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Old 09-25-2015, 03:06 PM   #1
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Motor size.

How can I check to see what motor I have. I've always thought it was a 302 but when I did my spark plug wired the sequence was to a 351. I want to check to see what I have. Thanks



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Old 09-25-2015, 05:22 PM   #2
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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.
  • Also head bolts will be 1/2" on the 351 and 7/16" on a 302.
What is your sequence that you are using? 1-3-7-2-6-5-4-8
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Old 09-26-2015, 08:33 AM   #3
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The 351w uses the same firing order as the 302 HO(1 3 7 2 6 5 4 8)
The 302 Non-HO motor uses the
(1 5 4 2 6 3 7 8) firing order.

The easiest way to tell them apart is probably by measuring deck height.If you look at the diagram shown below,the white line with an arrow at both ends is the area you need to measure to get deck height.The 351w block is 1.274" taller than the 302,so you should be able to distinguish between the two due to the 351w extra height.You normally measure deck height with the crank removed and a main cap installed, but you can't do that since your engine is assembled and parked in the engine bay.So you kinda have to eyeball it somewhat while using a tape measure.If there was only a 1/4" height difference between the two blocks,it would be very hard to distinguish between the two,but a 1.274" height difference should visually be enough to id which block you've got.I hope this wasn't confusing because I can sometimes confuse myself with how I word things or when going overboard on my description.
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Old 09-26-2015, 03:33 PM   #4
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It has the 5.0 ho intake on it right now. I wasn't sure about what size ?


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Old 10-05-2015, 01:35 PM   #5
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You have a 302.
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Old 10-05-2015, 04:13 PM   #6
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Could be a 460????














Naw just teasin'
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Old 10-09-2015, 10:48 PM   #7
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Quote:
Originally Posted by smurf stang View Post
Could be a 460????

Now that would be a surprise worth jumping up & down for,right smurf??460ci!!! I'm curious as to how far a 460 can be stroked up to,cubic inch wise?? Even though I could care less about a Chevy,I am curious about why Chevy's 454ci engine doesn't put out alot of
power??Or am I wrong??

BTW-I know how to click on Quote & reply underneath that posters quote,but what happens when you click on Quote+ ??Does that allow me to post & reply to multiple members?? If I click quote,that members quote pops up in a new posting window,but what do I click on next after I've replied to the first quote??How does the posting window know who I wanna quote & reply to next??
Sorry 4 the thread jack,209stang.













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