Swapping a 1969 Inline 6 for a 1991 Inline 6 4.9. Please help
#1
12-23-2018, 04:13 PM
Swapping a 1969 Inline 6 for a 1991 Inline 6 4.9. Please help
Hello everyone,
I am new to this site. I have a 1969 wood chipper, it is a Mitts & Merrill chuck and duck style wood chipper. It is powered by a Ford 300 straight 6 with a clutch. Positive ground 12 volt system, generator, Holley carburetor. The rings are stuck on three of the cylinders; Instead of rebuilding it, I bought a 1990 Ford F-150 with a 4.9. The truck has an automatic transmission. I would like to use the components that are on my chipper’s engine- carb, generator, starter, mechanical fuel pump, distributor, intake and exhaust manifold. I am hoping I can swap flywheels too. Does anyone know if the 1990 motor is going to be compatible with all of my components? From research I have done this far, I believe the block did not change from 1960s to 1990s. I do believe my 300 is an industrial engine so that brings up the question as to if anything external dimensions wise is different on the 1990 F-150 4.9. Any help would be appreciated, I am not very familiar with the 300 engines so this will be a learning curve for me. I can be reached at 603 three 2 1 9 five 00. Thank you everyone and have a good holiday.
I am new to this site. I have a 1969 wood chipper, it is a Mitts & Merrill chuck and duck style wood chipper. It is powered by a Ford 300 straight 6 with a clutch. Positive ground 12 volt system, generator, Holley carburetor. The rings are stuck on three of the cylinders; Instead of rebuilding it, I bought a 1990 Ford F-150 with a 4.9. The truck has an automatic transmission. I would like to use the components that are on my chipper’s engine- carb, generator, starter, mechanical fuel pump, distributor, intake and exhaust manifold. I am hoping I can swap flywheels too. Does anyone know if the 1990 motor is going to be compatible with all of my components? From research I have done this far, I believe the block did not change from 1960s to 1990s. I do believe my 300 is an industrial engine so that brings up the question as to if anything external dimensions wise is different on the 1990 F-150 4.9. Any help would be appreciated, I am not very familiar with the 300 engines so this will be a learning curve for me. I can be reached at 603 three 2 1 9 five 00. Thank you everyone and have a good holiday.
#2
12-23-2018, 09:17 PM
I am also not 100% on this swap but I believe everything will swap but ............ the fuel pump.
I say this because the 90 engine is EFI so the block was never machined for it but the pump boss is there.
You can drill and tap for the bolts and cut the center for the pump arm to go thru using the pump gasket.
I was told the cam does have the lobe for the pump arm OR could run an electric fuel pump.
Manifolds should swap as we use the EFI exh. manifolds with the non-EFI intake as a hop up trick.
Other than maybe a different cam I cant see much difference between the 2 motors.
Dave ----
I say this because the 90 engine is EFI so the block was never machined for it but the pump boss is there.
You can drill and tap for the bolts and cut the center for the pump arm to go thru using the pump gasket.
I was told the cam does have the lobe for the pump arm OR could run an electric fuel pump.
Manifolds should swap as we use the EFI exh. manifolds with the non-EFI intake as a hop up trick.
Other than maybe a different cam I cant see much difference between the 2 motors.
Dave ----
#3
12-23-2018, 09:20 PM
Fleet Mechanic
#4
12-23-2018, 09:28 PM
If this will be a causal use chipper then the EFI based 300 should be okay for a while. If you plan on making a living do not use the EFI engine. The engine will not last, the heads, cam,pistons and compression are very different. The EFI engine can be machined to accommodate the fuel pump and all the accessories will bolt up.
#5
12-23-2018, 09:41 PM
Fleet Mechanic
ASSUMING THE ENGINE IS GOOD AND YOUR COOLING SYSTEM IS GOOD i DO NOT SEE WHY YOU SHOULD NOT EXPECT YEARS OF SERVICE FROM IT. bUT THE efi ENGINE HAS A DIFFERENT COMBUSTION CHAMBER DESIGN AND REQUIRES LESS SPARK ADVANCE. sO AS i SEE IT YOU CAN DO ONE OF TWO THINGS:
USE A HIGHER GRADE OF FUEL
or
RETARD THE SPARK AT THE OPERATING RANGE BY ROUGHLY TEN DEGREES FROM WHAT YOUR CURRENT ENGINE HAS. GOOD LUCK
SATCL
USE A HIGHER GRADE OF FUEL
or
RETARD THE SPARK AT THE OPERATING RANGE BY ROUGHLY TEN DEGREES FROM WHAT YOUR CURRENT ENGINE HAS. GOOD LUCK
SATCL
#6
12-23-2018, 09:43 PM
The heads on the industrial version were made to reduce the cracking in the truck head. This is from the 300 industrial guide.
The high swirl Ford 300 cylinder heads produced from 1987 to 1997 have an E 7 casting number and a heart shaped combustion chamber. This is a light duty head and should not be used in an industrial application. The true Ford 300 industrial heads will have an oval or D shaped combustion chamber.
The high swirl Ford 300 cylinder heads produced from 1987 to 1997 have an E 7 casting number and a heart shaped combustion chamber. This is a light duty head and should not be used in an industrial application. The true Ford 300 industrial heads will have an oval or D shaped combustion chamber.
#7
12-23-2018, 09:49 PM
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#8
12-24-2018, 05:58 AM
#9
12-24-2018, 09:16 AM
Fleet Mechanic
#11
12-24-2018, 04:26 PM
All intakes, exhaust and heads should interchange. If you see on the newer engine that the block has the boss for the fuel pump and bolt holes already drilled you can cut a hole in the boss for the old mechanical pump. I did that here in my build (carbed everything on efi block):
https://www.ford-trucks.com/forums/1498226-300-4-9-build-pic-data-heavy.html
id say the best bet is the good block, best shape head, mechanical fuel pump, carburetor and whichever exhaust system its outfitted for now.
https://www.ford-trucks.com/forums/1498226-300-4-9-build-pic-data-heavy.html
id say the best bet is the good block, best shape head, mechanical fuel pump, carburetor and whichever exhaust system its outfitted for now.
#12
12-24-2018, 08:04 PM
#14
12-25-2018, 12:44 PM
Fleet Mechanic
#15
12-26-2018, 04:42 PM
True on V8's, don't think it matters on the 300's. I believe the EFI 300's waterpump has straight vanes on the impeller, so it will work either direction. But he will have to either use the later engines accessory drive or change it all over from the older engine. Including the water pump ( or a new replacement one for the 69 ) . The pulley from the 69 will not fit the newer one due to the larger center for the fan clutch.