hmmm, never seen 1 for the 300, or a 240 at that. Seen em for the small sixes, never the bigs. That would be ausome. K so forged stock pistons, or as close as I can get hehe. Find me a crossflow head with a bit of port and polish work and get a nice high RPM cam. Suitable intake and exhaust could push 300 HP easy. And with all the forgings, I could prolly get away with a 100 shot, got my 400 HP, TQ would be high in the RPMs, but HIGH in the FT LBs too, and i could keep an almost stock gas mileage, and then in the light @$$ car, would probably increase hehe. Ausome. a 20 MPG monster, throw maybe some 4.1s in the rear, behind a nice tranny, and 0-60 could be in the 6s easy (beats my 12 as is) lol.

 

20mpgs?? hell no! not in a 300, especially a high performence application. Horsepower=gas. Not in all situations, but you can only "free" up so much h.p. Col's 300 hp 300 gets 15mpg on the highway. This would be the same, not including the laughing gas.

 

Yeah, but he's not talking about a truck application. I'm guessing falcon, mustang, or maverick.

 

Still thinking that kinda mileage may be difficult to achieve, unless a T56 was used along with a reasonable rear gear ratio....ya know...turbos sure like high gearing (numerically low)...which is good for mpg.

Still not sure about the crossflow head on the other website, personally, I don't think its worth the money to build an intake/headers for it or the initial cost...but thats my two cents.

 

You don't need custom intakes and headers for a hybird cross flow head if you use Ford heads to start with. The bore spading on the SBF is the same as the 300, so the ports are the same distance apart. All you really need is a piece of 3" aluminum 1" thick and long enough to cover all the ports. Port match one side of the aluminum to the head and the other to the manifold. Drill and countersink the bolt pattern for the head on the adaptor so it can be bolted to the head, then have a second bolt pattern for the manifold to bolt to.

 

Sounds like a plan but unless I have lost my noodle, your gonna have to modify the two additional runners on the header side, the first 4 to one header may bolt right up, then you have the other two runners to consider...starting to sound custom to me.

 

You use the manifolds for the 300 dork.

 

?????????

 

The tubes on the EFI lower are pretty big. They could always be extrude honed for more flow.

 

Suprisingly, I agree, the efi runners could be extrude hone...then you have to weigh cost, last I checked, that wasn't cheap.

 

It's cheaper than a custom intake. I have doubts about a big tube header being much good on the 300. IIRC, the Hedman's are 1.625. The port area on a lot of heads isn't enough to fill that up, but there are also lots of SBFs built with 1.75 or larger tubes. Those are meant to run at higher rpm though. I think you would lose less top end with a pipe just a tad small than you would lose low end with a pipe too big. I'll take more 10% more low end and throttle response over 10% more top end any day of the week, but that's a personal preference.

 

But is it cheaper than a carb intake~carb....

I could see where you'd think that...sounds reasonable to me.

 

Yes. I think a carb and intake would be about $400. I don't think it would be over $200 to get it extrude honed, but I haven't had any of that done in a few years.

 

Wow, this post is alive, ausome. As for gas mileage, I just managed to get 18 in my truch, babying it yes, but with the mazda 5 spd, and 3.5s LS in the rear, on a flareside 4X4, i didnt think that was half bad. God 2 massive cone filters sitting on my intake tubes instead of the air box, and an electric fan that I never have to use instead of that dam 1 on the clutch, old school flowmaster 40 (non delta series) 3 in in, 2 something a bit smaller(lol) outs. But the motor that would be going in, would prolly develop round 14-15 with the cam if i can keep out of the gas, in my truck that weighs at least 4200-4600 pounds, the car should way no more 2300 all said and done. Remember that the only performance parts that will hurt the gas mileage all the time will be the cam, the head and headers should only hurt it when i get on it, as would the intake, but Ill be able to run mass air if id like, and take a lil leap over speed density (unless I do whats described below) and then or course nitrous, which only hurts when I use it. T56 is the preferable tranny, because I know it can handle the power, and be warrenteed to do so, and its a dam 6spd, who doesnt want 1 of those. Also fairly customizable because the shifter can be moved back and forth and tilted side to side to get that perfect fit. Its actaully a 4spd OD with OD, with an available .6 6th gear. I thought about it and i think I wont go higher than 3.5 rear end, 1 because I wont need any more torque getting to the wheels, 2 because it will help with gas mileage if it stays lower, and make the gears even more fun. I wonder if I could get basically a tripple webber intake to bolt up to my stock EFI lower. I can get throttle bodies that look like webber 48s (but house fuel injecots, pretty sweet i think) for 750-1000, and that would be a sick lookin intake, and Id get fuel injection.

Last thing, when given then option of 10 % low end in the place of 10% high end, I DONT NEED ANY MORE LOW END haha, it will be hard enough for me to keep the wheels connected to the road.

 

Jeez..the price musta really came down, they quoted me $500 for something simillar...of course that was a long time ago.

$200 extrude hone lower
$??? custom plenum box
$??? carb/efi tb's?
$??? chip

or

$400
carb + intake



Perspecitve is a ****...just messing around Silver streak.

Only thing limiting you is your cash flow or fabrication skills.

Actually, at on point in time, I thought about replacing the stock efi TB with a weber carb...now that would be different but then I thought, why? I was also thinking mild stock, unlike yourself.

Theres a guy that races the ford 300 and he made a comment once, that multiple carbs were overkill and didn't make as much of a postive difference in a race situation as one might expect, when compared to a single 4bbl. FWIW