guys

I just picked up a 360? motor for $50.00 It ran well but I want to rebuild it. Degreasing it, I noticed a backwards 105 where the standard 352 is usually located. What does this mean if anything?

regards
ben

 

You proably have an FT block. Look for the re-enforced webs on the main journals. Check the stroke, my be you will find a suprise and have a 390 instead.

 

Ben, it means you have a little stouter block than the other. Sorry but I wouldn't count on it being a 390, those blocks were used for the 360 as well. You got a deal on the engine though. Find a 390 crank to piston set and you can have a 390 very easily, as it is the same bore size.
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John

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In the cool still quiet of night, you can hear chevies rusting away.

 

John
what I would like to do, is build a 410 out of this block. I never really 'Built' an engine before and I was tossing around the idea. Ive seen folks here mention the reverse 105 casting before noting that it is 'beefier'? That is why I jumped on it when I saw it for sale. How hard or in detail is it to build up a 410? In terms of torque and HP, how does the 410 fare vs the 360 and 390??

regards

ben

 

Ben, Same suggestion as last, but this time you gotta start with a $500.00 428 crank. The 410 is one hell of a truck motor, but I don't think it's that much difference. $300/350.00 more in the crank alone, for 20 more cubes.
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John

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In the cool still quiet of night, you can hear chevies rusting away.

 

 

Aw, John, it's not that bad. A 390 crank will run about $75-150. A 410/428 crank runs about $200-300, so only $125-150 or so more. For that extra money, you get more than just 20 extra cubes -- you get the torque multiplication that comes from a longer crank arm. There's a reason that drag racers in cube-limited classes debore and stroke an engine -- it results in much better torque!

In all fairness, though, I do believe that a 410 is more difficult to build. The longer stroke and additional cubes make it difficult to keep the compression ratio down in "pump gas" range without extensive head work and/or dished pistons (though a slightly longer duration cam will help). Also, you need to consider the (minor) expense of a counterbalanced flexplate for the externally balanced 410 -- figure $55-75 for one.

All told, I think that starting with a good 105 block, you could build a 410 for only $250-400 more than a 390 would cost you. To me, it's money well spent. Of course, I already did it.

The other possibility, of course, is to bore that block to .080 over -- then, in combination with a 410/428 crankshaft, you'd have a legitimate 428.

 

Karl, How many good 428 cranks can you ship me by the end of the week for $200.00? Most of the ones that I see are in the $500.00 range. I'd like 2 or 3. Some guys have all of the breaks.
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John

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In the cool still quiet of night, you can hear chevies rusting away.