engine identification

broncomudder707

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Jan 27, 2011
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Hey all, Im new to the zone but have had a few fs broncos. I was wondering if anyone can help me identify the engine in my bronco. Im not sure if it is a 302 or 351. The bronco is an '86 and fuel injected. The labels under the hood say 302, but when I got it smogged the receipt said it was a 351. It looks pretty close to the 351 in my '91 f250 but I cant find any markings on the block(not really sure what to look for) to tell me which motor it is! Anyways, any help you can give to help would be greatly appreciated!!!

 

Seabronc

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Unless the engine is newer than 87 it is probably a 302. The 351 was carbed until 88 when they switched it to EFI. The engine part number is down by the starter and pretty difficult to see.

Good luck,

:)>-

 
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miesk5

96 Bronco 5.0
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yo,

Some info I've kept over the years;

from; fordification.com

Windsor engine characteristics

Thermostat housing bolted to the front of the intake manifold

All 289/302/351's have intake bolts 90 degrees to the ground

289/302/351's have evenly spaced exhausts aimed 90 degrees from length of head

5/8" (18mm) spark plugs

The 351W and 302 are very different:

The 351W has a taller deck height than the 302. (a 302 will have the intake almost flush with the base of the distributor... where it goes into the block..... a 351w will have about 1/2 inch lip there where the intake meets the block.)

Since the deck height is taller the intake manifold is wider on the 351w than on the 302.

The 351W uses a larger main journal than the 302. there are 2 physical ways of telling a 302 vs. a 351w. Also, in between the frost plugs on a 351W there will be what appears to be a triangle or diamond (the way I was told) indented cast into the block...a 302 doesn't have those.

a 351W is wider between the heads compared to a 302 (the intake manifold is wider by about 1-1/2") and 351 pistons have a different pin height. You can use 302 pistons in a 351 if you stroke it to a 393

quick ID tip: The lower thermostat housing bolt on the 302 will be below the top of the water pump and you won't be able to put a socket on it. On the 351W you can remove the bolt with a socket.

...................



The early 351W has four extra intake manifold bolts (13, 14, 15 and 16). If you see them, it's definitely a 351W.

============

The positive ID is to measure the lower intake; 302 is aprox ~ 8 inches wide. 351 is aporx ~ 11 inches wide. The 5.0L uses squared ports and the 5.8L uses oval ports. If you get an intake from a junk yard it will have the matching fuel rail..."

Source: by Ryan M (Fireguy50)

 

zintrex

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Aug 11, 2009
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if you have a fuel injected engine the easiest way to see if you have a 302 or 351 is to look at the top of ur intake plenum.

if it says 5l you have a 302 if it says 5,8L you have a 351.

il even upload a shot from my engine so you know where to look:



 

zintrex

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Aug 11, 2009
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yo Z!

Nice pic! I'd like to insert it as a link in my site, OK?

.............
no probs at all.

if ya want i can upload the original instead of the one with the horrible mspaint lines in it..

and yeah, i cinda dint take into account that one...

my way only work for stock engines...

 
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nelbur

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Oct 30, 2010
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The only EFI engine sold in '86 was the 302. If it is original, it's a 302. This was the first year EFI was used in the Bronco, and I had to go buy one. I still have it. It is a very simple EFI with no oxygen sensor, no MAF, and so far as I can determine, no feedback of any kind. I still have the original injectors, which are hard to keep clean. If you use cheap gas, like I do, it will start idling poorly as they get dirty. A tank or two of name brand regular (I use Exxon) will usually clean things up and get your smooth idle back. I'm told later injectors have a different design that stays clean. Love this truck.

 

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