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Old 03-20-2010, 03:54 PM   #1
Wheelin MadMan
 
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more tall deck questions

still new to this thing so i wanted to get some input with experiance. what combos can i run in this thing as far as rods,crank,piston go? i wanna have something along the lines of a stroker motor. never had experience with doing so in a bbc. the block is punched .60 over if that helps anything?
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Old 03-20-2010, 05:37 PM   #2
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I'm not all knowing. But, just wanted to know more info on the Block 396/427/454/502???
I think the crank has alot to do with stroking a engine...well that along with head/valve clearance....cam shaft.
I guess their are many variables. Big Crank, small connecting rods, the location of the risk pins, flot top piston, dome piston. Smaller Crank, longer connection Rods.
Clearance of the Connecting Rod off the Crank to the sleeves.....same with the bottom of the Pistion.
and what is your Goal?

In my Mouse days. I (had built) stroked a 350 SBC 4bolt main to a 383. Of course that was my Goal. Sense, I was in the Navy at the time. My Older Brother did all the leg work Locating a 350 4bolt main, 400 SBC crank, Harmonic balancer, Fly wheel, SBC Camo Hump heads. I dont recall the Machine shop that did the work. But, I had everything done their and went with the Machinist recommendations as far as what cam to use and carb set up.
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Old 03-21-2010, 10:48 AM   #3
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i built a 383 the exact same way, i am not sure what i wanna do really i wanna build a long stroke torque monster. i found this kit from speed-o-omotive check it out, its 13 bones but it comes with crank,rods,pistons,bearings. everything needed to stroke a 427td to a 478 with standard bore.
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Old 03-23-2010, 06:21 AM   #4
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The tall deck 427 IS a long stroke torque monster. They put them in dump trucks and school busses. I wouldn't do a whole lot to it since it's already .060 over. I'd keep the compression in the 87 octane range, since fuel cost with a BB is going to be a budget item.
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Old 03-23-2010, 07:35 AM   #5
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the tall deck blocks are the perfect foundation for a stroker motor, so i have been told, this is one of the main reasons i got the tall deck, it has its ups and downs but mostley worth it. if you can get your hands on a marine block they have thicker blocker so can handle alot more abuse. i am ordering the forged stroker kit from speed-o-motive in a couple weeks you outta check it out it comes with everything you need to stroke your motor all you need to do is clearance the block.
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Old 03-23-2010, 10:37 AM   #6
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Originally Posted by 95YJman View Post
The tall deck 427 IS a long stroke torque monster.
If you consider 3.766 a long stroke. But then, some guys inches are differnt than other guys.

A 454 crank (4.000 stroke) will fit in a TD with no problems.
A 496 crank (4.250 stroke) will fit with a little machine work.

Anything past that, and it reguires extensive work to fit (lightweight pistons, and rods with thinner beams, and a small base circle cam) The camshaft is what limits the stroke, there isn't much distance between the cam and crank. This is where a BBF is superior, you can build a 545 BBF and not hit the camshaft.

There is no "marine" specific TD block, they are all the same, truck or industrial. The older (70's models) could potentially be thicker, but corrosion in the water jacket, over the past 40 years, could have thinned down the walls. A good TD block has the potential to go .100 over, and if you're brave .125 over. The bottom line is to get it sonic checked, running an engine on water only (not coolant) for 30 years can cause a LOT of pitting in the water jacket.

As far as rods, 6.535 and 6.6600 are the most common for stroker TDs. These 2 rod lengths allow you to use "off-the-shelf" pistons. The stock rod is 6.135, just like any other BBC.

You should also pay to have you kit balanced at a LOCAL machine shop. I have heard when the kits are sold pre-balanced they do sloppy work and can still be off quite a bit. But I wouldn't know.
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Old 03-29-2010, 07:20 PM   #7
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this is the new setup i have ordered so far, 4.250 crank, 6.535 rods, now i havent got around to pistons yet but will just some ol 454 work for me? my block is 60 over so of course some 60 over 454 pistons would be in order. and of course i will be having my machinest balance this stuff. i trusted a crate motor once before and that was a joke i will never make the mistake of unwrapping and installing again. oh well lesson learned. has anyone here ever done this before? just curious of what my numbers are gonna be after its all said and done.
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Old 04-01-2010, 10:49 AM   #8
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No, regular ol 454 slugs won't work. It's a Stroker now so you need "496" pistons.

"Standard deck and stock rod length, with a 4.250 stroke" would be the correct way to put it.

Speed Pro Hyper #H552CP, 9.25 to1 compression.
KB Hyper #KB397, 10 to 1 comp.

Those are about the cheapest, at $325 a set. Going with forged slugs will start at $600 and up.

Horspower ratings are a crap shoot. The only way to tell is on a dyno.
There are too many other factors to consider besides "the bore and stroke."
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Old 04-02-2010, 12:51 PM   #9
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oh hell thanks bud i thought i was about to have to do some serious searching. i will order these next week and get'er goin.
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