Dart 195 aluminium heads

Dart makes a good product. It is just if they are matched to the rest of your combo. I have a pair of steel windsor sr's on my 351 and they work great for my combo.

You're spending a bunch on some good parts - but your combo seems mismatched for what you say you want to accomplish - at least to me. I'd get one of the custom cam makers to design a cam for you - you've got a lot of head and motor/compression/cubes there. The Z cam seems like just a guess on someone's part - and it was configured to work with 302 cubes, not 347 - your increased displacement makes a difference. Also, the GT40 intake is likely to limit your intake flow. You've got heads that will flow 285, but that manifold barely tops 200. You're gonna need a much more serious intake set up to take advantage of those heads. Not that you asked.

5ohjoe87 said:

By the way what rims ad tires did you run on that 11.61 pass... And does anyone know If I will need a roll bar if I get into the 11's or 12's to run .

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That is Mickey ET drag 28x9 on 15x8 inch weld wheels. You can fit a 28x10.5 under the stang, but it takes some hammer work to get it in there. ET streets and ET drags are different in the sizes. A 10.5 et street it smaller than a 10.5 et drag!

NHRA rules are very simple when it comes to rollbars. At 11.99 and quicker you need a roll bar. There is also a mph point where you would need a roll bar, but that is not as common place. You usually dont run 12.3 at 135mph or what ever the mph-roll bar-limit is.


So that means that you can run 12.0 all day long with a helmet and stock seatbelts and be legal.

It would be worth the $5 to get a rule book. It is in plain english and fairly easy to understand.

Let me warn you that bolt in bars are not NHRA legal. It has to be a certain thickness and quality of material and welded. A swing out door bar can be used under certain conditions.

I look at the rules this way. They are there for my safety, so I make an effort to adhear to them.

5ohjoe87 said:

is 10:4:1 a low enough compression ratio for a blower ?

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No, not on pump gas. You are about at the limit for a N/A motor on pump gas. To add a blower to it would make it worse. Plan on $6+ a gallon for race fuel unless you keep that thing N/A.

Sounds like you need to take a step back and get a plan. It costs to much money to buy parts on a whim. Remember that bigger and more is not always better. There is a point where heads and cams are too big. Make the car a beast to drive and you'll end up hating it.

I'm with hllon4 - slow down and figure out what you really want before proceeding. Unless you don't care what you end up with - in which case forge ahead. When you don't know or care where you're going, any road will take you there! If you're gonna add boost and want to run pump gas, you need to be in the 8.5-9.2:1 range. Many fine blown combinations out there running stock sized combustion chambers and stock forged pistons. If you're going naturally aspirated with the aluminum heads you can be up around 10.5:1 and manage just fine.