My son (16) has a 70 with a very tired 300, he wants a V8 but wants to stay with the 3 on tree he has now... I have access to a 71 with 302 and 3 on tree... besides the frame pedistals for motor mounts, clutch, flywheel and linkage,, what will I need to do this thing??

thanks in advance for all the help you give me.

thatdude

 

The bell housing for the 300 I-6 is the same one that
is also used for the Windsor series blocks (255/289/302/351W)

 

Thanks serian, thats good to hear, its probably a beginners question but Ive always known V8's better.

 

if it were my truck, I would sell the v-8, rebuild the six . then I would find a zf 5 speed overdrive.
the only way i would consider a v-8 is if it were a 351w or a 460!!.

 

The swap is easy (from a 6 to 351w). My results were: better gas mileage, a cool V8 sound (headers and dual exhaust), and more buildable horsepower and torque. I swapped the 6 for a 351 and could not be happier. There are a couple of people who have done the swap and can help. Myself, slikness, and Hotwhlz85 have all done the swap.

 

what would be a rough idea of gas milage for you who did do the swap? i do a lot of city driving and some highway. im thinking of swapping out the 300 because there isn't much power

 

I went from around 12 mpg with the EFI 300 to 18-19 mpg with the EFI 351w. I replaced the stock mechanical fan with an electric fan. I think that was my biggest mileage per gallon gain.

 

hey swirk i was curious i have a new 351w in a crate and i also have a 95 w/300-6 what did u hafta change as far as computer stuff and what kinda cost am i looking at?

thanks for the info.
Evan

 

I agree with billyb. loose the 302. rebuild the 300. if you must get a v-8 then by all means go with a 351W. I also agree with the ZF-tranny. it is stout should work out good.

 

Unless you go with a windsor rebuild the 300 it'll out work and run the 302. I would never swap a 300 for a 302 unless it was a efi roller motor. I had a 82 f150 someone put a 5.0 mustang engine in it and used a 4barrel carb and intake it was a dog.

 

If you only get 12 mpg with an EFI 300 there is something wrong. Even with bigger injectors, no EGR, etc. and over 220k miles I still average 15 driving like I stole it.

The 302 is no match for a 300. The 351 is iffy if you put some work into the 300. Plus, if you keep the 300 people think it's cool. If you do a 351 it's just another truck with a 351. Kinda like a street rod with a 350, everybody's seen it countless times and it isn't that cool anymore.

 

I'm with Silver Streak on this one the 300 is a WAY kewler motor then some panzy arsed v-8.

 

silver streak I really like your take on the street rods and agree 10000000000000%

 

Actually with my '93 300 with an auto and towing package i only get 12 per gallon... and it tends to be 12 city, 12 highway, 12 uphill, 12 towing... generally it's right around 12 no matter what...

-Necro

 

I just got back from the IRL race in Fort Worth. On the first leg of the trip from here to Ardmore(30 miles north of TX)I got right at 17 mpg driving into a stiff south wind at about 70 mph. On the second tank we went from Ardmore to the inlaw's house in FW, drove around for two days (including stop and go in race traffic), and then to just north of Denton and got about 17 mpg. From Denton to OKC I got 19.3. I gassed up in OKC and drove home and am still driving on that tank. I drive like a maniac. WOT all the time in town, rubber in first three gears, powershifting, etc. Something is wrong if you can't get at least 15 mpg with a EFI 300.

BTW, I'm in the Tulsa area.