Planning to swap out my 260 for a 351w and want to know the visual differences ide beable to tell at the junkyard? Any help appreciated..

 

the 351 is wider than the 302...just measureacross the intake...i think its 1-1/2 inches wider.

 

its wider is all i can think of

 

came accross this online..

302/351W Engine dimensions:

Using the short serpentine water pump both 302/351W are 27-1/2" in length.

302 height = 20-3/4"
351W height = 23-3/4"

302 width = 18-3/4"
351W width = 21"
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4.6L modular engine dimensions:

Both the 4.6L SOHC & DOHC are 28" in length.

4.6L SOHC height = 26"
4.6L DOHC height = 29-7/8"

4.6L SOHC width = 25-5/8"
4.6L DOHC width = 30"

Engine weights (approximate shipping weight)

5.0L 302-345HP GT40 Aluminum Head Crate Engine Shipping Weight = 425lbs
5.0L 302-360/390 HP Z head Crate Engine Shipping Weight = 405lbs
5.0L 302-347CID - 450HP Z head Crate Engine Shipping Weight = 425lbs

5.8L 351 - 385 HP GT40 aluminum head Crate Engine Shipping Weight=545lbs
5.8L 351-392CID 430HP GT40 Crate Engine Shipping Weight=545lbs

7.5L/460CID Super Cobra 550HP Crate Engine Shipping Weight= 670lbs

 

Look for a rise in the block behind the distributor of about 1 inch.