445 Engine Build

[Pimpdady753]

ok so was reading a muscle mustangs and fast fords mag the other day. They did a 445 build with a Man O War block 9.5 inch block, they bored it out to 4.155 and stuffed it with a 4.1 stroke crankshaft and a 6.2 Rods with dished pistons. My question is how practicl is this set up, ive herd about the 427s not lasting long due to the long stroke, what do u guys think about this. They put some TFS track heat heads with 70cc chambers, and a supercharger and they pushed 1,045hp at 6,000 rpm on pump gas. Thanks again.

[351wStang]

Well it is true that the "side loading" from the extra stroke will cause more wear. But if you want big power on pump gas then big cubes and a little boost are probably the most common way. Most pump gas windsor guy's I've seen or talked to keep it around 410ci for the cheaper cost. However the extra 35 cubes would help. I know when I had my the S-trim on my 357" motor that my base dyno pull was 517rwhp. I talked to a guy with a 347" motor that had the same heads, cam, blower & boost and his base tune pull make about 490rwhp. The only difference in these motors was his heads where 1.90 valve Perf RPM's & mine where 2.02 valve Perf RPM's. I had a blow thrue carb with the Air-Gap intake & he had the RPM2 EFI intake. Also he turned his motor to around 6400rpms to make the 490 where I shut mine down at 5700 to make 517. So, this just goes to show that 10 ci does help, 700rpm less and .12" intake valve dia. more I made 27rwhp more than he did.
Now, the weather, the dyno, ect, ect, will all make a difference. No we didnt dyno on the same day and no we didnt use the same dyno, but you still get the idea.

[SkylineUSA]

I see da Pimp is at it again

Not good for road use But it does work.

Don't compare dyno numbers, they mean nothing

[351wStang]

Originally Posted by SkylineUSA

Don't compare dyno numbers, they mean nothing

ya ya I hear ya Tony. My car was 9 sec capable at that time, where the guy with the 347 was in the 10.20 range. I know I never got my car down the track, but it went straight and hard on the road, I'm sure it would have been even better on the track.

[Pimpdady753]

like how many miles do these thing last usally. Does any one know, like a guesstement.

[SkylineUSA]

Originally Posted by Pimpdady753

like how many miles do these thing last usally. Does any one know, like a guesstement.

Not a fair question.

Depends on how its driven, could last a few thousand, to 30,000, a complete WAG of course.

I could not see it lasting more that 40k

[351wStang]

I have no real answer for this question. Most of the guys I know of with big inch windsors are making a ton of power, they pull their motors apart to check things out and freshen them up during the winter months. But, I never hear of any wear on the Dart blocks they use.

[SkylineUSA]

Ya, but how many miles are they putting on their cars? Most cars built like that really do not see more than a few thousand a year.

[351wStang]

True.

[Pimpdady753]

they also were saying that with boost u lighten up the side load, so the engine will last longer. Any one here any thing about that, or is that bull crap.

[SkylineUSA]

Who said? Where is that posted?

IMO that does not make sense, how could that be true.

[351wStang]

The only way I see that being partially true is with big power. Say you have a 427w N/A - 850hp, Well it will need a rebuild sooner than a boosted 1000hp 427w, IMO. That is of course if you compare apples to apples, similar built motors, both with the same style valve train and same quality parts, as well as rpm range and oil used ect ect.

[Pimpdady753]

yeah that is what they were saying with the 445 they built that was supercharged and made 1050 hp