The STEP file uses millimeters and several factory engine dimensions. Its outside surfaces are still a reconstruction study. This register says which features the photographs now establish, which sizes remain estimates, and exactly what to measure next to approach a faithful 1:1 model.
Present accuracy boundary
The factory manual gives bore, stroke, selected journals, rod centers and valve-head sizes. A replacement gasket supplies a tentative rocker-cover footprint. The new photographs identify more fitted assemblies and visible shapes, but do not establish hidden surfaces, hole positions, mounting planes or tolerances. The current STEP must not be used as a replacement-part or machining drawing.
The 1:1 target
The intended end state is a virtual version of this car that lets you rehearse a replacement before doing it for real. A part reaches that standard when its fitted identity, mounting points, access clearance and direct dimensions are verified, and the virtual removal sequence follows a sourced repair procedure with tools, fasteners and reassembly checks. The current engine assembly is a measured-core study; its provisional outer surfaces cannot yet support a reliable removal rehearsal.
Dimensions with documentary anchors
These values control only the named geometry. They do not validate adjacent castings or placements.
73.7 mmNominal cylinder bore · factory manual
87.5 mmCrankshaft stroke · factory manual
145.90–146.10 mmConnecting rod centers · factory manual
Each part is selectable in the engine CAD. Use its “What to capture next” list to create a project. The CAD inspector also shows the current model envelope and saves your direct X/Y/Z measurements in an exportable log for comparison. A ruler in a photograph helps establish scale only when it is in the same plane as the surface being estimated.
The internal bore/stroke/journal data are sourced. Outer block and head faces, bolt holes, ports, bore pitch and engine mounts remain undimensioned in this model.
Record engine prefix and all casting numbers first.
Measure cylinder-center spacing and head/block length, width, deck height and mounting-face offsets from the actual engine or dimensioned components.
Make front, side and top square-on image sets with scale targets at the same depth.
The replacement gasket suggests 360 × 110 mm. IMG_6893 reveals the fitted cap's two-grip shape, two hold-downs and stamped ribs. Cover height, exact fastener centers, cap seal and opening still need measurement.
Measure cover length/width/height and hold-down centers directly.
Measure the cap flange and grip span; photograph the underside when safely removable.
Photograph the cover square to its top and each side with a ruler.
IMG_6885–6887 identify a separate metal case, elbow and two-clamp rubber joint. The current CAD groups represent their visible layout. The case element, sealing face, mount locations and all duct diameters remain unknown.
Measure case length, width and height, seam and clip positions.
Measure both metal tube outside diameters, coupling length and bend centerline offset.
Photograph the case markings and each joint before opening or moving it.
IMG_6892 confirms SMITHS on the rear casing and shows a round outlet and two hose connections. The CAD's 330 mm width came from a perspective-sensitive comparison and needs replacement with a direct measurement.
Measure case width, height and depth in place.
Measure outlet and hose outside diameters, center positions and mounting-hole spacing.
Record any molded model number and photograph both visible case faces.
IMG_6897–6898 identify a blue ACDelco spin-on filter and labeled electric fuel pump. The image does not establish the filter thread, seal size, adapter, pump rating or fuel-line routing.
Record the complete numbers and mounting adapters on both units.
Measure filter canister height and diameter in place.
Trace pump inlet, outlet and wiring; record fittings and bracket centers without disconnecting lines.
IMG_6895 shows irregular missing material on multiple fan tips. The CAD's 13-blade catalog configuration, diameter and mounting spacing do not establish what is fitted. The geometry does not attempt to reproduce the unknown damage pattern.
With the engine unable to start, count and photograph every blade and record the molded number.
Measure outside diameter across intact tips, mounting-hole centers and the nearest radiator clearance.
Record individual damaged blade positions and replace a damaged fan before any engine run.
IMG_6894 shows the alternator case and mounts; IMG_6899 shows a coil marked external resistor. The CAD distributor and alternator have recognition geometry, not measured mounting planes or electrical specifications.
Photograph maker plates and complete numbers.
Measure case and pulley diameters and bracket center-to-center distances.
Record coil terminals and lead route before changing ignition parts.
The full-car viewer is a schematic assembly. The factory wheelbase and total length anchor its proportions, but body surfaces, panel gaps, suspension pickups and wheel/tire sizes on this car are not scan verified.
Record chassis plate, wheel/tire markings and ride height.
Take straight front, rear, side and top views with a visible scale and fixed lens setting.
For surface fidelity, use calibrated photogrammetry or a direct scan with surveyed control dimensions, then compare key points to the factory measurements.
Photograph the chassis plate, engine number, carburetor tag, filter number, electric-pump number and any air-cleaner or heater number. This establishes which exact assemblies are fitted.
Measure the rocker cover and cap, metal air-cleaner case and coupling, heater case and outlet, oil-filter canister, and fan outer diameter. Use a ruler in the same plane in each photograph.
Take square-on front, side and top photographs of each assembly and a whole-bay view before anything moves. Record the camera/view direction and keep dimensions with the corresponding image in a project evidence log.
Replace one provisional CAD part at a time, check its dimensions against at least two direct measurements, and compare its rendered silhouette with the photo from the matching viewpoint.