Mileage is a function of the driver, rear axle ratio, transmission,camshaft selection Etc.

I would not expect the relatively minor increase in displacement to affect it much.

The added effeciency of the Mummert combustion chamber design will more than offset anticipated losses in the added displacement area.

My days of having ported or doing some myself on iron heads is over..................... compared to the cost of aluminum heads in stock condition. From what I've seen stock aluminum heads will easily outperform even race ported iron heads and not give up anything on the bottom end. The aluminum ones are cheaper for the performance be it small or huge from what I've experienced and seen on the dyno. Teds working on an article on my engine and should be coming out soon and the aluminum really works!!!!

-Gary Burnette-

That quote was from one of the well known Y block guys here on the board. So I would definitely trust him with 'em. We didn't discuss how in-depth the port was but we were talking a good bit about porting so I think he knew what I was after. The only thing I forgot about would be the added cost of shipping them to him. Probably be about $250 round trip so that would knock my savings to about $1150 but still not a drop in the bucket.

Brad
Odenville, AL

1955 Fairlane Victoria
1956 Ford F100 (Restoration Underway....slowly )
2006 F150 SuperCrew

I heard that all of the above would result in worse mileage. I really think that the biggest player is the compression increase. Most Ys are actually 8:1 or lower, forget what they advertise, so when you actually give it compression it has a significant effect on power and efficiency.

For $700 make sure you're getting what you expect. Find out exactly what stage 1 means. Around here, that's simply the cost to rebuild the heads. Porting, depending on who does it can be anywhere between another $1000 and $3000. So in my area you're looking at about $1700 at least for an assembled, ported ready to run set of heads, and that's if you let the cheap guy do it. That's not for maximum performance but it will provide a significant boost.


Lawrenceville, GA

As far as the head porting....I got a quote from a Y block guy for $700 bucks including new stainless valves, new HP springs, hard Ex seats and stage 1 street port job. And I only paid $100 for the heads. So at $800 bucks it'll save me $1400(compared to aluminum)....that's why I'm leaning heavily that direction. That $1400 will almost pay for the stroker kit.

I never assumed that you would gain mileage with stroke. I thought opening up the heads and good headers probably would but not stroke. That's very interesting.

Yeah, I've been considering the 312 crank/rods route also. Decisions, decisions. Keep the suggestions coming guys!

Brad
Odenville, AL

1955 Fairlane Victoria
1956 Ford F100 (Restoration Underway....slowly )
2006 F150 SuperCrew

A 312 crank, rods, and .40 over pistons will get you 318 cubes without breaking the bank. As stated earlier here, mildly ported steel heads and a Mummert intake and large holley, and a good cam should get you 325 to 350 horses and save the $2200 for the aluminum heads. Of course when you add in a rebuild and port work on the steel heads that cuts the savings. Adding $$ adds horsepower.

For what it's worth, my mileage went up after stroking and porting and boring. I was pleasantly surprised. The compression increase probably did most of it but it has a lot to do with the way you drive. People who know about my type of truck would think it still has a 223 based on how "fast" I drive it - the sound gives it away, though. At about 350hp, you will be closer to hotrod territory but light duty truck stuff should be no problem if so desired.

If you're planning to pay to have your 113s ported, seriously consider aluminum heads. The cost will probably be just about the same.



If I were to choose between buying the parts to stroke or buy aluminum heads, I'd choose to stroke because you can't really hurt anything with more displacement and you get an automatic compression increase which all stock Ys can use. With the aluminum heads you will get a compression increase but it's not as effective as it may seem at first. That increase is to account for the heat loss due to the different metal, aluminum vs iron. If the heads are mismatched, you can loose a lot where you want it and heads are far easier to add later.


Lawrenceville, GA

Thanks Glen and Gary....that's what I'm looking for....advice from guys here on combo ideas to keep me on the straight and narrow. You've been there before with these things and I haven't....so I'm leaning heavily on your expertise. 

Glen, I meant to call you and never did. I'll get on the horn with you in a day or so and mull some of this over if you have the time.

Brad
Odenville, AL

1955 Fairlane Victoria
1956 Ford F100 (Restoration Underway....slowly )
2006 F150 SuperCrew

Brad, everything said is true but I wouldn't discount the other either. In keeping everything stock in the shortblock with the exception of shotpeening the rods and using arps rod and main bolts the new aluminum heads and mummert intake without any extra work, I believe will put the engine way above 300+ horses and a excellent torque curve with the right cam. Ted already talked about this was like adding a supercharger without actually adding one. I think a cam in the neighborhood of .234 @ .050 with a running duration of 264 lobe sep around 110 ( this is a tight lash series Comp cam ) you should be in the best of both worlds of lots of real power and decent gas mileage as well.

-Gary Burnette-

Brad, I have got to agree with the above comments. Let me through a combo at you and see what you think.

Mummert .060 forged pistons

Mummert stock length rods

cam of your choice (with advice from cam grinder)

ECZ B intake with port matching and opening up the base to match modern holly carb

reworked stock dizzy

a good professional street port job on the 113"s

a good set of headers and exhaust

a few hours with a good tuner on a dyno

the above combo will yeild 301 ci and will yield 300 plus hp

then invest the extra money in either a AOD or T5

with this setup you have power and fuel economy in an affordable package, may even have some left over for dress up items.

Glen Henderson



Freedom is not Free

Letohatchee, AL