MrE_Powers
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difference 5.0 -302
originally posted on TRS v.2 by ranger306ci
To answer the question that keeps popping up, here is the following info that I have found through my own research over time. I will keep editing this as I find more info.
1) the 302 and 5.0 are basicly the same engine. 5.0 is just the metric equivalent of 302ci.
2) The 2 blocks are basicly the same. However, blocks have had some differences over the years:
a) around 1982/83 the block went from a 2 piece rear seal,
to a one piece.
cool.gif around 1980, the dipstick move to the block. Prior, it was either
in the pan, or timing cover.
c) early to mid '80s blocks are thin wall cast; not as strong.
d) mid '80s to end of production are tapped to accept a roller lifter
spider, and the lifter bores are taller.
3) Crankshaft:
a) around 1980/81 the balance changed. earlier balance was
28oz, later balance was 50 oz.
cool.gif around 82/83 the end of the crank was slightly changed for the
rear seal change. However, minor machining allows either
crank to work in either block. there is a oil slinger ring that
need to be removed.
4) Balancers/Dampers:
a) 28 oz dampers are 3 bolt
cool.gif 50 oz dampers are 4 bolt
c) around '85, timing marks moved from the passenger side of the
engine to the driver side.
5) Cam and Lifters:
a) 302 and regular 5.0 have 1 firing order.
cool.gif 5.0 ho and 351W has a different one. BOTH FIRING ORDERS
WORK WITH THE SAME CRANKSHAFT!
c) Around 85/86, started using roller lifters on some aplications.
6) Distributers:
a) 2 different shaft diameters; 0.50 and 0.467. I have also seen
gears for sale that are for 0.531. Not sure what dizzy that
would fit, maybe aftermarket?
cool.gif cast gears for hydralic tappet, steel gears for rollers. Bronze
will work for both.
7) Timing Covers:
a) three styles:
1) early style has a dipstick port, and fuel pump boss
2) mid style has no dipstick port, but has fuel pump boss.
3) late model does not have a fuel pump boss.
Heads:
All 302/5.0 heads will fit and work on all blocks!
Early '80s had the largest compustion chambers and thermactor
bosses, make really good boat anchors!
GT-40P heads have a different plug angle.
289,302,5.0,351 winsor heads will interchange, but the 351 heads
use 1/2" head bolts!
added by baddad457
Here's an addition to your list: The balancer info is incorrect, the switch to a 4 bolt 28 oz/in was made in 1970, thus a 28 oz/in balancer can be either 3 or 4 bolt. -------- Next, there are more than 3 variations of small block timing covers. You left out the reverse rotation variation, of which there are at least 3: The Stang/pickup truck cover, then the Explorer/Mountaineer cover, and finally the 94-95 Stang cover. The earlier covers are even more numerous, ther being at least 5 that I'm aware of. Two of these are for passenger side inlet water pumps.--------------------Then in addition, some of the early 80's blocks are not thin wallled. The D8VE block is a thick walled design. This block was first cast in 78 and was used in Lincolns and others till sometime in the early 80's.
from pacer88220
The reason for timing change was the cam. It is a 351 based cam. The cranks changed balancing and seal surface ends but not molds. If they did not by much my 68 looked like the 89 in every way other then forging and seal ends.
They make a kit to install 1 piece seal in two block's and vice versa only reason I could think one would want to though is to use the forged 289 crank.
mudd The difference between an h.o and and a non h.o is the cam. There are a few other things changed as well but depends on year it was made.
If carbed h.o cam and carb were different along with free-er flowing heads and exhaust.
If fuel injected it depended upon year. Say 89 they made sequential injection to match the firing order of the motor and it had mass air.
Intakes heads computer are the biggest difference.
Keep in mind the engineers were trying new stuff all the time to help it meet epa and consumers demands thats why so many changes. Only if I had a job I could beat up new toys before they were handed out.
