Chevy 327/350 block

Are 327 and 350 blocks the same?

The larger sized main journal diameters of the 1968 327 small-block, 2.450, are the exact size of the later 350 small-block. The difference between the two is the length of stroke on the crank, 3.250 for the 327 and 3.484 for the 350.

How do you tell a 327 from a 350?

Measure the stroke. If the stroke is 3.25 its a 307 or 327. If its 3.48 its a 350.

What year is the best Chevy 327 engine?

The potent 327 L84 held the title as the most powerful production small block Chevy engine for nearly 30 years! That’s an impressive feat for an engine developed way back in 1964, especially considering it gave up precious cubic inches to the larger small blocks developed later on.

How much HP can you get out of a 327?

Rated at 375 hp, the fuel-injected 327 was a high-winding screamer, as satisfying to drive as any big-block. At the other end of the spectrum, the 327 was also offered at much more pedestrian power levels, as low as 210 hp (gross).

Will 350 heads fit on a 327 block?

Bill, 350 heads will work on your 327. Avoid 305 heads like the plague, though. You will want to find some with similar size combustion chamber and valve size/port size in order to keep at least the same power output your 327 had when new.

Will 327 pistons fit in a 350?

350 pistons will need a 3.480 stroke crank. A large journal 327 block is the same as the 350 when you change the crank.

How can you tell if a 327 block?

How Can You Tell If A 327 Block? It has a 25-inch crank, which accounts for its 327 horsepower. If your block contains a 3, it is possible for your building. Then you get a 350-degree turn-out.

Is a 5.3 Chevy engine a 327?

325 is close to the correct number. The 5.3L is not a 327 or even close to a 327.

How can I tell if I have a 327?

Check the numbers on the deck that were stamped on the engine right before it went into the car. Look up the 2 or 3 letter suffix to find out what it is and what it left the factory in. Not all engines have these numbers. The engine in my roadster could either be a 327 or a 350 just going by the block casting number.

How high can a 327 rev?

The bottom end of a stock 327 can be safely spun up to 6500 RPM if it is in good shape. A stock 327 with power pack heads and a stock cam will run out of breath above 5000 RPM. The power pack heads have small valves (1.72 intake &1. 50 exhaust), and a stock cam is designed to make power below 4500 RPM.

Did Chevrolet ever make a 327 4 bolt main?

Chevrolet never used a 4 bolt main 327 in there production cars, but sounds like there might be some out there in industrial versions according to silvercab. They did make 4 bolt main 350s, and in ’69 the 302 had 4 bolt mains. Consequentially, the 302, 327, and 350 all had a 4″ bore.

When did Chevy stop making the 327?


The 327 was a mainstay of Chevrolet’s engine lineup from 1962 through 1969, when it made its final appearance as the standard V-8 in that year’s fullsize Chevys, and as a low-cost option over the base 307-inch V8 in the Chevelle, Nova and Camaro.

What is special about the 327?

The high efficiency came from the fact that the 327 block’s large cylinder wall castings allowed four inch bores that could utilize large valve heads. The engine also had a relatively short 3.25-inch stroke that yielded a 1.75:1 rod to stroke ratio when fitted with the standard small-block 5.7-inch small-block rods.

How do I identify a Chevy 327 engine?

Location. The 327 Chevy engine is stamped on a machined pad on the front passenger side cylinder head usually behind the alternator.

How fast is a 327 engine?

The lowest rated 327 made 250 hp at 4,400 rpm and 350 lb. -ft. of torque at 2,800 rpm. The next level of the 327 produced 300 hp at 5,000 rpm and 360 lb.

Is a 327 a good motor?

Is A 327 A Good Engine? This is one of the best engines available, especially since they have been made since 1960. For those who need a reliable engine for a classic car engine swap, a 327 will serve your needs well.

What cubic inch is a 327 bored 30 over?

060 over is 292. 327 . 030 over is 331, .