Engine Option, unusual to me
Thread Starter
Race Director
Joined: Dec 2000
Posts: 10,896
Likes: 2
From: CO
Engine Option, unusual to me
A stroked 283. Stroked to 327.
I don't know much about 283's except I guess its a casting from 1964. Also I would think it a bit odd to have this engine in a 75 Corvette. Guy wants $2k for it. I know his son and thats how I heard about it. Just curious what the forum thinks.
Block casting code 3834810
1. TRW 11.5 FORGED STANDARD PISTONS
2. MOLY RINGS SEALED POWER
3. ARP ROD BOLTS
4. 10/10 STEEL SMALL JOURNAL CRANK
5. NOS 8 INCH FACTORY BALANCER
6. CLEVITE BEARINGS
7. MELLINGS HV PUMP, PICK UP. AND SCREEN
8. MOROSO OIL PUMP SHAFT
9. ARP HOLD DOWN BOLT
10.CLOYES 2X ROLLER CHAIN
Heads Casting code 3890462
Fuelie heads fresh with steel 2.02 and 1.65 valves, screw in 3/8" studs
1.5 Scorpion Roller Rockers
Cam - Doug Herbert CC5B
Duration Int. 284 at .050 246
Exh. 287 at .050 247
Lift Int. 498 Exh. 500
Lobe Sep. 108 degrees
Valve Lash = 25
Mallory Distributor # 2548201H (gap= .022")
I don't know much about 283's except I guess its a casting from 1964. Also I would think it a bit odd to have this engine in a 75 Corvette. Guy wants $2k for it. I know his son and thats how I heard about it. Just curious what the forum thinks.
Block casting code 3834810
1. TRW 11.5 FORGED STANDARD PISTONS
2. MOLY RINGS SEALED POWER
3. ARP ROD BOLTS
4. 10/10 STEEL SMALL JOURNAL CRANK
5. NOS 8 INCH FACTORY BALANCER
6. CLEVITE BEARINGS
7. MELLINGS HV PUMP, PICK UP. AND SCREEN
8. MOROSO OIL PUMP SHAFT
9. ARP HOLD DOWN BOLT
10.CLOYES 2X ROLLER CHAIN
Heads Casting code 3890462
Fuelie heads fresh with steel 2.02 and 1.65 valves, screw in 3/8" studs
1.5 Scorpion Roller Rockers
Cam - Doug Herbert CC5B
Duration Int. 284 at .050 246
Exh. 287 at .050 247
Lift Int. 498 Exh. 500
Lobe Sep. 108 degrees
Valve Lash = 25
Mallory Distributor # 2548201H (gap= .022")
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
You sure it's not a real 327?...A 283 with a 327 crank yields 307 C.I. (Different bore diameter). Also, it sometimes takes alot of grinding to fit a 327 crank into a 283 block....unless it is a 1962 block.
Melting Slicks
Joined: Dec 2004
Posts: 2,161
Likes: 0
From: pr, frederick md.
Originally Posted by 72 stingray owner
An iron headed car with 11.5 CR...I think you might have trouble with detonation, even on 93 gas. Can you get good gas for it?
trw
trw
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
Originally Posted by redc3
again, the type of material has little or no effect in this area. i have read tech articles that state iron heads HELP with this problem.
BigBlockk
Later.....
Team Owner
Joined: Feb 2005
Posts: 32,519
Likes: 1
From: central America
St. Jude Donor '08-'09
Originally Posted by redc3
again, the type of material has little or no effect in this area. i have read tech articles that state iron heads HELP with this problem.
trw
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Team Owner
Joined: Jun 2000
Posts: 38,923
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From: Southbound
Cruise-In II Veteran
Originally Posted by 72 stingray owner
So why did GM drop compression of the engines if high compression cast iron can run on the lower octane pump gas?....trw
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
Originally Posted by Easy Mike
To meet emissions requirements for the equipment they had at that time as cheaply as they could.
Both L-48 and L-82 engines meet emission standards...L-82 engines have at least 1/2 point higher compression...Many of us on the forum have 10.5 to 11.0 in our street vettes using aluminum heads..
Advanced
Joined: Jan 2003
Posts: 96
Likes: 0
From: Austin TX
This sound odd. If I remember correctly you would have to bore the 283 .125" to get to a 327 bore. The old blocks were thick, but that's really pushing it. Even if it works, you could not bore that block any further.
