Am working on putting together a 427, looking at the Dart Iron Eagle SBC tall deck. Can't get the rod ratio into the 1.8's.
Using a compression height of 1.25 to keep the pin out of the oil ring

The most cubes I come up with is 380-4.155x3.500, deck at 9.320, 6.270 rods, rod ratio of 1.63, compression height of 1.25, stroke ratio of 1.19

Is there a way to make this work?

It works out better with a BBC but want to use many of the SBC parts I have  

rod ratio is not as important as some people mite think.an old friend of mine named warren johnson once said the rod is just something that connects the crank to the piston.he has done mucho testing in this area and not that important.unless you plan on 9000 rpm and above.  

I agree with Prostock that rod length is overrated,I would put the longest rod that would practically fit without having to put your piston rings on over top of your wristpin.
Maybe I missed something but if you want 427 ci. why are you using a 3.5" crankshaft?I did not do the math but I think you are going to need at least a 3.875" stroke to get those cubes(4.125x4.000=427ci.)
               4.155x3.875=421ci.
               4.155x4.000=434ci.
 Ok so I did do the math  

I will agree with what has been said about the rod ratio also. But to get your SBC 427 the formula to figure out the displacement is bore x bore x stroke x .7854 x # of cylinders. Therefore to get your SBC 427 you need a 4.125 inch bore x 4.00 inch stroke x .7854 x 8 and that will give you the total cubic inch displacement of 427.6503 cubic inches.
I also have plans to build me a SBC 427 and I know that if i have any questions i can always look at what Bill Mitchell is doing. You can find his web site at www.theengineshop.com. He also has information on how to make a SBC 454 as well.  

Rod/stroke ratio not that important? That's a new one to me!  

OK, I did some more homework:
 The 348, 409, 327 and early Camero 301 were very powerful engines for their displacement. They had rod ratios of 1.89, 1.71, 1.75, respectively, don't know the 301. Their bore/stroke ratios were also high at 1.27, 1.23 and 1.19.
 Today if we want more power we just go to a BBC and add cubes, back then they were trying to get more out of the SBC.
 In Crower's displacement chart one of the highlighted sizes, used for racing, is the 377: rod ratio of 1.72 and bore ratio of 1.19.
 Look at the Mark IV and later blocks and their rod ratios are much lower at 1.53
 Looking at the racing 427 engine developed by Dick Keinath in the early 60's with the canted valves or porcupine heads. It did so well at Daytona in '62 that NASCAR forced GM to sell two of them to Ford. This was the basis for the IV and later BBC heads. Dick's 427 had a rod ratio of 1.68 and a bore ratio of 1.18.
 I read that racing engine builders like to keep the rod ratio's between 1.80 and 1.85. They were using the term for acceleration engines.
 I talked to Dema Elgin, a good cam designer and builder in northern California about the SBC I wanted to build and right off the bat he said: 1) use a block with the raised cam bore, taller deck, BBC diameter cam bore rather than the SBC, get the rod ratio as close to 2.00 as possible and keep the pin out of the oil ring. This lead me to the Dart Iron Eagle.
 But the max cubes with the Iron Eagle with this criteria is 383 -  9.330 deck, -0.005 off to flatten the deck, -0.020 in the hole, -1.25 compression height, -3.480 stroke/2 = 6.315 rod, use a 6.300. This has a 1.20 bore ratio and a 1.8 rod ratio, bore of 4.185, stroke of 3.48. Cubes = 6.283x4.185x4.185x3.48 - 383. Can get a 383 out of a Dart Little M but with lower rod and bore ratios
 To get a 427 in a BBC this way,  

Please see by 2/17 reply  

I did research on building a sbc 427 and ended up buying a bill mitchel craqte moter for a little over 9g
w/539 hp. I have it in a 84 monte and couldn't be happier. the only problem I've run into is finding headers. I ended up using super comps that go over the frame w/ one tube on each side. If anyone knows of a better header I would gleefully switch.  

hey um im new to this website so really dont kno how to work it but i have a question about my car i have a 1974 elcamino wit a 350 motor and like it hasnt been craked in a year well till bout to months ago but  i crancked up it several times and like it has gas jus changed the spark plugs and alot of other stuff but when its cranked every time i push the gas it tries to die out and when it dose i crank it back up agian and the same thing happens do u think u could help me wit that or do u kno ne one who could help me  

have you tried to drain out the fuel from the tank first, cause if a car is settin for several years water builds up in the fuel tank and thats what the fuel pump is suckin up instead of pure gas. you maybe able to get some water displacer from the local parts store to just add into the gas tank.  

just a thought, but can ya use the block hugger style headers?  

Have you tried Doug's Headers?  

That 9 grand is probably less than what it would cost me to do it myself, I had numbers running up to 12 grand using a Dart Little M for a 427. How did the motor mounts line up on yours?

I have a 327 in a 68 Malibu and put in a manual tranny. The Headman's that were in there conflicted with the clutch linkage so I ended up swapping out them for Doug's long tube. Worked great but had to raise the car for clearance.