CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: JONCE on November 13, 2007, 03:52:22 AM

Title: 302 vs. 70 LT1
Post by: JONCE 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?

Title: Re: 302 vs. 70 LT1
Post by: bilede 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.

Title: Re: 302 vs. 70 LT1
Post by: JohnZ 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.

Title: Re: 302 vs. 70 LT1
Post by: JONCE on November 15, 2007, 04:42:03 AM

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

Title: Re: 302 vs. 70 LT1
Post by: 68Zproject 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.

Title: Re: 302 vs. 70 LT1
Post by: jdv69z on November 15, 2007, 02:04:45 PM

I call the 302 flange the "Pac Man" to help remember it.

Jimmy V.

Title: Re: 302 vs. 70 LT1
Post by: 1968RSZ28 on November 15, 2007, 05:47:25 PM

Quote from: jdv69z on November 15, 2007, 02:04:45 PM

I call the 302 flange the "Pac Man" to help remember it.

I like that!    :)

Paul