Why would you want a low nickel block with small cubic inches and no further rebuilds, when you could get a newer high nickel block (wears much longer) with more cubes?
Are you getting just the engine or the whole car? If the price includes the car, it might be a good deal. However, if you are buying the engine only, and it is not a valuable block for some other reason, I think I would get some other engine.
I cannot find that engine casting number on this list:
www.nastyz28.com/sbcmenu.html
Why would you want a low nickel block with small cubic inches and no further rebuilds, when you could get a newer high nickel block (wears much longer) with more cubes?
Are you getting just the engine or the whole car? If the price includes the car, it might be a good deal. However, if you are buying the engine only, and it is not a valuable block for some other reason, I think I would get some other engine.
I cannot find that engine casting number on this list:
www.nastyz28.com/sbcmenu.html
Drifting
Joined: Nov 2004
Posts: 1,971
Likes: 7
From: Longwood Florida
A little before my time... but the 350 and 327 and chevy 302 all use a 4 inch bore. The crank stroke is what changes the cubic inches. I am sure that big_G is right the 307 and 283 use the small piston.
You can make 302 with a 350/327 block and 283 crank I think? And 283 with a 327 crank makes a 327?? something like that!
You can make 302 with a 350/327 block and 283 crank I think? And 283 with a 327 crank makes a 327?? something like that!
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Originally Posted by holley505
A little before my time... but the 350 and 327 and chevy 302 all use a 4 inch bore. The crank stroke is what changes the cubic inches. I am sure that big_G is right the 307 and 283 use the small piston.
You can make 302 with a 350/327 block and 283 crank I think? And 283 with a 327 crank makes a 327?? something like that!
You can make 302 with a 350/327 block and 283 crank I think? And 283 with a 327 crank makes a 327?? something like that!
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
Originally Posted by gerry72
You pretty much remember your stuff. But, again, you get into crank and rod journal problems when you fail to take into account the large and small journal stuff. For instance: Only way to make a 302 using a 327 block and 283 crank is to get a small journal 327 block. But the real DZ 302 didn't use a 283 crank to make this displacement, just in case this comes up. There is no way to make a 302 out of a 350 block using factory parts since there were no small-journal 350 blocks or large-journal 283 cranks. The math works out right but there are no factory parts to do this.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Originally Posted by big_G
Why would a 302 block be different? The '67 302 rods were small journals, '68 and '69 were large journal. The main journals are the same. The bore is 4.00 in.. The 302 and 283 share the same 3.00 stroke.
Team Owner
Joined: Feb 2005
Posts: 32,519
Likes: 1
From: central America
St. Jude Donor '08-'09
Originally Posted by Easy Mike
To meet emissions requirements for the equipment they had at that time as cheaply as they could.
http://www.chm.bris.ac.uk/motm/leadtet/leadh.htm
The above link explains the chemistry.
<now donning flame suit>
trw
Melting Slicks
Joined: Jul 2005
Posts: 2,545
Likes: 3
From: 406ci SB, AFR 180 Heads - 490 HP @5,600 RPM 529 lb-ft @ 4,100 RPM
Kinda makes those who just go out and buy a motor and stick it in over a couple of beers with a few friends seem simple. The only math I need to know is 12 empty beers means 12 more needed = pass another wrench thingy.
Good debate guys, keep it going.
Good debate guys, keep it going.
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
Originally Posted by redc3
yea that is the common falshood that everyone is feed. just like batteries on concrete. the only true advantages with aluminum heads are weight savings and bragging
BigBlockk
Later.....
Melting Slicks
Joined: Jan 2004
Posts: 2,672
Likes: 1
From: New Cumberland PA
Originally Posted by Glass Act
Kinda makes those who just go out and buy a motor and stick it in over a couple of beers with a few friends seem simple.
As far as iron vs alum heads. Alum heads not only tolerate more compression, but need more compression to make the same power as iron. Benefit of alum is the weight savings, easier porting, and perhaps advanced design (mainly due to high hp applications).
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
Originally Posted by holley505
A little before my time... but the 350 and 327 and chevy 302 all use a 4 inch bore. The crank stroke is what changes the cubic inches. I am sure that big_G is right the 307 and 283 use the small piston.
You can make 302 with a 350/327 block and 283 crank I think? And 283 with a 327 crank makes a 327?? something like that!
You can make 302 with a 350/327 block and 283 crank I think? And 283 with a 327 crank makes a 327?? something like that!
BigBlockk
Later.....
