Can you build a real Chevy 302?

186 heads ,,618 block early 1st design. later 010 universal block ;but was only the 4bolt not 010 two bolt. Crank 1178 ,distributor 1480 ,carb 4053. Huge crank balancer. Factory Windage tray. Tray bolts to main studs and oil pump. Inside of oil pan will have 1/8" x1 1/2" about 15" long steel scrap a little ways down from rail on both side welded at an angle to match up to windage tray. That's all the stock numbers and stuff For every thousand blocks stamped dz about one is true blue. Check it out, you mighty have something.


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He's offered to take me to it a few times but I didn't want to act TOO interested. Doubt he's gonna let me start pulling it apart to check casting numbers on everything. I think as long as I'm armed with the block casting #'s and suffix code I should be good?

 

The -618 block should be a large journal block being a 1969 casting. There was also a -386 and -388 302 block in 1969. The '1968 block was -678 and should also be LJ. Both were designated DZ engines. The 1967 MO designation was a small journal -657 block, but very few of these would have been produced and most would have been used up in SCCA competition.

...or I could be mistaken!

 

When u say -618, -678, etc your talking the last 3 digits of block casting number I assume?

 

I cannot confirm this for every Chevy block ever manufactured as I have not owned one of every one ever cast. But generally speaking the 2 bolt block has heavier webs then the 4 bolt block. An old racer trick is to take a 2 bolt block and add 4 bolt main caps for this reason.

I may have actually already said this so if I have ignore what I am about to say. One could certainly source every part needed to build a 302 Chevy, even if one was trying to build an exact copy of a factory Z-28 mill. I would think that unless one actually found actual factory parts like in the proper coded block, crank heads and etc that it while it could still be the same displacement one could not actually reproduce and actual z-28 302. That was a factory manufactured motor and no one is actually the GM factory.

 

We want pictures!.....

 

I just read most of this thread. It is amazing to me how some people spout "facts" and don't have a fucking clue.

 

Well, what the hell do you know?????....

 

Ha! Yes, I'll take some pics if it's the real deal. If not u get Barbera bush in a bathing suit!

 

Yessir!

 

Bore a 283 an 1/8, or put a 283 crank into an early 327, drag racers did it for years before Chevy made an official "302"...

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Yes, and Z-bar cross shaft threaded boss in a different location.

 

Lucky Strike 302 chevy motors are one of the most fun engines I've run in my cars. I built one from a 283 and put it in my 49 Willys wagon but kept it when I sold the wagon....put it in my 53 F-100. Shoulda put it in a much lighter body.
I have almost enough parts to build another one with better parts. Got a set of 11:1 TRW forgings [heavy], a set of NOS Oliver steel rods, an old '65, 283 block and crank with a pair of 186 heads in 1.94/1.50 valve size. No cam or intake yet. I'd love to buy a set of more modern pistons and AFR aluminum heads but ......I dunno.
If the Pontiac motor in my coupe blows up, I'll build the 301....or 302 or 301.59 or what ever!

 

Old thread but good topic. Lot of ways to get 4 in bore and 3" stroke. Need good heads and even better valvetrain. Modern rods up to 6.125, flyweight pistons, its all off the shelf stuff now.

Id personally go 377 if i were building a "wind it up" engine.

 

That would be gross she died last April......or worse maybe you have a private stash of old snaps...eeeew!

 

Most likely the kid didn't know how to drive the Z-28!

 

Not sure but I know they swapped cars and even had different guys drive both cars.
The 340 Dart was just fast.

 

And for some reason that Z-28 was not as fast as it was capable of being, just do a little reseach on what they both tested out at back then. The Z-28 should have beaten the Dart by a large margin, with everything being equal! Just saying

 

Probably true. I was surprised myself at how fast the Dart was.
I just remember how impressed I was by this plain white Dart.
Lots of fun for a high school kid like me at the time.
Being out there with the guys and all their 55-57 Chevys and other 60s cars was a great time in my life.
The high school parking lot is a good memory too along with cruising around town.

 

DRAG TESTS 1960 - 1972 has the '69 Z/28 @ 14.74 in the 1/4 with a 4 speed, while a 3 speed manual '70 340 Dart ran a 14.70. My money would be on the Dart, especially if it had 4 gears.

 

Old memory ain't what it use to be. After your post, had get the chart. These are f body engine block casting numbers. 014 block was 350 only. There was a 3959512 warranty block also used in some production 1969 dz motors. The mo small journal was used in 1967 and the mp was smog 67 302. I was told that a few early mo small journal with replaceable oil filter cart rage blocks were use in 68 z/28 but never seen any proof. As far as I know in 1968 all 302 blocks r large journal mo..


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Dropped off at the engine builders. Going to take the DZ clone approach.

 

Just go with a 302 instead of dz....

 

What would the outcome be if the Z/28 had 4:56 gears? Give them both a gear and good tires and my money is on the 302.

 

Pretty sure the Dart came standard with 3.23's, while the standard rear gear for a z/28 was 3.73. Put 4.56's in both and a pair of slicks and I'll still bet on the 340, especially if it has 4 gears.

 

I couldn't tell you what their gears were or any of that but I do remember that white 4 speed 340 Dart beat the Camaro every time.
That started my love affair with the 340 that lasted for quite a few years. The 340 with the big valves and compression of 1970 was a very strong engine.
Add the purple stripe Mopar performance cam and a better manifold and headers and it was hard to beat.

 

If any one is interested I have a 327 short block bored .030 over with a 283 crank and power pack heads for sale


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You anywhere in Motown????

 

I think the Boss 302 Mustang was ruling the series back then. lol