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What is “Compression Ratio” and is there a way to change it on a 429 ford engine?

December 16th, 2010 · No Comments

Problem: I have been told that ford changed the compression ratio on the later ford 429 engines, is there a way to change it back to the earlier compression ratio?

Answer: the 429 is a killer block….a domed piston will increase compression ratio and a dished piston will decrease the ratio longer or shorter piston rods will do the same job but the higher the compression ratio the higher the octane rating fuel is required. Normaly in a 429 9.25 to 1 is concidered perfect depending on age ,wear ,and care.How old is the block, how is it driven, what work has been done to it? My mustang is a 69 gt 500 totaly stock but the motor is cherry. It all depends on the maintenence.

second: “Compression Ratio” refers to the ratio between the cylinder volume when the piston is at the bottom of its stroke and the top of its stroke – basically, how much the piston compresses the air/fuel mixture in the cylinder.

Generally, the way to increase compression ratio is to install “taller” pistons, probably not something you’re up to doing yet, if you’re asking this question. But everyone starts somewhere..wishing you good luck if you decide to do it yourself! :)

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