Det här hitta jag:
Pontiac 400 :
400
For 1967, Pontiac introduced the 400 in³ (6.6 L).
The'400'V8 was essentially a bored-out 389 with 4.121 inch bore and 3.75 inch stroke (104.7 mm by 95.3 mm). It replaced the 389 in 1967 and remained in production through the 1979 model year.
The 400 was the only engine installed in '67-69 Pontiac GTOs. It was also the biggest engine available in '67-'69 Firebirds. The 400 was a popular performance option for many of Pontiac's cars. The 400 engine produces a good balance of low end torque and higher RPM horsepower.
In 1967 the cylinder head design was improved for all engines. The valve angle was changed for better breathing. 1967 was the last year for closed chambered heads. The "670" head was a '67-only casting, and the last PMD head to have a closed chamber. Pontiac went to open chambered heads in '67 to improve power, engine breathing and emissions. The valve size increased as well, to 2.11" intake and 1.77" exhaust valves on high performance heads. Low performance and 2bbl applications got 1.96" intake and 1.66" exhaust valves.
Chevy 400 :
400
A 400 in³ small-block was introduced in 1970 and produced for 10 years. It had a 4.125 inch bore and a 3.75 inch stroke. Initial output was 240 hp. While popular with circle-track racers, the engine was prone to cooling troubles if cylinder heads from other blocks were fitted without proper modifications. The 400 produced a lot of torque at low RPMs compared to the other displacements and was used primarily in pickup trucks and the large B-cars (Caprice/Impala) but also found use in Vans. The 400 was eventually discontinued due to its inability to meet EPA emission regulations in place in the early 1980s.
The 400 was unique compared to all other displacements for 3 reasons:
Due to the siamesing of the cylinder bores in the casting - there was no space between adjacent cylinder liners - this block was rather rigid and not prone to the cylinder bore flexing of the other displacements.
This block used a much larger 2.65 inch main bearing assuring that crankshafts from all other blocks would not fit without special oversize bearings.
This is the only small-block that used a 5.56 inch long connecting rod compared to the 5.7 inch connecting rod in all other displacements.
The 400 came with 4 bolt main bearings in 1971 and 1972 only.
While Chevrolet never produced a factory performance version of the 400, it is highly sought out among racers who participate in the very popular 406 racing class - so named for the displacement created by a minor overbore. Destroking a 400 block with a 350 crankshaft creates a 377, a popular combination for dirt track racers. 400 blocks are nearly impossible to find as salvage today and as such the racing market is fed by 3rd party manufacturers who offer improved versions of the block.
Mvh:Sam
Lite farligt det dära. Tänk i fall om det hade vart en 350 eller något liknande fast jag säger att det är bigblock
