TIN MAN B, C, & E BODY 426 HEMI CONVERSION TIPS
From Tin Man Fabrication, Inc.
Fits: ’62 – ’72 B body, ’70 – 74 E body, ’66 – 73 C body
Important technical information to consider:
- This Hemi kit will work for both Small block and big block B, C and E body cars because they have the same K-member.
- Slant 6 models still require a K-member change to the V89 style.
- Factory Hemi exhaust manifolds work perfectly with this swap. Hemi headers, in the B&E-body, work as well as they would with an original Hemi car. (This mounting system won’t create header fitting problems nor solve any.) A TT1 Hemi header is strongly recommended for the best fit and performance. In the C-body, the torsion bars are closer together and the engine offset is more pronounced than in the B or E-body — this may cause interference with headers. Factory manifolds for C-body swaps are recommended.
- Aluminum heads — Due to reworked port locations, aluminum heads may cause header fitting problems, although not necessarily in all cases. This might have to be determined on a trial and error basis.
- The oil pan that comes with Mopar Performance crate engines works fine, as do most pans that are specifically designed for B and E-bodies. B and E body oil pans will work in the C body.
- Power brake boosters are smaller on original Hemi cars to allow for valve cover clearance. If your booster is larger than 10” in diameter you will need the smaller booster.
- The kit will not work with oil pumps that have external lines that are routed toward the back or firewall.
- Hemi cranks have 8 bolt flanges instead of 6. In most applications, if you are reusing your transmission, you must change your flex plate or flywheel.
- Torsion bar — Due to the extra weight, a change to the Hemi style is recommended.
- This kit works with manual and power steering, 4 speed or automatic, and cars with A/C.
- Radiator compatibility — Choosing one with its outlet and inlet on the same side as the mating connections on the engine makes for a simpler and cleaner installation. Consider using a B/RB model. For more efficient cooling we recommend a shroud and the MP Viscous Fan package.
- An MP high flow motor home thermostat is recommended. They come in 160/180 and 195 styles.
- Due to the difference in location of the coil and distributor between the A engine and the B/RB or Hemi engine models, in any A engine to B/RB or Hemi swap your wiring will have to be lengthened. Upgrading to the MP electronic ignition system, if you haven’t already done so.
- In most cases, drive shaft fabrication will be necessary if the rear axle assembly style and/or the transmission model are changed, e.g., going from the 904 to 727 transmission will require shortening the drive shaft as well as a different yoke or using a conversion U-joint.