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Author Topic:   OK Ford guru's
KK17
Dirt Freak

Total posts: 229
posted August 16, 2005 07:04 PM  
is it possible to build a 550 horse 347? I've read literature on the 347's and have seen 400 horse on a claimer motor, but I need more than that...anyone care to share some advice? will give specifics if anyone is interested..thanks Erik

Jeep83
Dirt Roller

Total posts: 9
posted August 16, 2005 07:50 PM  
Sure! I have a 720hp 347 in my garage.

ispin
Dirt Full Roller

Total posts: 48
posted August 17, 2005 06:28 AM  
600 is possible with cast heads!

tg
Dirt Roller

Total posts: 16
posted August 17, 2005 11:15 AM  
Are you guys running stock blocks?

Mell00
Dirt Forum Racer

Total posts: 88
posted August 17, 2005 12:50 PM  
nope

midmod34
Dirt Maniac

Total posts: 119
posted August 17, 2005 03:55 PM  
DART

midmod34
Dirt Maniac

Total posts: 119
posted August 17, 2005 03:56 PM  
620 in a latemodel with spec heads actally we are at about 352 ci in a 302 block

KK17
Dirt Freak

Total posts: 229
posted August 17, 2005 04:45 PM  
sorry for the lack of info on original post, but I was being rushed..anyways this is for a WISSOTA mod and I can run roller rockers and cam..can you do this in a stock block? by the looks of it NO? any suggestions on components and where to buy them..what kind of money are we talking? thanks Erik

Jeep83
Dirt Roller

Total posts: 9
posted August 17, 2005 08:03 PM  
You can run a stock block but keep the compression at a moderate level and the rpm below 8000. I have never run a stock block but have heard stories from the modified guys that run them. Ford SVO does sell a "sportsman" block but I do not know the price of them. Check out RDI in Cornielius NC (Race Part Distribution Inc)(704) 892-8688 . They are all things race when it come to SVO. I think John is the guy you want to talk to.

mike9
Dirt Full Roller

Total posts: 72
posted August 18, 2005 07:43 AM  
if you run a stock block you need a main cap girdle to stabilize the bottom end , the ford svo catalogue says a stock block is good for 500 plus horsepower

HEAVY DUTY
Dirt Full Roller

Total posts: 36
posted August 18, 2005 08:21 PM  
an old stock block, like a 69 or 70 is pretty good.i have gotten a season with 520 hp.i have broken a couple sportsman 302 blocks.i think the old blocks are better.if you have the money a r302 or a dart block is the way to go for reliability, but will add about 35 lbs.stay away from the hyd roller blocks,they will break in just a few race nights at 7500 rpm.

oldfordmod
Dirt Full Roller

Total posts: 46
posted August 25, 2005 03:47 PM  
Heavy Duty, What broke with the sportsman block? I have one that I am ready to put in, I thought that the thicker main webs would take the pounding, now you've got me worried.

ispin
Dirt Full Roller

Total posts: 48
posted August 26, 2005 02:11 PM  
I broke the main cap of #2 with 13:1 copmression in a windsor block. Talked to some people and 11.5:1 is about as high as you want to go on stock blocks. My block was a 74 year.

49mtmod
Dirt Maniac

Total posts: 127
posted August 28, 2005 05:58 PM  
I have a friend who runs this ford combination in a wissota mod so I asked him about this question. I don't know what his h.p. numbers are but there aren't many cars who can out power him. He said he runs a stock block and turns it 8000+ plus. Just like mike9 said, he told me the key was a main cap girdle.

HEAVY DUTY
Dirt Full Roller

Total posts: 36
posted August 28, 2005 09:02 PM  
i think the iron is soft, it has a more porous, coarser looking grain than the old stock blocks. the ford catalog said they were good for 600 hp est. when they first came out,but now the catalog says 450 hp.both of the blocks i broke were without main girdles and had a lot of cap walk,and broke thru the main webbing and/or the main bolt holes.they lasted probably 20 nights at 7500 rpm, but so do the old 302 blocks.if you arent getting claimed, the rblock will last for a long time.my main engone is an r block that we have ran and freshened since 2000.we are up to a 4.145 bore. it is about 30 lbs heavier though

J3
Dirt Maniac

Total posts: 188
posted August 29, 2005 01:52 AM  
What is a "R" block? Where can I get them and how much do they cost?

HEAVY DUTY
Dirt Full Roller

Total posts: 36
posted August 29, 2005 08:35 PM  
the r block is ford motorsports race 302 block. i think they are about $1900 plus machine work. you have to get them from a ford motorsport dealer.they can be bored up to 4.185 i think.dart and world products also make big bore 302 blocks that are strong

akadirtracer7
Dirt Freak

Total posts: 217
posted August 30, 2005 06:16 AM  
Go with the dart my buddy has had problems with the r blocks.Also supposed to be less machining.I ran a 70 block 347 in a factory stock 4 yrs. cranking it 7200 no girdle and its sitting in the garage ready as a spare should the 408 take a dump.Thats another story. 74 stock 351 block that I was told wouldn't last a season as a 408 is just about finished this season, only problem it blew a head gasket 6 races in. Figured the cause and cured it.

oldfordmod
Dirt Full Roller

Total posts: 46
posted August 30, 2005 09:01 PM  
AK- what do you turn your 408? Does it have the 3" mains? thanks

duke
Dirt Roller

Total posts: 17
posted September 07, 2005 08:28 PM  
I have had good luck with my 347 in an 89 roller block with a steel girdle (7000-7600rpm). About 30 nights since it was last freshened. About a total of 60 nights on this block, crank, and rods. Had to repalce a piston but thats another story. Also this is in a modified and we usually don't "lug" the motor.

I'm also interested in how hard you can turn the 3in main windsor strokers?!!! got a 410 I am putting together!

akadirtracer7
Dirt Freak

Total posts: 217
posted September 08, 2005 11:39 AM  
I run it 6600-6800 from what I hear it will start to give you problems once you get in the 7000 plus range.My buddy is running a 418 stock block and runs it around 7000 it has about 25 races on it this year and no problems.

oldfordmod
Dirt Full Roller

Total posts: 46
posted September 09, 2005 12:12 PM  
Are you and/or anyone running a stock tyoe oil pump in the pan with a stock 351 windsor block? My windsor's have always killed the rod bearings (#2 0r #7) long before the block failed. I now run an external single stage pump with about 75 lbs pressure hot at 7200 RPM. That cured the oiling problem with the Gerotor type pump. Does anyone else have this type of problem? If I tried to run 7800 or more, the bearings wouldn't last 1 race night. I ran .0025 on the rods and anywhere from .002 to .003 plus on the mains without success. Any comments would be appreciated.

mike9
Dirt Full Roller

Total posts: 72
posted September 09, 2005 04:29 PM  
i think the clearances were too loose stock pump couldnt keep up with the leakage

tcmod
Dirt Full Roller

Total posts: 56
posted September 26, 2005 08:00 PM  
I run a high volume pump in the pan of my Windsor, typical pump, no problems. 393 stroker on alcohol in a mod, 12.3 to 1 comp., turn it 6400 to 6800 rpm, stock 71 block, dart heads, no main girdle yet, got one on the shelf, may put it in this winter, for a cheap first motor this thing is fun. In wissota country.
If you are running mech cam just restrict oil to the top end with the simple restricter set, and let her buck. It's easy to make big power with the Ford's.

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