（7.0 L LS7 engine in a 2006 Chevrolet Corvette Z06）

GM LS engine
http://en.wikipedia.org/wiki/GM_LS_engine
7.0 L
LS7
LS7 can also refer to a 454 over the counter 460+ hp high compression engine Chevrolet Big-Block engine of the 1970s

The LS7 is a 7,008 cc (7.008 L; 427.7 cu in) engine, based on the Gen IV architecture. The block is changed, with sleeved cylinders and a larger 4.125in (104.775mm) bore and longer 4.00in (101.6mm) stroke than the LS2. The small-block's 4.4 in (110 mm) bore spacing is retained, requiring pressed-in cylinder liners. The crankshaft and main bearing caps are forged steel for durability, the connecting rods are forged titanium, and the pistons are hypereutectic. The two-valve arrangement is retained, though the titanium intake valves by Del West have grown to 2.20 in (56 mm) and sodium-filled exhaust valves are up to 1.61 in (41 mm).

Peak output is 505 hp (377 kW) at 6300 rpm and 470 lb·ft (640 N·m) at 4800 rpm with a 7100 rpm redline[citation needed] During GM's reliability testing of this engine in its prototype phase, the LS7 was remarked to have been repeatedly tested to be 8000 rpm capable, although power was not recorded at that rpm level, due to the constraints of the camshaft's hydraulic lifters and the intake manifold ability to flow required air at that engine speed.

The LS7 is hand-built by the General Motors Performance Build Center in Wixom, Michigan. Most of these engines are installed in the Z06, some are also sold to individuals by GM as a crate engine.

After an extensive engineering process over several years, Holden Special Vehicles fitted the LS7 to a special edition model, the W427. The HSV-tuned engine produces 375 kW (503 hp) and 640 N·m (470 lb·ft), making it the most powerful car ever built in Australia. The W427 was unveiled at the Melbourne International Motor Show on 29 February 2008[8] and went on sale in August 2008.

Applications:

・2006–2013 Chevrolet Corvette Z06
・2008 HSV W427
・2014 Chevrolet Camaro Z/28
・Vertical Hummingbird helicopter

LS7.R
The LS7.R engine is a variation of the LS7 used in the highly successful C6.R American Le Mans Series racecar. It was crowned as Global Motorsport Engine of the Year by a jury of 50 race engine engineers on the Professional Motorsport World Expo 2006 in Cologne, Germany.

LS7ベースのチューンド版ですかね。
（427 cu in→474 cu inの排気量アップ）
参考に、国産エンジンと重量のデータ↓


エンジン重量
http://hama-sush-jp.pro/blogorido/entry-11120533475.html
セリカ　　　　　 　　　2ZZ-GE 190ps 115kg 1.66
スープラ(80)　 　　　　2JZ-GTE 280ps 233kg 1.20
フェアレディZ(33)　　　VQ35DE 280ps 180kg 1.56
スカイラインＧＴ-R　　RB26DETT 280ps 255kg 1.10
シルビア(Ｓ15)　　　　SR20DET 250ps 166kg 1.51
NSX 　　　　　　　　　C30A 280ps 205kg 1.37
S2000 　　　　　　　　F20C 250ps 148kg 1.69
ランエボⅧＭＲ　　　　4G63 280ps 164kg 1.71
インプレッサ　　　　　EJ207 280ps 150kg 1.87
RX-7(FD3S)　　　　　　 B13 280ps 159kg 1.76
RX-8(MT)　　　　　　　 B13 250ps 124kg 2.02
RX-8(AT) 　　　　　　　B13 210ps 116kg 1.81

●MR-S　　　　　　　　　1ZZ-FE 140ps 102kg 1.37

追加）
L28E　：　200kgくらい
VR38DETT　：　215kg くらい（R35GT-R）

換算してみると、
400pounds ＝ 181.44kg(アルミブロックのアメリカンV8)
650pounds ＝ 294.84kg(鉄ブロックのアメリカンV8)
共にラージブロック。

474cu.in.(キュービックインチ) × 16.387 ＝ 7767.438cc

単位換算表
http://www.hobidas.com/blog/akimoto/TOOL.html

NA712ps 181.44kg 3.924　

コルベットの速い理由が、解った気がする。
第二期ホンダF1のV12が、これくらいの重さだったかなと思い調べたら違った（笑）
調べたところ154㎏/735bhpですた。
現在はV8で95kgくらいか。軽いね。
LS7は、排気量とパワーを考えると軽く市販品として相当魅力的かも。
（排気量が有るので、吸排気とカムをいじるだけでドカンとパワーアップするかも）
馬力は、7.7リッター700馬力、リッター90馬力なので大したことないですね。
（OHVの2バルブゆえに、DOHCの4バルブに比べるとしかたがない）
OHVは、ヘッドにカムが無いのでエンジン全高が低くなる＝低重心がメリットですかね。

音がNASCARそのままね。
幾らするんだろう。

This is an important new engine for NRE. This NA high output engine puts out great horsepower and torque, yet weighs in at less than 400 pounds. It loves to rev. For more information go to http://NelsonRacingEngines.com. For help getting your product or service to the market place. go to http://VeritasMovieStudio.com. NRE TV Episode 193.

Amazing New NRE 712 HP 474 CI Chevy LS Engine! Under 400 Pounds! Nelson Racing Engines.
http://www.youtube.com/watch?v=J76Htu2vGaM