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Author Topic:   400 block questions?
dirtracer50
Member
posted December 26, 2003 09:53 PM
I'm working on a 406 and am wondering if it is necessary to use gaskets with the steam holes? I plan on buying Pro Action heads do they come with the steam holes allready drilled? Does anyone have any experience with block filler and how does it affect temperature? Thanks for any help.


sdhnc29
Member
posted December 26, 2003 10:27 PM
You do not need the steam holes for a race engine.

Some will tell you different, but block filler is a waste of time and does not belong in an endurance type engine.

Steve

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


dirtracer50
Member
posted December 26, 2003 10:38 PM
Thanks steve. You are a large reason why I like this board so much. I really appreciate the help.


dirtracer14
Member
posted December 26, 2003 11:39 PM
Hey #50 i haverun block filler in 2 diff motors...first was a 383 with cast pistons and lasted 30 races or so...befor rebuild...still have the block. The other was a 377 that i got about 7 nights out of before burning 2 pistons...from det i think. I am not saying that its is good stuff but i have used it befor...the heat was not a big deal but i did not run either motor more than i had to and changed oil allot.


dirtracer50
Member
posted December 27, 2003 02:45 PM
Thanks Craig I remember reading one of your posts before about using it and was wondering if any one else had any comments. I'm trying to learn this stuff for my big switch to the mods next season. What head gaskets do you suggest. Thanks for the help. Kris #50


dirtrace
unregistered
posted December 27, 2003 06:23 PM           
steves right no block filler, or steam holes needed, just dont let it idle forever..

most guys use marine fel pro head gaskets. Im going to use copper sce gaskets that are reusable. Theyve allways worked great in my 383s and 355s.

this is my 3rd 400 block to use, and both others were apart at the 2nd and 3rd race broke of course, both had the gasket burnt allready between the center cylinders.

Most of my friends who only ran 400s said head studs were a must, and prevented the burn thru on the head gasket. I am not going to use head studs, and see if the copper gaskets work out??



dirtracer14
Member
posted December 27, 2003 07:51 PM
I do believe that the head gasket was a 1034 but i will double check....steve turned me onto then last year when i was running the 377 with the 400 block...he would know off the top of his head. I think you will be just fine in the mod class in 2004 ...think of it this way we all get to race on a new track so it will kinda help abit...


partsman2004
Member
posted December 28, 2003 08:58 AM
Listen to Steve. I build own a engine shop and he is right on the money.

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Partsman


rocket36
Member
posted December 30, 2003 02:23 AM
i would have thought you would want the steam holes. our 400 has them. we followed the head manufacturers instructions and drilled them in the heads and haven't had a problem.
if you don't have them, the air will not be able to escape as this will become a high point in the water jacket that the air can't bleed from and you will have a hot spot.
when you drill the steam holes (in your heads) the air will be able to escape to the highest point, most likely being the water outlet. the only way that i can see that you can have a reliable engine without drilling them is to plumb external lines, which is worth while either way.
i guess its a bit like running the external hoses from the back of the manifold up to the thermostat housing. they're not really there to aid in coolant flow, just to allow the trapped air to bleed out to the highest point.
having said all that, it depends on your heads and the water jacket design. so best to stick with there recommendations, my bet is that they will know what they're doing, like gm when they designed the 400.


partsman2004
Member
posted December 30, 2003 09:31 AM
It is very common to plug the holes with a tappered cast iron plug. We have done it for 15 years and never had a issue. Gm did not design the 400 to turn 7500 rpm so we really can't go by what they say.

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Partsman


socaldirtmod
Member
posted January 15, 2004 07:32 PM
A little off the original theme... will a stock 400 sbc take clearencing for a 4.00" stroke crank with h-beam rods with out hitting water?? thx


SSRACER4
Member
posted January 15, 2004 09:09 PM
Never had a problem with block filler, use a half full pore or to the freeze plugs. The engine we ran two years ago, for a season with one freshing about mid season, when it came out it was rebuilt ot 60 over and is in our truck now. A lot of sprint car teams run some type of block filler not just for the strenget but it also helps dampen harmonics in the engine.
As for the steam holes it is cheaper to drill them and not need them than overheat.
As for plugging the deck holes when you do you redrill the plugs to use them to slow the flow like a restrictor in the thermostat housing it slows the flow to allow the water to remove the heat from the casting.


machine for speed
Member
posted January 19, 2004 12:40 AM
No steam holes needed. Have used the Corteco gaskets with no problems. Beware, if you dont use head studs with those heads, use longer aftermarket (ARP,Manley) bolts becuase of the increased deck thickness of the heads. If you dont you may pull threads out of the block. Good luck.


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