chev

[FCOV6]

I like the 283 and the 305, good 283's are getting hard to find.

[FB_MAD]

I'm using a 1968 HK 307 in my EK sedan, I'm sure it will pull more than a grey motor would

[Ed]

Just stroke it to get the capacity you're after

easy 

[weddo]

Under the current Australian "National Code of Practice for the Construction and Modification of Light Vehicles" a modified FC special sedan can only have a maximum 268 cubic inch motor based upon the original 1094 kg vehicle.  1094kg x 4 = 4376 cc or 268 ci
An FC ute is only 1085 kg so you are looking at a slightly smaller capacity

Standard Sedan - 2389lb (1084kg)
Special Sedan - 2412lb (1094kg)
Standard Station Wagon - 2517lb (1142kg)
Special Station Wagon - 2533lb (1149kg)
Panel Van - 2415lb (1095kg)
Utility - 2393lb (1085kg)

(from the National Code of Practice)
All vehicles originally weighing between 800kg and 1100 kg -

Original weight (kg) x 4 = maximum capacity naturally aspirated
Original weight (kg) x 2.5 = maximum capacity turbo charged or super charged

regards
Weddo

[Glenn 'Stinky' Stankevicius]

Wow, what extra 10kg of stuff between the Standard and Special Sedans would only weigh 7kgs in Station Sedans?

[earlyholdenfan]

The other reason to talk to your engineer, is most of the various registration authorities only use an "Acceptable" weight across the whole model range, for instance Queensland Transport will use the weight from the official Section LA of their standards for modified engines, and they think the following weights are right FOR ALL VARIANTS OF THE PARTICULAR MODEL:

FE:    1050kg
FC:    1070kg
FB:    1099kg
EK:    1120kg

and the formula they use for a mono constructed vehicle is
Normally Aspirated:  In Cubic Inches = Original weight (kg) X 0.294
Super Charged or Turbo Charged:  In Cubic Inches = Original Weight  (kg) X 0.244

IF your engineer thinks you have a seperate chassis construction (front subframe etc) he can also drag this set of rules into play:
Normally Aspirated:  In Cubic Inches = Original weight (kg) X 0.333
Super Charged or Turbo Charged:  In Cubic Inches = Original Weight  (kg) X 0.286


Given those regs, you could put a 314.58 ci naturally aspirated engine, or a 261.08 supercharged engine in an FC of any description. BUT every engineer you will talk to will have different ideas of what HE will certify, as it all rests squarely on his shoulders if it goes pearshaped.

Your engineer may have a different ideas and history with modified vehicles and work with you to help obtain a larger engine capacity, so obviously talk to a few engineers and find one you are comfortable with for the job, and check their reputation thoroughly.

Just my 2c worth
Matt

[GM]

Those are the same formulas used in N.S.W.

                          Cheers Glenn