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Old 08-11-2005, 07:02 PM
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how to build a 302 chevy

HI, I need some infor i have a '69 camaro i want to clone into a z-28 it has a 4 speed i just want to build a 302 any infor on subject would be welcome. what i guess i want is the 350 4 bolt turned into a 302 .THANKS

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Last edited by 2camarobill; 08-12-2005 at 02:09 PM.
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Old 08-11-2005, 07:11 PM
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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

j
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Old 08-11-2005, 07:19 PM
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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.
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Old 08-11-2005, 07:22 PM
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oh woops, i stuck my whole foot in my mouth that time

i'm sorry i misunderstood the question

J
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Old 08-11-2005, 07:32 PM
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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..
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Old 08-11-2005, 07:36 PM
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OUCH...! A mustang guy shamed you all...
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Old 08-11-2005, 07:41 PM
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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
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Old 08-11-2005, 07:47 PM
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Quote:
Originally Posted by 347mustang
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
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Old 08-11-2005, 07:58 PM
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My '69 DZ has 186 2.02 heads and a Chevy 472 Winters aluminum intake. I think that carb was a Holley 2818.
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Old 08-11-2005, 08:33 PM
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Quote:
Originally Posted by 302/Z28

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?
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Old 08-11-2005, 08:40 PM
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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
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Old 08-11-2005, 08:48 PM
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Quote:
Originally Posted by rrmccabe
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.
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Old 08-11-2005, 08:51 PM
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Quote:
Originally Posted by larryblack
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

Last edited by rrmccabe; 08-11-2005 at 09:07 PM.
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Old 08-11-2005, 08:54 PM
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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.
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Old 08-11-2005, 09:17 PM
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Quote:
Originally Posted by rrmccabe
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.
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