Carb vs. EFI Head Difference
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Joined: Dec 2004
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Carb vs. EFI Head Difference
I'm considering converting my 79 F250 w/ 460 to EFI using late 80s EFI components (intake, injectors, fuel rails, etc) and likely Megasquirt for control. I'm aware that there is a significant difference between carb heads and EFI heads regarding lineup of intake passages. Thus, I know I'll need to use EFI heads in order to use the EFI intake. My question regards the exhaust side. I have some high $$ L&L fenderwell headers that I don't want to give up. Does anyone know how the EFI heads match up to the Carb heads on the exhaust side?
Thanks,
Jeff
Thanks,
Jeff
Mountain Pass
Joined: Aug 2004
Posts: 143
Likes: 3
From: Tacoma, WA.
I'm considering converting my 79 F250 w/ 460 to EFI using late 80s EFI components (intake, injectors, fuel rails, etc) and likely Megasquirt for control. I'm aware that there is a significant difference between carb heads and EFI heads regarding lineup of intake passages. Thus, I know I'll need to use EFI heads in order to use the EFI intake. My question regards the exhaust side. I have some high $$ L&L fenderwell headers that I don't want to give up. Does anyone know how the EFI heads match up to the Carb heads on the exhaust side?
Thanks,
Jeff
Thanks,
Jeff
The EFI cylinder head exhaust bolt centers are raised .560" of an inch vs all early castings. In addition the headers for the early castings will not seal at the top of the fuelie castings exhaust ports unless you drop the header flange by redrilling the holes.
The later F3TE heads have a larger itake valve than the E7TE castings and flow better on the intake side. If you upgrade the intake valve on the E7's to the 2.08" size valve with a 1.89" vertical bowl hog they will flow to with in a few cfm of the F3's.
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gman21583
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 17, 2015 01:51 PM
