302 vs. 70 LT1

[JONCE]

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]

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.

[JohnZ]

The 302 crank flywheel flange has a unique shape, with a pie slice-shaped cutout on the edge, shown below.

[JONCE]

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

[68Zproject]

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.

[jdv69z]

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

Jimmy V.

[1968RSZ28]

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

I like that!   

Paul