|04-08-2014 11:33 AM|
|04-08-2014 12:19 AM|
|lumberjack_43||The 400 in my truck has never had a problem either hottest it ever seen was 210 but that was in a thick nasty hole and it took me 3 and a half mins of WOT to go 200 feet lol|
|04-07-2014 02:08 PM|
I have no problem cooling the 400's I've done either, stock water jackets or half filled with block filler. Good radiator, good stock waterpump from a Air Conditioned car application, and the correct pulley ratio and it is no problem.
The Hot running 400 myth lives on, swap a used 400 in place of a 350 keeping the 350's single row radiator that's 10 years old and partially plugged up and of course it won't stay cool. .......But it's the 400's fault, right LOL
|04-07-2014 01:52 PM|
[QUOTE=1Gary;2251178]The 400's can use all the help it can get for cooling.
I had a half filled with Rockblock 406 with the deck plugged. I had cooling problems with it too. I used a Griffen aluminum radiator with a dual fan setup. It always ran 140 degrees, so I put the fans on a thermal switch instead of just on with the key, but it still ran only 160 at best. Finally took out 160* thermostat and put in a 180* and finally it would run at 180* If you fill block though, you need to watch oil temps when extended cruising on the street.
|04-06-2014 09:58 AM|
No bore or hone with using torque plates.No bore without sonic checking.Filling haft way up the expansion plugs with block filler helps stabilize the bores.Thin decks and thin wall bores.
|04-05-2014 07:01 PM|
|04-05-2014 06:55 PM|
re look at the cam I already posted then. Maybe go slightly bigger? and contrary to Eric but not arguing,consider 102º ICL.
note: when that cam hits its peak power,thats all you get,the power rolls off fast
|04-05-2014 11:30 AM|
If you haven't ordered the heads yet, go with a smaller chamber than 75 cc if you are planning race gas or E85 or alcohol.......64cc heads and flat top pistons will get you about 10.9-1 to 11.5-1 compression depending on how much the block has been decked....12.1-1 if you order 60 cc chambers from AFR.
Solid roller cam about 250° to 256° intake dur @ .050 with .600"-.640"ish lift 106° lobe separation.
4000 stall converter minimum.
|04-05-2014 11:15 AM|
In your case they can be blocked, they are often plugged for added strength in applications not being run at low rpm (3000 and above most all the time).They plug them using allen set screws...but don't do this on a finish machined block, only plug them before it gets bored and honed as it will distort things when they are installed.
Just allow the gasket to block them off in your case.
That linked gasket still won't work though, it will overhang the piston ring starter chamfer at the top of the bore and become a hot spot...got to be like I said, 4.180" or bigger bore gasket....if you didn't advise the machinist to put the most minimal chamfer back on after boring the cylinders (I'm guessing no to this as you didn't previously know the fact).
|04-05-2014 11:03 AM|
Was the one i was looking at but yeah no steam holes...
Has anyone blocked the steam holes? if it only starts goes to line races 200 feet then back to the trailer and shut off would i hurt anything by plugging them? besides making me heat faster
I keep forgetting about those darn steam holes on the 400s
|04-05-2014 10:38 AM|
|lumberjack_43||i want it to be snotty as can be and hit like a sleg at 3000ish rpm|
|04-04-2014 07:43 PM|
4.190" and 4.200" are common gasket bores for the 400
|04-04-2014 07:37 PM|
lets talk cam profiles,not just pulling degrees duration out of our butts!
Im thinking 10 3/4 to 11:1 CR?with those heads,,,
AFR 220s will make power past 7k in a 400.
we are talking 600 plus hp!
Can you live with a real snotty idle? Power that hits like a sledge hammer?
Or do you prefer a wide power band that is great for road racing?
|04-04-2014 07:21 PM|
Wouldn't want to hurt one of these and have to redo...
Here's your pn#
That being said, Eric is 100% right in his post, I just happened to be in the summit site when I read this so I looked lol.
|04-04-2014 06:58 PM|
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