Author Topic: 302 vs. 70 LT1  (Read 6526 times)

JONCE

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302 vs. 70 LT1
« on: November 13, 2007, 03:52:22 AM »

I recently purchased 69z28 (VIN N575600) and was told it had a replacement 302 (CE426166 3970010 '74 counter exchange)...I have reason to believe it is 350LT1..heads have camel hump markings and casting #3991492.  Query: Is it possible that these heads are interchangeable with either 302 and 350LT1?  Apparently LT1 engine is one of Chevy's finest.  Does it make Z28 a lot  less valuable given most of car is either original and/or orig. to the year?

bilede

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Re: 302 vs. 70 LT1
« Reply #1 on: November 13, 2007, 06:51:18 AM »
All the parts are interchangeable except what makes it a 302.  the crankshaft and the pistons. most other parts are the same or similiar.  should be able to see the crankshaft where the flywheel bolts on.  302 crank has a different shape than the others. there are photo's of it online I am sure.
69 Z/28 RS - 9N631044/9N631043 cortez silver w/black stripes and top. deluxe blue interior. still looking for more history on car.

JohnZ

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Re: 302 vs. 70 LT1
« Reply #2 on: November 13, 2007, 03:50:23 PM »
The 302 crank flywheel flange has a unique shape, with a pie slice-shaped cutout on the edge, shown below.
'69 Z/28
Fathom Green
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JONCE

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Re: 302 vs. 70 LT1
« Reply #3 on: November 15, 2007, 04:42:03 AM »

Thanks for the input...much appreciated!  I will drop the oil pan and check the crankl

68Zproject

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Re: 302 vs. 70 LT1
« Reply #4 on: November 15, 2007, 06:24:58 AM »
Don't need to.  Check like bilede said at the back of the engine where the flywheel bolts on.  If it looks like JohnZ's picture, it's a 302 crank.
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jdv69z

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Re: 302 vs. 70 LT1
« Reply #5 on: November 15, 2007, 02:04:45 PM »
I call the 302 flange the "Pac Man" to help remember it.

Jimmy V.
Jimmy V.

1968RSZ28

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Re: 302 vs. 70 LT1
« Reply #6 on: November 15, 2007, 05:47:25 PM »
I call the 302 flange the "Pac Man" to help remember it.

I like that!    :)

Paul

 

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