info on 7.0 litre caddy engines

i.r.o. 400-420hp depending on year, model, etc.

they're a torque motor not hp, torque is over 500ft/lbs.

theyve very heavy though, like all big blocks. theyll easily twist things in half and blow axles though

Redesigned OHV
For the 1963 model year Cadillac updated their V8 engine, modernizing the tooling used in the production line while optimizing the engine's design. Although it shared the same layout and architecture with the 1949-vintage engine, the revised engine had shorter connecting rods and was one inch (25 mm) lower, 4 inches (102 mm) narrower, and 1¼ in (32 mm) shorter. The accessories (water pump, power steering pump, distributor) mounted on a die-cast aluminum housing at the front of the engine for improved accessibility. An alternator replaced the former generator. The crankshaft was cored out to make it both lighter and stronger. The revised engine was 52 lb (24 kg) lighter than its predecessor, for a total dry weight of 595 lb (270 kg).

390
For 1963 the revised engine shared the same 4.00 in (101.6 mm) bore and 3.875 (94.4 mm) stroke of its predecessor, for an unchanged displacement of 390 in³ (6.4 L). Power was unchanged at 325 hp (242 kW), as was torque at 430 ft·lbf (583 N·m).

429
For 1964 the engine was bored to 4.13 in (104.9 mm) and stroked to 4.00 (101.6 mm), raising displacement to 429 in³ (7.0 L). Power rose to 340 hp (254 kW) and torque to 480 ft·lbf (650 N·m). The 429 was used through the 1967 model year.

World's largest
Although the modernized engine was compact and light for its displacement and output, 429 in³ represented the limit of the original architecture's expansion, and it had been surpassed by Chrysler's 440 and Lincoln's 462. As a result Cadillac introduced an all-new engine for 1968.

472
At introduction, the new engine had a 4.30 in (109.2 mm) bore and a 4.06 in (103.1 mm) stroke for a displacement of 472 in³ (7.7 L). It delivered 375 hp (280 kW) @ 4400 rpm, and a massive 525 ft·lbf (712 N·m) torque, produced at just 3000 rpm. The new engine was about 80 lb (36 kg) heavier than its predecessor. It was used through 1974.

500
For 1970 Cadillac stroked the V8 to 4.304 in (109.3 mm), increasing total displacement to 500 in³ (8.2 L). At introduction it was rated at 400 hp (298 kW), SAE gross, and 550 ft·lbf (750 N·m) of torque. For 1971 compression was reduced from 10:1 to 8.5:1, reducing power to 365 hp (gross) or 235 hp (175 kW) in the new SAE ratings. By 1976, its final year, it had fallen to 190 hp (142 kW). It held the title of the largest-displacement production engine ever offered in a passenger car by a US automaker until 2003, when Dodge introduced the third-generation of their Dodge V10 now at 505 in³ introduced in the Dodge Viper SRT-10, but the 8.2 L (500 in³) is still the largest V8 ever used in a production car.

Downsized OHV
The market of the 1970s forced Cadillac to downsize its vehicles and engines. While the Cadillac Seville used a 350 in³ (5.7 L) Oldsmobile V8 engine, Cadillac also began work on smaller proprietary engines.

425
In 1977 Cadillac introduced a new 425 in³ (7.0 L) V8, based on the architecture of the 472, but with a smaller, 4.08 in (103.6 mm) bore and 4.06 in (103.2 mm) stroke. The new engine was also 100 lb (45 kg) lighter.

The 425 was offered in L33 form, with a four-barrel carburetor, producing 180 hp (134 kW) @ 4000 rpm and 320 ft·lbf (434 N·m) of torque at 2000 rpm, and L35 with electronic fuel injection for 195 hp (145 kW); torque was the same, but peaked at 2400 rpm.

The 425 was used through 1979 on all Cadillacs except the Seville.

368 and V8-6-4
In 1980 the 425 was replaced with the L61, which was the same basic engine de-bored to 3.80 in (96.5 mm) for a total displacement of 368 in³ (6.0 L). The reduction in displacement was largely an effort to meet CAFE requirements for fuel economy. Fuel injection (which would be known to GM as throttle-body injection after 1985) was now standard except for Fleetwood Limousines and Commercial Chassis.

Cadillac refers to the fuel injection system as digital fuel injection; this particular induction system was later adopted by other GM division except Oldsmobile V8s.

Power output dropped to 145 hp (108.2 kW) @ 3600 rpm and torque to 270 ft·lbf (366 N·m) @ 2000 rpm. This engine was standard on all Cadillacs except the redesigned Seville, where it was optional.

One big torque monster. Think of the car it was designed to haul... You can tune them well. If its a 425 its useful. The old 429 maybe less so. Also the older 390s some of them have one-year-only parts which makes them a pain to overhaul if necessary...

Not sure if you can actualy get ali heads for a Cad 500. I know Bulldog were tooling up for them but there were some supply issues. I didn't see a resolution tho that one, doesn;t mean there wasn't one.

Small block Chevy is a heavy for a small block but its not the weight of a CAD500. The CSD500 is generally reckoned to be lighter than the big block Chevy, a lot of 4x4 truck racers use them for the torque and they reckon so save a few lbs off the front of the truck

that means the one we had had a curse word 180brake engine. when i get one again, I'm retro-fitting the '70 engine. TEH LAW.

don't forget the '70 engne ie rated SAE Gross and IIRC uses the STP correction factors, whereas engines from 1973 models are SAE Net and use the same correction factors used up to 2006 models. IE are not directly comparible. Also that some dyno cheating was sometimes used in the 1960s and 1970s to make some of the engines appear to develop less power than they did for insurance purposes...

I'd use MTS (MTD?) or Bulldog heads on whatever block you have 425 is as good as any. Really nice castings on all the "real" caddy lumps - no core shift - take big gobs of power without cracking the valleys....

Assuming he has the Bulldog heads it could be comparible to a factory all iron smallblock chevy, but really, who would compare a performance prepped Caddy big block with a stock manifold and head SBC? Its not a "right" comparison in those terms. Put the alloy heads, intake, tube headers, etc on the SBC to make it a fair fight and guess what you lost 150-160 lbs off the weight of the SBC too...

Cad motors rule

it would be an honour to be consulted my friend.

Awesome, g'luck with it! ;D