Originally Posted By: Tracker64
Originally Posted By: gbauer
I believe a 1974 250 is non-integrated.

I checked Langdon's site and the split header is out of stock. Surprising! Give him a call, though, as that's what you really want.

From there get an Offy intake: https://www.summitracing.com/parts/ofy-5...ASABEgJiJPD_BwE

(you can find them anywhere. Try Ebay as well)

A Holley 390 CFM 4 bbl: http://www.jegs.com/i/Holley/510/0-8007/...AyABEgIrc_D_BwE

OR

http://fitechefi.com/

Then add in a cam, HEI, and exhaust system.

Odd that I can't find a Langdon header anywhere right now.

She'll wake right up then. About 200-225hp, 225-250 ft-lbs. Add in the right gearing and trans and she'll move along just fine. My old 68 Camaro could run circles around my buddy's 100% stock 68 327 2bbl car.


Yes, mine is the non integrated head, I think that started in 75?

I seen folks using Langdons, and thought they looked nice, and a little sturdy. I see now that 12bolt has them. He might have bought their stock up from them.

I didn't know Summit sold stuff for the 250, as in high performance stuff.

Would the 4 barrel be too much for my 250, without having to rejet it? I have only taken one barrels apart. And for a cam, I have done V8's, but never messed with one of these. I'm going to have to do some reading. It's very easy to get to everything on here, which is nice, but I am lost with the cam.

WOW! You were running around a 327, thats actually impressive! I was told by a friend that these 250's can take a beaten and keep going. Supposed to have a strong bottom end. I don't beat my car, but occasionally like to step in it a little.

I would be thrilled with 200hp! I seen that CLifford performance kit, and didn't know if they were any good. It is a 2 barrel though.


Holley makes a 390 CFM 4 bbl that is just about perfect for the 250. Almost everyone on here has or is running one.

A 2bbl 327 isn't all that fast especially with a powerglide so it's not a huge accomplishment...

As to the cam: several companies make them. The hard part is changing one. First off they're rediculously long so you have to figure out how you're going to pull it out. I had to jack up the front of my engine, remove the grill and radiator and pull it out the front of the car. Then you have to get a new cam gear, heat it up, and slide it on. Then there's the retainer and finding those screws through the existing cam gear. While you're doing that you'll want to get new lifters, springs and valve seals... it snowballs real quick. Mine lead to way more than I had planned!

The L6 is so stout because it has 7 mains and is naturally balanced. You get it running right and even with a heavy cam it'll bare move at idle. They're just darn smooth.

Saw a video of someone who removed all the oil from one of these and ran it at WOT until it blew. Lasted about 15 minutes from what I recall. I don't know of any other engine that can do that.


As for Clifford: my humble opinion is overpriced.

Last edited by gbauer; 10/18/17 12:29 PM.