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Old 01-14-2011, 10:03 AM
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Prepping a 400 Block

I am getting my 509 sbc 400 block ready for the machine shop. I have tapped all the holes and ground out the oil return holes, whatelse should i do to it? This is going to be a street engine with 11:1 compression with sportsman II and possibly a hydaulic roller cam forged pistons and steel crank. Do i need to plug any holes in the deck or add any block filler...i haven't ever done either one.

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Old 01-14-2011, 10:11 AM
How fast is fast enough?
 
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Quote:
Originally Posted by hobby28
I am getting my 509 sbc 400 block ready for the machine shop. I have tapped all the holes and ground out the oil return holes, whatelse should i do to it? This is going to be a street engine with 11:1 compression with sportsman II and possibly a hydaulic roller cam forged pistons and steel crank. Do i need to plug any holes in the deck or add any block filler...i haven't ever done either one.
While its not necessary if you want more durability you can plug the deck and do a partial fill on the block. You don't plug the deck completely though, you need to tap the holes, put the proper fittings in with the holes drilled through them. You also can't fill the block completely if its a street engine and you don't want to get fancy on cooling. I'd consider a partial fill though as a lot of those 400 blocks have thing cylinders.
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Old 01-14-2011, 10:21 AM
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What stroke and rod length your running has an effect on how far to fill the block too. if your running a 3.48 stroke making a 377 with a long rod there will be alot less side loading than if your keeping the stock 3.75 stroke and 5.565 length rods and trying to hit high rpm. RPM also playes a factor in how far your going, higher than 6500-6700 and i would look at splayed and billet mains. I like them as a precaution on any oem block seeing over 500hp.
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Old 01-14-2011, 10:39 AM
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I am using 3.75 stroke with 5.7 i-beam rods adn mahle forged pistons.
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Old 01-14-2011, 10:41 AM
How fast is fast enough?
 
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you're not shooting for over 500hp are you?
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Old 01-14-2011, 11:21 AM
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I am looking to be above 400...nothing fancy here just 200 cc runners on heads and probably a performer rpm intake due to hood clearance issues.

How much more power can i expect with the hydraulic roller over a flat tappet?
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Old 01-14-2011, 01:45 PM
How fast is fast enough?
 
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Originally Posted by hobby28
I am looking to be above 400...nothing fancy here just 200 cc runners on heads and probably a performer rpm intake due to hood clearance issues.

How much more power can i expect with the hydraulic roller over a flat tappet?
There's no clear cut answer to your cam question as all cams are different, it usually comes out at about 25hp though.

I would seriously rethink your compression unless you're planning on running E85. 10:1 would even be high for your application, 11:1 is way too much. 9:1 would be adequate and allow you to run 87 octane and still get 400+hp.
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Old 01-15-2011, 03:58 PM
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Hes right 11:1 on a rpm intake is pretty high, not going to be a good combo. If you cam an 11:1 motor right for gas the power range will be in the neighborhood of what a single plane wants more than a dual plane i would stick around 9.5:1 and get a good hyd roller in about the 270-276 degrees range, will make good torque a little lower and have good street manners.
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