Going to be rebuilding a 300 inline 6. Looking for general info/ideas from guys who have done it before on this engine.

 

What year engine? whats it going into? budget? skill level?

search around here and fordsix forums for a wealth of info.

 

Engine year is '81, is in an '81 F-250, don't really care about cost within reason, not very experienced but have 3 good friends and a grandpa who are mechanics.

 

This is what I would do if I wanted a bit more power and a reasonable budget.

Comp 252 cam.
EFI exhaust manifolds with a cheeper turbo muffler. (Assumes your doing your exhaust.)
Full rebuild.

More power yet?,

Switch to a comp 260 cam.
Same exhaust.
Offy DP manifold with a small 4 barrel carb.
Full premium rebuild.
That is pretty much the basic processes for hopping up a carbed 300.

 

I just finished swapping a 390 in my75 F-250 for a built 300. My goal was to equal the hp of the 390 with a 2v carb, but still obtain 50% better mpg. I would advise you in this way: Decide what you want to achieve with hp, mpg, performance, etc, and do the research required to find what is out there, and what the results are.

Start with Clifford Performance. Google them. Read. He has a good built 300 which he sells everything for, which will produce 300 hp! I used that build as a guide, but didn't want it that radical, didn't want to turn the highschool kids heads and pass everything but the gas stations, so I toned it down and shot for about 250 hp...plenty of power, but still a dependable daily driver that can snap your head back.

If you go on youtube, or google ford 300 cam, you'll see the clifford build on an older truck, and hear it too.

My advice: Go with a 4v carb, 600 to 650 cfm if you want power; 500 cfm if you use the over size valves as the Clifford build, and want power yet mpg. If not using the over size sbc valves, about 400-500 cfm dialed in is about right. IF YOU WANT ANY KIND OF PERFORMANCE, YOU HAVE TO PORT AND POLISH THE HEAD, WITHOUT QUESTION.

If you're not going to replace the stock intake and p&p the head, then don't expect much.

There are about a million other things I could tell you. Check out my thread, 390 to 300 swap. I have a lot of photos listed. You'll have to go back a few pages to find it. Good luck. The research is the most important part of the process.

 

The ultimate street build for a 300 is possessed by Col. Flashman. Some info here: https://www.ford-trucks.com/forums/3...0-i-6-a-3.html

 

Yes, he has an awesome engine. However, I notice he is at 10:1 compression. That means he is not on regular gasoline. I notice he also went with a .060 over bore. That is how he got the high compression pistons. He is most likely using 390 pistons.

I would guess that around town he is getting 7-8 mpg, and using high grade gas. That is why I toned down my project.

I also noticed that he went with a high volume oil pump. Very interesting.

All in all, I am very impressed with Col. Flashman's build. He has a very nice engine there. I wonder if he forgot to mention over size valves.

 

Yank out that 300 and drop a small-block Chevrolet in the truck.

 

get a life. he said he is going to rebuild his 300i6. so let him.

 

I would highly recommend speaking with Iskenderian racing cams or Crower. They have both been in the business (or worked building cam components)since the 40's. Comp has good grinds but they are one of the Mfg's whose products have experienced lobe failures - reportly due to the reduced zinc/phosphorus levels in the new oils. While many have thoughts and opinions, & i clearly don't know enough about Comp Cams products to make any suggestion whether they are good/bad, but to quote Harvey Crane, a very famous cam grinder

"Parkerizing is the final step that some big name cam companies will not even offer, and a crucial step to help break the cam in (a heated acid bath that microscopically etches the metal surface and adds a very thin layer of graphite coating which allows the cam lube to hang onto and penetrate into the cam surface during cam break in".

I can safetly state that Isky has one of the best QA sop's in the business- I know of no other mfg that automatically checks every single valve spring befor it leaves the shop. Both Isky & Crower depending on the grind, regrind your own cam saving you $'s. I would have also recommneded Crane & Sig Erson but they are no longer in business (both sold their businesses to fortune 500 companies IIRR)

 

Hey breisr!! What's up?

How am I going to keep him from doing anything? If he wanted to he could saw off his own ear and cook it. If he wants to rebuild his 300 then he will!

A SBC would make three times the power for half as much.

Haha.. I love people's reactions to that!

 

Sorry Bill, I over reacted a BIT. Bad day overall.

 

No problem breisr. If you knew me, you would know I go around telling people to put SBC's in their Fords. I like to watch their reactions.

Sorry you had a bad day! Look at the bright side.

 

Bill is an incorrigible agitator...and enjoys it too. LOL

 

That's right I enjoy it. If I don't have anything to add.. the answer is always SBC!