what do you want to know??

are you wanting to stroke it?

keep it stock?

want info about the block?

dz 302

1: very rare (let me buy it )

2:main journals 2.45"

3:stroke 3.00"

like i said what do you want to know?

at least your building a chevy powerplant, so far you got started on the right foot :thumbup:

j

 

You can use any 350 block. You should be able to find a 3 inch stroke from most crank suppliers. If you want to truly clone the 302 you need to use bushed pink rods with floating pins on the 11:1 pistons.

Better yet, build a 350 and take advantage of the longer stroke to produce more torque. with the engine in the vehicle you cannot tell the difference once the block has been decked.

 

oh woops, i stuck my whole foot in my mouth that time

i'm sorry i misunderstood the question

J

 

you need a small journal 327 block and a 283 crank...4.00 bore + 3.00 crank=302ci chevy...the 302 chevys where small journals..

 

OUCH...! A mustang guy shamed you all...

 

also..i do belive that there no such thing as a small journal 350 block...they are just a 327 small journal..now a large journal 327 and a 350 are the same block...hope that helps

 

you need a small journal 327 block and a 283 crank...4.00 bore + 3.00 crank=302ci chevy...the 302 chevys where small journals..

Not all 302 Chevies were small journal, only 67. Starting in 68 they went to a medium journal 2.45" mains crank.

Vince

 

My '69 DZ has 186 2.02 heads and a Chevy 472 Winters aluminum intake. I think that carb was a Holley 2818.

 

Not all 302 Chevies were small journal, only 67. Starting in 68 they went to a medium journal 2.45" mains crank.

Vince

The 68's were also 2 bolt blocks. All 69's were 4 bolt.

The original MO block 302's were 327 blocks with 283 cranks.

In 68 all blocks were big journal as it is called. Even the 327. The 307 was a 283 bore and a 327 stroke. Can you say smog motor?

Hey vince, got pink rods?

 

Vince is right on the journal size.

In 67 you could use a 327 or 350 block both small journal #3892657. In 68 the block changed to #3914768 and became large journal. They are 2 bolt

69 remained large journal and could have been one of three different block castings. They are 4 bolt.

In a nutshell, the 302,327 and 350 shared the same block and just had different strokes (3.00, 3.25 and 3.48)

The things that really made a 302 were

Steel crank 3" stroke.
302 Cam shaft
11:1 compression.
Aluminum intake and holley carb
2.02 heads

Thats the "bulk" of it.

Proud owner of a 1967 302 Z28 with factory headers and factory cowl induction.

Rich

 

Vince is right on the journal size.

In 67 you could use a 327 or 350 block both small journal #3892657. In 68 the block changed to #3914768 and became large journal. They are 2 bolt

69 remained large journal and could have been one of three different block castings. They are 4 bolt.

In a nutshell, the 302,327 and 350 shared the same block and just had different strokes (3.00, 3.25 and 3.48)

The things that really made a 302 were

Steel crank 3" stroke.
302 Cam shaft
11:1 compression.
Aluminum intake and holley carb
2.02 heads

Thats the "bulk" of it.

Proud owner of a 1967 302 Z28 with factory headers and factory cowl induction.

Rich

the 350 was introduced in 68 not 67.

You are a lucky dog with that one of 602 Z's.. I helped a friend restore one in 79 that had been dragraced a bunch. the oh 2 was long gone. but we found a 68 MO block out of a wrecked Z.

In my time I have had a 70-1/2, a 69 and an 85. I had belonged to an informal Z/28 club in San Diego in the late 70's. We had a CHP officer with a 68 that when he saw a Z on the hwy, he would get on the PA and talk to them. Then let them know where we would be hanging at. at any given moment we could get 8 Z's in a parking lot with in 2 hours. It was a blast.

 

the 350 was introduced in 68 not 67.

Afraid not. What do you think the 67 small block SS were powered by?

1967 Camaro Super Sports were 350 and 396.

Rich

PS: Thanks, I think I am a lucky dog too. Have wanted one since I was 16. On top of that is a RS too

 

You can also buy a garden variety 283, and bore it .125". Buy a set of zapper pistons, a 30/30 cam, add double hump heads, Z-28 type intake, holley carb, Z-28 springs and you have a 283 on steroids which is probably one of the most popular old school engines ever built. No low end power but motorcycle like rpm capabiltiy.

Use low gears and turn it tight. Upgrade to 10 degree valve locks as the .030" valve lash is hell on keepers and retainers.

 

Afraid not. What do you think the 67 small block SS were powered by?

1967 Camaro Super Sports were 350 and 396.

Rich

PS: Thanks, I think I am a lucky dog too. Have wanted one since I was 16. On top of that is a RS too

dang I forgot about that. Most every 67 SS I saw was a BB. Do your electric doors still work? I hated having to manually open and close my buddies cuz the gears were stripped. In the mid 80's there was one company making replacement gears for the motors. They originals were cheap plastic.

