1979 460
Thread Starter
|
Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
1979 460
My dad has his first car. A 1979 Bronco Ranger XLT. He just got a newer 1996 Bronco because he gave me the 79. Here in california it doesnt pass smog with it's 351m which is a 400. He wants to replace it with a newer 460 engine. It will de-value what the truck is worth tho.
So would a 1979 Ford 460 smog in california better than the 351m (400)?
The 351 has a 4BBL carb and a high performance cam with dual exaust. It was a lemon from the factory so my dad had to do a little tinkering with it. I think the engine is great besides the fact it doesnt pass california smog.
So would a 1979 Ford 460 smog in california better than the 351m (400)?
The 351 has a 4BBL carb and a high performance cam with dual exaust. It was a lemon from the factory so my dad had to do a little tinkering with it. I think the engine is great besides the fact it doesnt pass california smog.
Post Fiend
Joined: Nov 2009
Posts: 7,669
Likes: 2
I dont think an EFI 460 will de-value a 73-79 truck. Its not like you see them crossing the line at Barrett-Jackson on a regular basis.
You either have a 351m or a 400. A 351m is not magically a 400 because it has the M behind the numbers. From an outside appearance they are identical engines.
I dont know anything about smog engines other than rip it all off and start making horsepower. Maybe someone here can help you detune your current engine or make some suggestions otherwise.
You either have a 351m or a 400. A 351m is not magically a 400 because it has the M behind the numbers. From an outside appearance they are identical engines.
I dont know anything about smog engines other than rip it all off and start making horsepower. Maybe someone here can help you detune your current engine or make some suggestions otherwise.
Junior User
Joined: Jun 2011
Posts: 59
Likes: 0
From: Danbury NC
de-value with a 460
My dad has his first car. A 1979 Bronco Ranger XLT. He just got a newer 1996 Bronco because he gave me the 79. Here in california it doesnt pass smog with it's 351m which is a 400. He wants to replace it with a newer 460 engine. It will de-value what the truck is worth tho.
So would a 1979 Ford 460 smog in california better than the 351m (400)?
The 351 has a 4BBL carb and a high performance cam with dual exaust. It was a lemon from the factory so my dad had to do a little tinkering with it. I think the engine is great besides the fact it doesnt pass california smog.
So would a 1979 Ford 460 smog in california better than the 351m (400)?
The 351 has a 4BBL carb and a high performance cam with dual exaust. It was a lemon from the factory so my dad had to do a little tinkering with it. I think the engine is great besides the fact it doesnt pass california smog.
1979 Ford F250 with a 460
Thread Starter
|
Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Its a bored out 351m, sry about the confusion. And it will smog if you take it to a guy who will overlook the aftermarket things done to it. And what they do is tweak the gas down to where the engine barely runs and when it passes they turn it back up.lol Its a pain to keep doing that tho. California has some really stupid laws and regulations.
Post Fiend
Joined: Nov 2009
Posts: 7,669
Likes: 2
The difference between a 351m and a 400 is the crank. The bore is identical but not the pistons.
400 = 4" bore x 4" stroke
351 = 4" bore x 3.5" stroke
assuming .060 over (probably max safe overbore - not sure on this family) youve got about a 362.
How often will you have the SMOG deal inspected? What if you painted the intake the same color as the block? It shouldnt be that difficult to detune this thing because it doesnt sound like its something incredibly radical.
400 = 4" bore x 4" stroke
351 = 4" bore x 3.5" stroke
assuming .060 over (probably max safe overbore - not sure on this family) youve got about a 362.
How often will you have the SMOG deal inspected? What if you painted the intake the same color as the block? It shouldnt be that difficult to detune this thing because it doesnt sound like its something incredibly radical.
Posting Guru
Joined: Oct 2010
Posts: 1,186
Likes: 1
From: townsend DE
you cant bore a 351 to a 400, stroke sure, bore no. "turning the gas down to where it barely runs", not really sure what that means but im sure if the motor is barely running then thats part of your problem right there.
Thread Starter
|
Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
My Dad said it cam from the factory bored to a 400. And when they turn the gas down to where it barely runs, it puts out less whatever they check for when they smog your car. When it passes, they turn it back up. It also doesnt pass visual because we changed it out to a dual exaust, new cam, and intake manifold with 4BBL carb. Idk what the laws are in other states, but California says u cant change the stock engine or parts. If you put a new engine in it, you have to take it to some guy that works for the state (or something like that), and he has to inspect the changes and give it a ok or a fail. All this ive heard is only here in Cali.
Trending Topics
Post Fiend
Joined: Nov 2009
Posts: 7,669
Likes: 2
You arent listening.
Or maybe we're wrong and your dad got one of those "special" blocks that will take a .250 overbore.
Or maybe we're wrong and your dad got one of those "special" blocks that will take a .250 overbore.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
It's like "alpha/omega" said, "400= 4" bore x 4" stroke"351=4" bore x 3.5" stroke"
and the M does not stand for 'modified' ,it's just a way too identify it from the other 351 engines made by ford.
Thread
Thread Starter
Forum
Replies
Last Post
KevinsMom
Bronco II
12
Aug 27, 2014 11:53 AM
TheDesertRat
1973 - 1979 F-100 & Larger F-Series Trucks
6
May 22, 2010 09:33 PM
blake_001_2000
1973 - 1979 F-100 & Larger F-Series Trucks
20
Aug 3, 2007 11:34 AM
