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Small Block
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Small Block
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Set of 8 forged connecting rods in 4340 steel for Chevrolet Small Block V8.
Launched in late 1954 for the 1955 model year, the Chevrolet Small Block was General Motors’ first overhead-valve V8, introduced on the Corvette and the Bel Air under the "Turbo-Fire" name. With an initial displacement of 265 ci (4.3 L), this 90° cast-iron block runs on five main bearings, uses a pushrod-operated OHV valvetrain with two valves per cylinder and pairs a 3.75" bore with a 3.00" stroke, good for up to 195 hp in four-barrel form. Light, compact and cheap to build, it permanently established the V8 layout at Chevrolet.
Over the years displacement grew from 265 to 400 ci (6.6 L), passing through 283 ci (4.6 L), 327 ci (5.4 L), 305 ci (5.0 L) and above all the 350 ci (5.7 L), launched in 1967 and now the brand’s benchmark. It powered everything from the Corvette to the Camaro, Chevelle, Nova and C/K pickups, and was adopted by nearly every GM division. Built in more than 90 million units, from carburettor to fuel injection, this first-generation Small Block stayed in service until the early 2000s before giving way to the LT and then LS families.
Machined from forged 4340 steel, these reinforced connecting rods replace the factory rods, usually sintered, whose mechanical safety margin runs out as soon as power rises. Forging aligns the metal grain flow and removes internal porosity: for an equal section, the rod withstands far higher alternating loads without creep or crack initiation.
Designed for built engines, both high-output naturally aspirated and forced-induction, they secure the reciprocating assembly during high-rpm operation and under strong boost pressure. They are found in drift, drag, rally, on track, in hillclimb and time attack, each discipline loading the rod well beyond what the manufacturer originally intended.
| Reference | Brand | Profile | Bolts | Pin diameter OEM 23,55 mm | Small-end width | Big-end diameter OEM 56,52 mm | Big-end width | Center-to-center | Weight per rod |
|---|---|---|---|---|---|---|---|---|---|
| R-SBC-002-I | ZRP | I | ARP 2000 | 23.55 mm | 56.52 mm | 23.88 mm | 144.78 mm | 570 g | |
| R-SBC-002-I-L19 | ZRP | I | ARP L19 | 23.55 mm | 56.52 mm | 23.88 mm | 144.78 mm | 570 g |
| Rod | Bolts | Torque | Recommended stretch |
|---|---|---|---|
| ZRP (R-SBC-002-I) | ARP 2000 | ||
| ZRP (R-SBC-002-I-L19) | ARP L19 |
The manufacturers’ reference remains the stretch-gauge method: when in doubt, the instructions supplied with the kit always take precedence. The stated torque figures apply to assembly lubricated with ARP grease.
| 4340 is a low-alloy nickel-chromium-molybdenum steel, as common in aerospace as in motorsport. Forged then heat-treated by quenching and tempering, it combines high tensile strength, excellent fatigue life and real ductility. Compared with a factory rod, usually sintered and sized for production cost, a forged 4340 rod gains around +19% in yield strength, +8% in tensile strength and, above all, +19 to +37% in fatigue strength, i.e. a service life under cyclic load several times higher. This is exactly why forged 4340 becomes essential as soon as rpm and boost climb. |
 | I-beam profile. Its slimmed central section cuts mass: less inertia, sharper rpm pick-up and lower stress on the bolts. It is the preferred profile on heavily worked V8s such as the built Small Block, where a light assembly is wanted without giving up strength. |
The rod bolt is among the most heavily loaded parts of the engine. The key is to match the ARP grade to the real use of the build, then follow the specified assembly torque and stretch to the letter.
 | ARP 2000 (tensile strength ~220,000 psi, i.e. ~1,517 MPa): this is the high-performance standard. Suited to builds up to 200 hp per cylinder in 3/8" and up to 8,500 rpm, it dominates track, trackday, drift, rally, drag and hillclimb use. It is valued for its strength, reliability and versatility, with no particular storage precaution. |
 | ARP L19 (tensile strength ~260,000 psi, i.e. ~1,793 MPa): it targets engines pushed to the extreme, up to 250 hp per cylinder in 3/8" and up to 10,000 rpm, under very high boost, sustained high rpm and high cylinder pressure. It is the choice for big power in drag, drift, rally and track. In return, sensitive to corrosion and hydrogen embrittlement, it must be fitted and stored oiled, away from moisture. |
| Beyond torque tightening, measuring rod-bolt stretch is the most reliable check for reaching the target preload. It is done with the bolt fitted: place the dial gauge on both ends of the bolt and read the actual stretch, which must match the specified value (see the torque and stretch table above). By removing the friction variations inherent to torque tightening, this method secures the assembly of heavily loaded engines. |
 | ZRP is a Greek brand of high-performance forged connecting rods founded by Alex Drakos in Athens. Each rod is forged from 4340 steel, precision-machined and balanced to ±1 g to stay reliable at high rpm. Offered here in I-beam profile with ARP 2000 or ARP L19 bolts, they are designed and inspected in Greece, then proven in rally, on track and in drift. |
 | 1) Small end 2) Small-end diameter 3) Rod beam 4) Rod bolt 5) Big end 6) Rod nut / bolt 7) Rod cap 8) Big-end diameter 9) Center-to-center |
These forged connecting rods are compatible with the entire first-generation Chevrolet Small Block V8 family, from 265 to 400 cu in:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Chevrolet | Corvette, Bel Air | 265 cu in (4.3 L) | 1955–1957 | |
| Chevrolet | Impala, Bel Air, Corvette | 283 cu in (4.6 L) | 1957–1967 | |
| Chevrolet | Corvette, Chevelle, Nova | 327 cu in (5.4 L) | 1962–1969 | |
| Chevrolet | Camaro, Corvette, C/K | 350 cu in (5.7 L) | from 1967 | |
| Chevrolet | Caprice, Monte Carlo, C/K | 400 cu in (6.6 L) | 1970–1980 | |
| Chevrolet | Camaro, Monte Carlo, C/K | 305 cu in (5.0 L) | from 1976 |
OEM reference:
When a factory bottom end lets go, a broken, bent or twisted rod, returning to the manufacturer’s configuration means replacing rods and pistons, almost always damaged together. The bill for a mere repair then rises very fast.
For a comparable budget, sometimes even lower, pairing forged 4340 steel rods with forged pistons brings far greater reliability and safety margin, plus real room to increase power. This is the route chosen by European engine builders for more than fifteen years.
For the same budget: more reliability, more potential, more longevity.
