4.3L TBI Injector Flow and Factory Cam Specs

4.3L TBI Injector Flow and Factory Cam Specs

Here’s a reference chart of TBI injectors.

Flow is lb/hr @ 13psi

GM Part # Engine Flow TBI bore
5235430 2.8L 33 35mm
5235203 4.3L 45 43mm
5235279 5.0L 40 43mm
5235206 5.7L PU 55 43mm
17084327 5.7L Police 65 43mm
1708430 Late BB PU 80 51mm
5235231 Early BB PU 90 51mm

Factory 4.3L Cam Specs

* ’96-’00, VIN W, w/ balance shaft
– Lift (I/E) – .415/.429
– Dur @ .050 (I/E) – .191/.195

* ’93-’96, VIN Z, w/ balance shaft
– Lift (I/E) – .376/.402
– Dur @ .050 (I/E) – .183/.193

* ’92-’95, Vin W, w/ balance shaft
– Lift (I/E) – .432/.440
– Dur @ .050 (I/E) – .208/.208

* ’91-’93, ZR9/Z79, Syclone/Typhoon
– Lift (I/E) – .351/.386
– Dur @ .050 (I/E) – .179/.195 (Ductile)

* ’90-’91, VIN Z, Astro/Safari
– Lift (I/E) – .403/.450
– Dur @ .050 (I/E) – .202/.213 (Steel)

* ’87-’94, Vin Z, w/o balance shaft
– Lift (I/E) – .351/.386
– Dur @ .050 (I/E) – .179/.195 (Ductile)

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