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Old 06-19-2010, 11:32 AM
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302 Z Engine Dilemna

Ok here we go........ I recently purchased a bone-stock 68 camaro that had been sitting for a few years; you know the one.....powerslide tranny, was probably a 327 or maybe a 307 originally. The seller put a different engine in it....said he thought it was a 327. It had aluminum intake and a old-*** Holley on it, chrome shorty headers but other than that no real great attributes. I am presently striiping this car and fixing all the backyard body work previously performed. All new sheet metal, tubbed. I have line on an all aluminum 427 complete from the late 60's. 4-link in the rear, tube A-arms and 4-wheel disc with a Tremec 6-spd. Gonna be a serious sleeper!!!!

OK now getting to my dilemna... The "327" as stated by the seller was going into my 67 RS Irecently acquired. I started to tear down the engine and to my surprise it has 4-bolt mains. The 327 did not come with that option. I has a .040 over 4" bore. So.......I checked the casting indicates a 69 302
and now the dliemna. The block pad numbers do not show the "DZ" and it looks as if someone used large letter/number stamps and stamped very deep
letters/numbers on the pad. Normally the stamping is not very deep and a little engine paint can make the numers and letters hard to read and you may have to scrape the paint off to make reading possible. The stamping on this one is Very deep......SO.... Now I double-checked the casting number and found the same number can indicate a 69 327 industrial or truck engine BUT it only came with 2-bolt mains ANYONE?????????? Seems to me by deductive reasoning this should still be a 302.. WHAT DO YOU THINK?

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Old 06-19-2010, 02:05 PM
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What are the numbers on this block, front and back?
The casting numbers on the heads?
If you have the heads off, but the block is still in the car, you can find the stroke by measuring the piston's travel from BDC to TDC. That alone will tell you whether you have a 302, 327, or 350 (assuming you have a 4-inch bore).

edit: I just re-read your post. Since you know you have a 4-inch bore already, finding the stroke is all you need. Is the crank steel or cast? Are the rods 2-shoulder, or 4-shoulder?

Last edited by a1supersport; 06-19-2010 at 02:14 PM.
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Old 06-19-2010, 02:42 PM
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I haven't removed the crank yet, the stroke (with current crank) is, I believe, 3.5". The heads are not the correct ones - they correspond to 69 307/327/350. couldn't tell you if there were solid lifters in it either (my brother thru all away when he removed heads). I do have a set of 66 camel-backs I can use if needed, but trying to determine actual block first. What numbers should I be looking for on the frt of block other than on the r/f pad area? Did the true 302 have a cast or steel crank? Finding info (reliable) on these has been tedious. Thanks for the reply
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Old 06-19-2010, 02:52 PM
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If it's a 4-bolt, it's a LJ. Without a suffix saying it was for the 302 (MO, MP, MS, MT, MU, DZ) it's just another LJ 4-bolt 350 block.

The c/n -010 is the most common. -386 and -618 are possibilities that could have been a 302 or 350 w/4-bolt. Still needs the suffix, though.

FWIW, there are thousands of 4-bolt LJ blocks w/LJ 327 cranks in them. Very common to have been put together by enthusiasts.

EDIT- I just saw that it has a 350 crank in it. Would make me suspect that that is exactly what it is- a 350 that happens to share a block casting number that was also used as a 302.
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Old 06-19-2010, 03:07 PM
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arrrghh. double-post.
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Old 06-19-2010, 03:08 PM
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Quote:
Originally Posted by cobalt327
it's just another LJ 4-bolt 350 block..
That's what I was thinking when I saw stroke, 3.5" (3.48).
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Old 06-19-2010, 03:19 PM
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OK, makes sense but the only year shown with this casting number (according to my small block interchange book) is 69 and the only two options for this were the 4-bolt 302 or 2-bolt 327??????????
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Old 06-19-2010, 03:27 PM
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Quote:
Originally Posted by SAVINGDETROITMUSCLE
OK, makes sense but the only year shown with this casting number...
Which is???
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Old 06-19-2010, 03:43 PM
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8919803 Is The Number
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Old 06-19-2010, 04:03 PM
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Quote:
Originally Posted by SAVINGDETROITMUSCLE
8919803 Is The Number
From HERE. That would be 3919803. Matches up to a 327/350 '67-'68 4-Brl Quadrajet.

Casting numbers are notorious for being difficult to read.

Good block to build with.
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Old 06-19-2010, 04:35 PM
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I will have to double check when I get home that is a number I had on a scrap of paper......well ---- at this point it does not matter quite honestly. I am ok if it IS a 327 ---- always liked that one. easier and cheaper to get parts for and I don't have to beat myself up to find OE parts to make it a 302.
great hp/lbs ration anyway. just glad its not a 307.

Thanks for the replies - been cool.

What are you building? any projects in the fire?
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Old 06-19-2010, 04:44 PM
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Quote:
Originally Posted by SAVINGDETROITMUSCLE
I will have to double check when I get home that is a number I had on a scrap of paper......well ---- at this point it does not matter quite honestly. I am ok if it IS a 327 ---- always liked that one. easier and cheaper to get parts for and I don't have to beat myself up to find OE parts to make it a 302.
great hp/lbs ration anyway. just glad its not a 307.

Thanks for the replies - been cool.

What are you building? any projects in the fire?
All I have going on is trying to find a rear main cap for a standard bore 400 block, and deciding what to do w/a blown (needs crank) L31 5.7 Vortec engine. Most likely I will do a *yawn* 383 out of it... but it's a 2-bolt, so I might just go back to a 350 crank, I'm not going to do a splayed cap deal...

Back to your deal- I thought you said the crank was a "3.5"? If so, you have a 350 (4" bore X 3.48" stroke), better power-wise than a 327 if this IS the case.
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Old 06-19-2010, 04:52 PM
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Oh...my...gosh.

Threw two sets of 400 caps away. 2-bolt and 4-bolt.
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Old 06-19-2010, 05:54 PM
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Quote:
Originally Posted by a1supersport
Oh...my...gosh.

Threw two sets of 400 caps away. 2-bolt and 4-bolt.
AAK!! Oh well... day late, dollar short... lol
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Old 06-21-2010, 06:33 PM
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I checked another listing and it is a 69-72 350 4-bolt the casting no. does begin wth a "3" Still happy with the 350 though

Speaking of Vortec...........I have an edelbrock alum intake and some generic chrome bowtie valve covers for that
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