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Old 09-23-2012, 04:09 PM
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Compression Ratio for 74 ford 2.3 ?

Hi
I am going to put a cam in a 74 Ford 2.3. I have heard the compression ratio is 8.5 but am not sure. Does anyone know for sure what the cr is on this engine? The engine is in a 28 A roadster pickup.

B

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Old 09-23-2012, 04:30 PM
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you can mill a LOT of that head- enough to allow for any compression that your heart desires. I'd bump it up to about 9.7:1, pick up a ranger "header" manifold, and put in a cam with about 225/225 duration. It's a great combo using all stock parts- except the cam.
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Old 09-23-2012, 08:16 PM
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Thank you for that information. If anyone knows what ratio I am starting out with for sure it would also be helpful

B
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Old 09-24-2012, 07:56 AM
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Quote:
Originally Posted by Quarter Flash View Post
Thank you for that information. If anyone knows what ratio I am starting out with for sure it would also be helpful

B
actual vs "advertised" compression can vary quite a bit for older cars. just meausre your piston volume, deck clearance, gasket thickness, and head volume and calculate your own compression.

If you don't have a mic you can measure your volume above the piston by bringing it to TDC and sealing the edges with a thin layer of petroleum jelly. Use a common medical syringe to measure the volume- available at any corner drug store.

be sure to have it level and seal the top with either a hard plastic sheet or an old CD.

These are common cheap tricks that most of us use around here.
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Old 09-30-2012, 05:08 PM
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My 1981 chilitons book lists the comperssion for a 1974 Pinto at 8.4 to 1.
BTW, when you mill the head on a Pinto engine, you need an adjustable cam sprocket to correct the cam timing after the head mill.

Last edited by cal1320; 09-30-2012 at 05:13 PM.
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