2.4 conrods in a 2.8 block

[KID-K]

Hi, has anyone an information that might help:

Looking at building a 2.8 motor with the following:

2.8 block, 2.8 crank, 2.4 conrods, standard pistons and a n42 head.

The compression ratio with 2.8 conrods is 8.29:1, where if you use the 2.4 conrods the compression ratio is 10.71:1

Has anyone come across this before, are there any issues with using the longer rods...thanks..any feed back will be fantastic

[blue 72]

Won't work without custom pistons. The L24 rods are almost 3mm longer than the L28 ones. Attaching L24 rods to L28 pistons and crank would cause them to smash into the cylinder head.

Hypothetical installed piston height = 210.6mm

Deck height = 207.85mm

Scenario = not gonna work