blockage of the restrictor(s) must lead to stall the engine
immediately. The depression measured in the air box when
the engine stop (engine rev= 0) must be:
- equal to the atmospheric pressure at the place where the
test is carried out – 150 millibar during the first half
second;
- equal to the atmospheric pressure at the place where the
test is carried out – 100 millibar during the second half
second;
- equal to the atmospheric pressure at the place where the
test is carried out – 50 millibar during the third half second;
A standard connection “Dash 3 male” is mandatory on the air
box for the junction of the data recording system of the
organizer (see appendix 1). The diameter of the air outlet
must be 2.4 mm (3/32”
minimum. This connection must be:
- easily accessible;
- outside the air flows above the induction trumpets;
- preferably facing the air intake(s);
- Sealed when the data recording system of the organizer is
disconnected;
Any faulty functioning is the Competitor's responsibility.
Turbocharged / Supercharged engines
The displacement is 4000 cc maximum.
A compressor and/or turbocharger may only be used if such
systems are fitted to the road car homologated.
With the exception of exchangers and pipes between the
supercharging device, the intercooler and the manifold, the
whole original supercharging system must be retained and
not modified.
It is authorised to remove the supercharging system.
The inlet system must be fitted with one (or more) air
restrictor(s) made from metal or metal alloy the diameter of
which shall be kept at least 3 mm minimum in length. All the
air feeding the engine must pass through these restrictors.
That cone shall have a mandatory opening angle of 7°
minimum ;
To each end of the cone, over a 10 mm maximum length, a
round shape is permitted to join up to the diameter of both
the restrictor(s) and the charging device inlet.
Supercharged cars must not be equipped with any device
which allows the boost pressure, or the electronic
management system controlling the boost pressure, to be
adjusted while the car is in motion.
Variable diameter inlets and adjustable internal vanes on
turbochargers are forbidden. If the original car is fitted with
such a system, this system must be neutralised or
dismounted.
Intercoolers may be replaced but their number, their types,
their locations and their positions must remain original.
However, any modifications carried out to accommodate a
different intercooler must not alter the structural integrity of
the car and the bodywork.
Apart from intercoolers, any device, system, procedure,
construction or design the purpose and/or effect of which is
any decrease whatsoever of the temperature of the intake air
and/or of the charge (air and/or fuel) of the engine is
forbidden.
The pipes between the supercharging device, the intercooler
and the manifold are free, but their only function must be to
channel the intake air.
The pipes for channelling air to the exchangers are free, but
they must be made from fire-resistant, fibreglass based
composite material.
Internal and/or external spraying or injection of water or any
substance whatsoever is forbidden (other than fuel for the
normal purpose of combustion in the engine).
The method of cooling, the number and the location of the
water radiator(s) must be retained.
The exhaust system is not permitted to protrude beyond the
perimeter of the car as viewed from above.
The exhaust system must be correctly insulated from the
cockpit.
As long as the main parts of the main structure are not
concerned, the underbody and the front and rear bulkheads
may be modified to allow the installation of the exhaust
system and its insulation from the cockpit :
These modifications (limited) need to be homologated.
The sound emitted from each car will must not exceed 110
dbA during the qualifying practices and the race. The
measurement will be made at 15 meters from the edge of
the track.
There's all your engine regs only talks about materials being free not that you can adjust the bore and stroke.
Also
The "Le Mans" Grand Touring Endurance car ("LM" GTE) is
a car having an aptitude for sport with 2 doors, 2 or 2+2
seats, opened or closed, which can be used perfectly legally
on the open road and available for sale thanks to the dealer
network of a manufacturer recognised by the Endurance
Committee.
This category includes two groups:
• A group destined more especially to professionals
(LMGTE-PRO)
• A group destined only to amateurs (LMGTE-AM).
To be equipped with an engine used in a production car and
made in a quantity of at least 300 units.
For each car entered in a race, a minimum of 9 road cars
identical to the model homologated by the ACO must be
produced. It is for the Manufacturer to inform the ACO about
the development of the production.
Last time i checked Chevy don't do a 5.5 litre engine also as its based on the ZR1 and you said it complies with the rules i look forward to you posting the link to the 18 5.5 litre ZR1's
or do you fancy staying under your troll bridge?
Kinda reminds me back in the 60's enzo had to build 100 250 gto's to race at lemans and he just wrote a letter to the FIA saying he had built them and they believed him.
, don't get me wrong, they are a challenge but Peugeot seemed much tougher, gosh I wish they come back 
.
I've not said waivers are bad people were asking why the Corvette and Viper were doing so badly and i was responding to that, that they didn't meet GTE Specs therefore have to carry penalties which is why they are slow compared to previous years. People ask a question and i was letting them know then answer, same as me asking a question and someone letting me know the answer.
