I have both option to use on a new FJ45 restoration. But cant find a simple answer on the exact difference in terms of performance. As far as I have been able to read, there is no significant difference! Is this correct?
What is the exact difference between a 3F and a 2F engine?
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1911
chupacabra
The 3F is a de-stroked 2F, so you gain some rpm on the top end, but lose some torque on the bottom end. It was a stop-gap solution for larger Cruisers that needed more highway speed, until the 1-FZ series was ready to roll out. How significant a difference 7mm of stroke makes, is a matter of personal opinion I suppose. It's not night-and-day.
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- Thread starter
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Many thanks for your help, very clear and makes sense. I also run and FJZ-80 with stoke 3F carbureted engine and what you are describing in terms of highway speed is exactly what I experience. Tnx again.
JohnnyC
Long ago TLCA# 2231
The exact difference is 1 
Two years later - that answer still plays. Nicely done.The exact difference is 1
Living in the Past
SILVER Star
Sure you didn't mean five years. Post was January 24th 2017 not 2020.
I have two fj55 1973 1968 and the both 2f engine I upgrade the fj55 1973 with pully crank of 3f engine gear 5 speed and clatch and steering wheel..air condition the only different is head cylinder more than valve in 2f and 3f more speed in highway
What is exactly the Difference between the Heads? Do i can use a 2F Head dor a 3F engine? Cheers thx
