477 bbc

Any thoughts on running a 477 ci bbc 4.50x3.75 combo? pros cons what rod length would be suggested with a tall deck block? any info would be appreciated.
Thanks

 

Tallest rod you can fit in there. Makes the piston lighter, and less side loading for cylinder wear. Unless you are going for a more "Off the shelf" deal. then go with the tallest of the standard. Like a 6.800. Is this an all out deal? steel rods? what application?
But why a tall deck?

I love the 3.7 series cranks in a big bore deal. Putting together one right now.

 

I wouldnt use the longest rod.I had 6.8 rods and you end up with no skirt for stability of the piston.JMO.

 

I am just looking at some options on building my first blown alky motor i have a few parts lying around and a few different options to build have the chance at a good billet crank that will fit my chev block and has the 2.375 rod journal which i can use my 6.535 length rod ( have a set of brooks 65 rods with those specs)i have a tall deck block also have the option of a 572 or 540 with steel rods just not 100% sure which direction to go, i am building a door car and it will weigh 2700 with me in it and i am trying to get a 7.50 to 7.70 et figure i need to build close to a 1500 hp motor but plan on running conservative to i can have a low maintenance motor
Thanks

 

Go for the 477

Hi ! We have run one of those combinations for a couple of years. Bowtie 4.500 bore tall deck block with GM steel 3.76 crank, Brodix solid heads and just a 8:71 roots that made 27 lbs of boost. Worked great. 6.98 in 2150 lbs dragster. Good revving motor and no problems with the Brooks 6.385 and Ross 11.3 to one pistons. The stress on your main caps will be the limiting factor of that combo. We later built an all billet 397 CID CN block, Alan Johnson heads, Kobelco K9 that runs 6.62. There is of course a difference when it comes to maintenance. If you can afford high end components it will be cheaper in the long run. We still keep our 477 in spare. Good luck. Have fun.

 

With the weight you are trying to drag down the track, the 477 will do it. But it will need more rpm and to be pushed harder than the 540/572 option. The larger stroke will make a wider torque curve, and make more hair down low. That will keep you out of replacing valvetrain parts as often, and less maintenance.