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Old 01-26-2011, 09:28 AM
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How do you identify a 351 4V Cleveland engine and ...?

How do you identify a 351 4V Cleveland engine and a 9 (3.50 Ratio, traction-lok) rear end?
Are there any numbers to look for? Are there any distinct external features to look for?

A couple of pics below.



Thanks in advance.
Raj

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Old 01-26-2011, 10:46 AM
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Look at the head right next to the dipstick tube. The 4V heads will have a 4 cast into them on the upper corner of the head near the valve cover rail. 2V heads will have a 2, and 351/400M heads wont have anything but they are 2V heads with very minor differences. The ports are MUCH bigger on the 4V but they are still a good street head. The most you need with a 4V Cleveland is a cam, headers and sometimes an intake manifold to make very good power.

4V on the left, 2V on the right.



Clevelands have distinctive valve covers too, those are Cleveland valve covers. on your engine. The timing chain on a Cleveland is covered by a steel plate and a portion of the block, a 302/351W has an aluminum cover and the block face is flat.



A 9" is identified easily by if you can get a socket on the bottom bolt holding the pumpkin in the housing. Sometimes the locking diff is harder to spot. On a GM rear if you lift the rear end, put it in neutral, and spin one tire, a posi/limited slip will turn the other wheel the same direction,and open rear will turn opposite. On the Fords, some locking diffs need torque applied to work, so the wheels will turn opposite even with a locking rear. A Detroit Locker on the other hand is like a spool with some cogs in it that allow it to unlock around corners, it acts like the GM posi.

So what that means is you usually have to pull the pumpkin and take a look to be absolutely sure.

Last edited by Thumpin455; 01-26-2011 at 10:52 AM.
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Old 01-26-2011, 01:04 PM
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Thumpin455,
Than you very much for such a knowledgeable response!
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