Mudd which year are you askin for?
originally posted on TRS v.2 by ranger306ci
To answer the question that keeps popping up, here is the following info that I have found through my own research over time. I will keep editing this as I find more info.
1) the 302 and 5.0 are basicly the same engine. 5.0 is just the metric equivalent of 302ci.
2) The 2 blocks are basicly the same. However, blocks have had some differences over the years:
a) around 1982/83 the block went from a 2 piece rear seal,
to a one piece.
cool.gif around 1980, the dipstick move to the block. Prior, it was either
in the pan, or timing cover.
c) early to mid '80s blocks are thin wall cast; not as strong.
d) mid '80s to end of production are tapped to accept a roller lifter
spider, and the lifter bores are taller.
3) Crankshaft:
a) around 1980/81 the balance changed. earlier balance was
28oz, later balance was 50 oz.
cool.gif around 82/83 the end of the crank was slightly changed for the
rear seal change. However, minor machining allows either
crank to work in either block. there is a oil slinger ring that
need to be removed.
4) Balancers/Dampers:
a) 28 oz dampers are 3 bolt
cool.gif 50 oz dampers are 4 bolt
c) around '85, timing marks moved from the passenger side of the
engine to the driver side.
5) Cam and Lifters:
a) 302 and regular 5.0 have 1 firing order.
cool.gif 5.0 ho and 351W has a different one. BOTH FIRING ORDERS
WORK WITH THE SAME CRANKSHAFT!
c) Around 85/86, started using roller lifters on some aplications.
6) Distributers:
a) 2 different shaft diameters; 0.50 and 0.467. I have also seen
gears for sale that are for 0.531. Not sure what dizzy that
would fit, maybe aftermarket?
cool.gif cast gears for hydralic tappet, steel gears for rollers. Bronze
will work for both.
7) Timing Covers:
a) three styles:
1) early style has a dipstick port, and fuel pump boss
2) mid style has no dipstick port, but has fuel pump boss.
3) late model does not have a fuel pump boss.
Heads:
All 302/5.0 heads will fit and work on all blocks!
Early '80s had the largest compustion chambers and thermactor
bosses, make really good boat anchors!
GT-40P heads have a different plug angle.
289,302,5.0,351 winsor heads will interchange, but the 351 heads
use 1/2" head bolts!
added by baddad457
Here's an addition to your list: The balancer info is incorrect, the switch to a 4 bolt 28 oz/in was made in 1970, thus a 28 oz/in balancer can be either 3 or 4 bolt. -------- Next, there are more than 3 variations of small block timing covers. You left out the reverse rotation variation, of which there are at least 3: The Stang/pickup truck cover, then the Explorer/Mountaineer cover, and finally the 94-95 Stang cover. The earlier covers are even more numerous, ther being at least 5 that I'm aware of. Two of these are for passenger side inlet water pumps.--------------------Then in addition, some of the early 80's blocks are not thin wallled. The D8VE block is a thick walled design. This block was first cast in 78 and was used in Lincolns and others till sometime in the early 80's.
from pacer88220
The reason for timing change was the cam. It is a 351 based cam. The cranks changed balancing and seal surface ends but not molds. If they did not by much my 68 looked like the 89 in every way other then forging and seal ends.
They make a kit to install 1 piece seal in two block's and vice versa only reason I could think one would want to though is to use the forged 289 crank.
mudd The difference between an h.o and and a non h.o is the cam. There are a few other things changed as well but depends on year it was made.
If carbed h.o cam and carb were different along with free-er flowing heads and exhaust.
If fuel injected it depended upon year. Say 89 they made sequential injection to match the firing order of the motor and it had mass air.
Intakes heads computer are the biggest difference.
Keep in mind the engineers were trying new stuff all the time to help it meet epa and consumers demands thats why so many changes. Only if I had a job I could beat up new toys before they were handed out.
Mudd which year are you askin for?