Due to the popularity of punching out the 283's to 301 as they were called, chevy decided to build one that would allow the camaro to go trans am racing. God Bless Vince Piggins.

BTW, my 69, stock short block, 302 turned 8 grand many, many times. I had to shift at 7500 or higher or it would lay down. If I had a real gear like a 5.38's instead of the measly 4.56's the r's would not have dropped so much shifting.

 

dang I forgot about that. Most every 67 SS I saw was a BB. Do your electric doors still work? I hated having to manually open and close my buddies cuz the gears were stripped. In the mid 80's there was one company making replacement gears for the motors. They originals were cheap plastic.

Due to the popularity of punching out the 283's to 301 as they were called, chevy decided to build one that would allow the camaro to go trans am racing. God Bless Vince Piggins.

BTW, my 69, stock short block, 302 turned 8 grand many, many times. I had to shift at 7500 or higher or it would lay down. If I had a real gear like a 5.38's instead of the measly 4.56's the r's would not have dropped so much shifting.

Yes, they did. The car is being restored right now so I guess they dont at the moment You can click my photo album and see a couple pics.

You are correct, the doors had problems. there was a reason they went to vacuum operated later !

My car is a 3:73 rear gear car. But since I you cant see the gear from the outside (this car is a purist restoration) I am changing it out to 4:88. Just easier to drive.

They run great at about 7500 Here is a little story about a ride I took with a close friend. http://www.1967z28.com/chp/chp.htm

Rich

 

Those small journal 1967 350's must be pretty scares, I've never ever seen one. I've never even seen a small journal 350 crank for sale. They were forged or cast? The large journal forged 327 cranks sure are a tough find nowadays, had one awhile back and decided to ebay it, wish I would have kept it now. The cheapest way to build a 302 would be the small journal route, don't forget the rotating assembly will need to be balanced though. Bob

 

Nice story Rich. Brought back many fond memories.

I had many similar rides with both the 70 and 69. I never legally raced the 70 but had an interesting time back in 74. I was driving along side a CHP desert patrol at what is now the west end of Edwards AFB where the shuttle lands. I waved good bye as he pulled away when we hit the mountains.

 

you need a small journal 327 block and a 283 crank...4.00 bore + 3.00 crank=302ci chevy...the 302 chevys where small journals..

only in 67

68-69 they were med journal blocks which means you could use a 305, 307, 327, 350

J

 

my bad 302/z28 i didn't relize you had already posted that answer. i didn't take the time to read the rest of the responses.

i just wanted to tell mr stang lover he better stick to ford, since obviosly he knows little about chevy

J

 

Those small journal 1967 350's must be pretty scares, I've never ever seen one. I've never even seen a small journal 350 crank for sale. They were forged or cast? The large journal forged 327 cranks sure are a tough find nowadays, had one awhile back and decided to ebay it, wish I would have kept it now. The cheapest way to build a 302 would be the small journal route, don't forget the rotating assembly will need to be balanced though. Bob

What is even more scarce than those is a medium journal 302 crank. I have a friend who built a period correct 302 and he paid over $500 for a medium journal (68 & 69) 302 crank that needed a ton of rework.

Vince

 

The 307 was a 283 bore and a 327 stroke. Can you say smog motor?QUOTE]

As delivered I would have to agree, but combine the right aftermarket parts and the 307 will really talk. I had a 70 Nova 2 door sedan, 307 2bbl, 3 speed in 1972. Installed a Crower 280 hydraulic/rev kit, Tarantula intake, Holley 3310, headers, Mallory dual point and a 4 speed and it came alive. The heads never came off the engine. I drove that car back and forth between Abilene, Texas and Nederland, Texas every 2 weeks for almost 2 years. Every other weekend I was at the drag strip in Abilene running very solid mid 13 second passes. I had a dicken's of a time convincing people it was a 307 and not a 350 because of the "smog" reputation the 307 had.

Vince

 

Those small journal 1967 350's must be pretty scares, I've never ever seen one.

CRG estimates 29,270 SS 350s were built.

Speaking of journal size, I grouped the 68 302 in the same journal size with 67 in my above post. 68 was the larger journal.

Rich

 

Just build a 350 with a big solid cam and stick 302 emblems on it. hahahaha

I spin my 350 up to 7200 rpm every time I drive it!

 

350 is my all around favorite smallblock for hotrodding. BUT...

There is nothing quite like the surprise of the 302 when it hits about 6,000.

Very fun motor.


And as far as the 307 comment. I had a couple of those as a kid that Had headers and decent heads on them. Ran pretty well but ended up holing the blocks on both of them

 

And as far as the 307 comment. I had a couple of those as a kid that Had headers and decent heads on them. Ran pretty well but ended up holing the blocks on both of them

Yep, this is eventually what happened to mine. Wednesday night grudge matches at the local strip. Engine had been banging about 5500, thought it was just a plug fouling. Kept pushing it until I dropped a valve. Turns out I had a broken valve spring that was causing the banging at high rpm. When I pulled the head all that was left where the cylinder was was a rod and wrist pin. ain:

Vince