14102193 Cylinder Head: Facts Every Builder Should Know
14102193 is a genuine GM small-block Chevy (SBC) iron cylinder-head casting used on many 5.0 L and 5.7 L
14102193 is a genuine GM small-block Chevy (SBC) iron cylinder-head casting used on many 5.0 L and 5.7 L throttle-body-injected (TBI) V-8 engines built from 1987 through 1995. Enthusiasts often shorten the number to “193 heads.”
These castings came from the factory with 65 cc ± 1 cc combustion chambers, 1.94-inch intake valves, and 1.50-inch exhaust valves, giving them mild compression on stock 350 ci trucks and marine blocks.
OEM Vehicles and Marine Applications
GM installed 14102193 heads on:
Chevrolet C/K-series pickups (1987-1995)
GMC Sierra and Suburban TBI models
Caprice police-package sedans running L05 350 ci engines
MerCruiser and Volvo-Penta 5.7 L marine packages, especially Mag 350 variants
The broad use proves the head’s reliability under both street and continuous-load marine duty.
Technical Specifications at a Glance
| Spec | Factory Value | Why It Matters |
|---|---|---|
| Combustion chamber | 64-65 cc | Sets static compression ratio |
| Intake valve | 1.94 in | Balances low-end torque with airflow |
| Exhaust valve | 1.50 in | Adequate for 5,000 rpm duty cycles |
| Spark-plug angle | 23° | Matches standard SBC pistons |
| Bolt pattern | 1987-95 center-bolt covers | Simplifies gasket sourcing |
Data comes from GM parts catalogs and verified machine-shop flow tests.
Air-Flow and Performance Potential
Stock 14102193 ports flow roughly 165 cfm on the intake side at 0.500 in lift and 120 cfm on the exhaust. Those numbers make the head ideal for daily-driver torque curves up to 4,800 rpm. Builders seeking more power can:
- Pocket port below the valve seat to remove casting ridges.
- Blend the short-side radius on the exhaust runner for 6–8 cfm gains.
- Gasket-match the intake runner entrance to a TBI manifold plenum, keeping cross-section consistent two inches past the flange.
Experienced porters report 15–20 horsepower improvements while retaining factory valve sizes.
Compression-Ratio Math Made Simple
Because the chamber is larger than earlier 64 cc heads like 462 or 487 castings, you must dial in compression carefully:
- Dish pistons (−12 cc) + 14102193 ≈ 8.5:1 on a 350 ci block.
- Flat-tops (−5 cc) + 14102193 ≈ 9.3:1, a sweet spot for pump gas and RV cams.
- Pop-up domes (+5 cc) can tip past 10:1, risking detonation on regular fuel.
Always cc the chambers and mock-assemble with a 0.041-in head gasket to calculate the final ratio.
Common Upgrades and Compatible Parts
- Valve-train – Stock 1.25-in stamped-steel rockers handle 0.440-in lift. Swap to 1.6:1 roller tips and guide-plates for 0.470-in lift without machining.
- Springs – Install Z-28-style 982 valve springs for cams up to 0.470-in lift after verifying 1.800-in installed height.
- Intake – Edelbrock 3704 Performer TBI or GM 14096217 aluminum manifold bolts on without port mis-match.
- Exhaust – Standard small-block header flanges seal; no Vortec-style D-port adapters needed.
How to Inspect a Used 14102193 Core
- Magnaflux the fire deck and valve-seat throats for cracks often found between the seats.
- Pressure-test to 60 psi with warm water to confirm no porous casting leaks.
- Check deck flatness; GM spec is 0.003 in per 6 in span.
- Measure guide play with a dial-bore gauge; service limit is 0.0015 in for intakes.
A clean core passing these steps can be safely rebuilt to factory torque specs.
Buying Guide: New, Remanufactured, or Junkyard Find
| Source | Pros | Cons | Typical Price |
|---|---|---|---|
| GM dealership | Guaranteed OEM, zero cracks | Often discontinued, pricey freight | $750+ each |
| Remanufactured (online) | Resurfaced, valvejob included | Quality varies by shop | $400–550 |
| Salvage yard | Cheap cores, matching pairs | Hidden cracks, unknown mileage | $120–250 |
Reputable reman shops supply flow sheets and vacuum-tested valves; insist on these documents to verify work quality.
Authenticity Checks to Avoid Counterfeits
- Raised “14102193” casting number appears on the deck surface near cylinder two.
- A small GM “Bowtie” logo follows the number on genuine pieces.
- Center-bolt rocker covers with four 1⁄4-in coarse threads confirm 1987+ origin.
- Core plugs are 1 1⁄2 in steel, never brass on factory heads.
Aftermarket copies may omit the Bowtie or show sand-cast texture on the fire deck—signs of inferior metallurgy.
Tuning Tips for Street and Tow Builds
- Advance total timing to 34 ° BTDC at 3,200 rpm with vacuum advance plugged.
- Use 0.035-in spark-plug gap on HEI systems for cleaner burn in 65 cc chambers.
- Pair with a hydraulic-flat cam around 204/214° @ 0.050 in for tow torque.
- Maintain 14.7:1 cruise AFR; TBI ECMs adapt well when heads flow mildly better than stock.
Frequently Asked Questions
Does 14102193 support Vortec-style intakes?
No. The bolt pattern is classic 12-bolt peripheral style, not the eight-bolt Vortec pattern.
Will these heads fit pre-1987 blocks?
Yes, but you must swap to center-bolt valve covers or use adapter rails. Measure pushrod length because of the later-style lifter-valve geometry.
What gasket should I use?
Standard Fel-Pro 1010 or GM 14096405 works; compressed thickness 0.041 in maintains safe quench.
Are they good for boost?
With proper machine prep, the thick deck tolerates up to 8 psi on 93-octane pump gas. Install hardened exhaust seats to manage heat.
How much power can they support?
With mild port work and a 214/224° cam, 14102193 heads reliably feed 350 – 365 hp at 5,500 rpm while keeping strong low-end torque.
Expert Maintenance Routine
- Retorque head bolts after the first full heat-cycle to 65 ft-lb (center-bolt pattern sequence).
- Change coolant yearly; casting porosity reacts badly to neglected anti-freeze.
- Inspect valve-stem seals every 25,000 mi; replace umbrella seals to prevent oil burn.
- Check rocker-arm lash during every spark-plug change; loose rockers accelerate guide wear.
