A companion to A 350 is only the beginning of the story.
You have matched the year and engine, found a factory table, and finally have a number. Then another factory page gives you a different answer.
That disagreement does not, by itself, tell you that somebody modified your truck. Sometimes the first thing to investigate is the paperwork.
Chevrolet’s 1974 pickup specifications offer a useful reminder. Two pages bearing the same date put the 292’s peak torque at different engine speeds. The 1987 material presents another puzzle: an undated feature page and a February specification table give different torque figures for the 305 EFI. Neither comparison establishes why the numbers differ or when an engine might have changed.
Before choosing a figure, check the model year, market, model or weight restriction, and the notes attached to that particular entry. Then check the page’s own date. A cover year is not a substitute for a dated leaf, and an undated page cannot tell us which version came first.
If the originals still disagree, keep both readings with their sources. Don’t average them or quietly choose the one that looks familiar.
Most importantly, keep two questions separate: “What does this factory document say?” and “What was installed in this particular truck?” A printed-table conflict does not, on its own, establish a truck’s originality. Vehicle-specific records and identification evidence belong in that second investigation.
Source notes
- 1974: Both leaves are dated February 15, 1974. The 292-1/SE Six is printed at 215 lb-ft at 2,000 rpm on Pickup page 21 / PDF 24, versus 215 lb-ft at 1,800 rpm on Pickup page 22 / PDF 25. No preferred reading or explanation is established here.
- 1987: The 5.0-liter 305 EFI rating is 260 lb-ft at 2,400 rpm on undated Engine Value Features page 11A / PDF 14, versus 255 lb-ft at 2,400 rpm on February 1987 page 19 / PDF 38. Both rating entries carry the GVWR-up-to-8,500-lb qualifier. The undated page does not establish a sequence of revisions.