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65mm to 70mm Throttle Body

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Old 03-05-2009, 03:41 PM
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sschanz
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Default 65mm to 70mm Throttle Body
I was watching Hot Rod TV and they had a '93 Mustang that they proposed like 8 mods that totaled less than $1,500 that will get an additional 50+hp.

I have a bone stock '93 5.0 in my '66 Coupe. I thought about getting a new 70mm throttle body. Does anyone know if this will work or do I need to get a new intake? Will upgrading to a 70mm give me a performance increase?
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Old 03-05-2009, 03:56 PM
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NotchAbove
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You do not need a different intake for a 65 or 70mm throttle body swap. Most guys with minor modifications will go with a 65. There is not a huge difference between 65 and 70 anyway.

Regarding the upper intake: I believe the stock upper intake opening is just about 65mm, so if you go with a 70mm, you will have some restriction unless you port match the intake to the TB.
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Old 03-05-2009, 05:33 PM
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sschanz
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Thanks. Is the throttle body something that should be changed eventually due to mileage and wear? If so, then I can just put a new 65mm on there.
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Old 03-05-2009, 06:18 PM
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AdderMk2
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even a 65mm is an upgrade... 93 came stock with a 58mm TB
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Old 03-05-2009, 06:57 PM
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93 LX FiveO
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65mm is more than enough for a stock 5.0
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Old 03-05-2009, 07:01 PM
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Joel5.0
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Originally Posted by 93 LX FiveO
65mm is more than enough for a stock 5.0
I wonder why 3.9L V8 Ford engines use a tapered 82mm-69mm TB OEM then? ....
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Old 03-05-2009, 07:29 PM
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Timspony
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Can't compare a modular motor to a push rod motor! ...Go with a 65mm TB on a stock 5L
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Old 03-05-2009, 07:39 PM
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Portmaster
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Twin 101's lol

either one will work fine.
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Old 03-05-2009, 07:50 PM
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im going 80mm once my new intake is finished
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Old 03-05-2009, 08:47 PM
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Joel5.0
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Originally Posted by timspony
Can't compare a modular motor to a push rod motor! ...Go with a 65mm TB on a stock 5L
Why?..... aren't both 4-cycle otto engines? ..... what makes one so special over the other?
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