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are my heads good enough for my new short block?
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Posted: 10/09/12
03:08 PM
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whats up fella's ? i have an all out drag s10 turning 7000 rpms with a sbc 355 with untouched dart iron eagle 200cc 2.02/1.60 valves, my question is im buying a new short block either a 400 or 406 dart shp block with all forged internals willthe 200 cc heads be ok for this short block ? not in the budget to buy new heads. looking also in the 600 to 630 lift solid came range. what's everybodys thoughts? i might be able to squeeze some money for a mild port job if the would help. also running a victor jr intake with a quick fuel 750 carb.
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pepsi1
Guru
| Posts: 1661
| Joined: 09/11
Posted: 10/09/12
05:58 PM
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Wrenchnnutz
When you get into the .600 to .650 cam for it to make power you will be spinning your small block into the upper part of 7000RPM to make power.
Your heads are too small. You will need heads in the neighborhood of 235cc to 245cc with a good competition valve job, and clean up any left over material left in the bowl and seat area.
Your 2.02 and 1.6 valves are okay. A 2.055 intake and a 1.625 exhaust valve is for the next step in power. Keep an eye on your plug color... 
The 750cfm carb will work. If your engine lays over on top end. The first place I would look is the carb. Sometime a 780 to 810 may work better. I look at everyone running a 1/4 mile. But the theory is still the same. Your gearing will also be something to watch. (Your still pumping air)  
The Victor Jr. is okay. Gasket match the intake/side about 2" up into the chamber and gasket match the carb side.
An 17/8" to 13/4" long tube header with a 3.5" collector will work.
Bob
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pepsi1
Guru
| Posts: 1661
| Joined: 09/11
Posted: 10/09/12
10:47 PM
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Wrenchnnutz
You can use those heads the way they are. Please don't misunderstand me.
You can port match them with the gaskets you will use.
Just make sure you have the same CC's in each chamber.
Also make sure your heads are nice and flat, and use a
Fel Pro steel shim head head gasket. You can use aluminum
spray paint, with (2) nice thin coats on each side the gaskets. You
don't need to buy that expensive sealer for head gaskets. Lay the
gaskets flat. So the paint doesn't run to one end, and you get an
eneven amount of sealer on the gasket. The cheep aluminum paint works fine.
When you run your cylinder heads the way they are, and then go
to a bigger intake runner you will hear the difference also.
Please let us know what your doing. We usually never hear from
the people we try to help. So we never know if we helped or
hurt someone in the process...It's disguraging....
Bob
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Dave632
Guru
| Posts: 1889
| Joined: 07/08
Posted: 10/10/12
06:14 AM
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Sounds like good advice Bob.
I know what you mean most new posters ask a question
and never come back.
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]
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pepsi1
Guru
| Posts: 1661
| Joined: 09/11
Posted: 10/10/12
08:58 AM
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Dave:
Thanks Dave, we all try to help. Like I said did we help you with your problem or not. Let us know either way. That would be appreciated. We do thise because we like our Hobby. Thanks again Dave.
It makes you wonder why we try to help!
Bob
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Posted: 10/10/12
05:51 PM
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whats the benefit of the steel shim head gaskets? i also have 1 7/8 fenderwell exit headers. now im wondering if i should back the short block down to a 383. thanks for all the input from every one !!
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Posted: 10/10/12
06:03 PM
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go for the cubes
the benefit of the shim gasket is it's thin...increases compression ratio some... .3/.4:1 increase in some cases, depending on thickness of thicker comparison gasket...
anybody else confused yet 
 
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skyeking
Addict
| Posts: 2583
| Joined: 08/09
Posted: 10/10/12
06:52 PM
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Hi People,
Sometimes the "Flakes" are a P.I.T.A...
skyeking
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