5.0L vs. 5.8L

[Boss 351]

Well not really... How can you really tell them apart when there is no intake or valve covers and the serial number is not readible? I hear the 302 has 12 bolts for intake to heads while the 351 has 16.

I think the distributor is different? any other clues.

 

[matty50racer]

The 351 is a bit larger than a 302 because the deck is 1.3" taller. Also the 351 has 1/2" head bolts and the 302 has 7/16 head bolts. The distibutors and oil pans are different but it is hard to tell the difference by just looking at them.

 

[POWER302]

the 351w does have more intake bolts. And the intake is wider than the 302s.you can measure from head to head and see which one is bigger..

 

[hllon4whls]

Well not really... How can you really tell them apart when there is no intake or valve covers and the serial number is not readible? I hear the 302 has 12 bolts for intake to heads while the 351 has 16.

I think the distributor is different? any other clues.

This is the easiest and most accurate way that I know of to tell a 351W from a 302 if it is fully assembled.

If the lower water neck bolt is not behind the waterpump, but slightly over it, then it is a 351. If The only way to get the lower waterneck bolt off is to reach behind the WP, then you have a 302.

The 351 has 12 intake bolts, just like the 302.

 

[Kid wita 5oh]

the absolute easiets way to tell. assembled or not is to look right above the timing cover area, if it is a 302 the deck will be cut at basically the edge of the water passage and the 351 will have about 1inch before the deck...

 

[Boss 351]

Ok thanks guys. The older 351W had 16 intake bolts and the newer has 12. I just installed my cousin's 351 intake and fit perfectly