Heads?

Alex46

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#1

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I have done everything on the engine but these. Want to change it to a 4 valve so i can get a lot more power but also heard about some new heads trickflow was coming out with a few months ago that people were raving about. What are the best in your opinion?

Regards,

Alex

 

mogs01gt

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#2

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In a price comparison, the trickflow heads + cams will give you more power for cheaper. Porting the 4vs and upgrading the cams will run you a lot of money.

Get the trickflow.

 

Alex46

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Appreciate it. Yeah i wasn't go to do the 4 valve swap unless i found some package deal, it's just way too much. Were those new trickflows over hyped or is the air flow as impressive as they were saying?

Edit: What are the new Trick Flows called? The 185 series?

 

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bboylobo

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#4

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wouldnt you have to drill your block to coonvert to a 4v?

 

Alex46

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From what i understand you just have to change the timing chain. A friend did it. But there's a compression issue i wasn't thinking about. When you go to the 4v your going to have lower compression but still a 40 horse gain. But hearing you can get that with these Trick Flows (with upgraded intake, TB, Mass Air, Headers, exhaust

 

mogs01gt

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bboylobo said:

wouldnt you have to drill your block to coonvert to a 4v?

Click to expand...

No, you have to drill a 4v block for 2v heads.


The Trickflows arent hyped.

 

Winters98GT

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#7

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Alex46 said:

From what i understand you just have to change the timing chain. A friend did it. But there's a compression issue i wasn't thinking about. When you go to the 4v your going to have lower compression but still a 40 horse gain. But hearing you can get that with these Trick Flows (with upgraded intake, TB, Mass Air, Headers, exhaust

Click to expand...

There is more to putting 4v heads on a PI block than just the timing chain. If you can afford the Trickflow, I would look at those.

 

Alex46

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Think i am going to go with the Trick Flows. But what series are these new ones? Went to there site and they only have one pair. Guess that's it. Seemed to rember though that they didn't offer any for the 2v, but it's been a few years

 

Tim2002GT

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#9

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They offer 2 different heads for 4.6's. The combustion chamber sizes is the difference. You will want the smaller chamber heads. They will also give you a slight bump in compression over your PI heads.

 

Alex46

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Thanks Tim. Why do i need to go with the smaller one's? Everything in my intake to exhaust is upgraded. Or does it have to do with something else?

 

Winters98GT

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Alex46 said:

Thanks Tim. Why do i need to go with the smaller one's? Everything in my intake to exhaust is upgraded. Or does it have to do with something else?

Click to expand...

Compression.

 

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ninjastang125

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Mar 12, 2010

#12

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The smaller chamber will bump your compression, which will compliment all of your bolt ons. The smaller chamber is for npi cars, they are the same chamber size as a stock p.I head. The heads your are looking for are the twisted wedge 38 cc chamber.

 

Tim2002GT

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#13

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ninjastang125 said:

The smaller chamber is for npi cars, they are the same chamber size as a stock p.I head.

Click to expand...

You actually have it backwards. The smaller chamber heads are designed for the PI cars. They have a deeper dish in the pistons stock than NPI cars do.

 

Alex46

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PI Power Induced? Plan on putting a Kenne Belle on it, but not until next year. Wanted to get in high 11's NA with stock block and Crankshaft, but I don't think i can with this DD

 

Winters98GT

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#15

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Alex46 said:

PI Power Induced? Plan on putting a Kenne Belle on it, but not until next year. Wanted to get in high 11's NA with stock block and Crankshaft, but I don't think i can with this DD

Click to expand...

No, it's "power improved".

You really need to plan on what you want to do with your car.

The 2v Crank is good for 500-700hp. You don't need to mess with a Cobra Crankshaft. The stock block is good for over 400rwhp.

If you want to go 11's on the stock block, it can be done and be a daily driver.

If you have not done headers/gears, then I would start with that. Then, go with a power adder. The Kenne Belle Blower should have you knocking on the door of 11's with a nice 60ft. I am sure Tim, and other Nitrous guys can point you in the direction if go that route. Eitherway, I would leave the PI heads and Longblock(maybe cams) alone. If your goal is 11's on the stock block with a power adder, you are going to be spending a lot of money on heads/install/tune right now if you decide to tear the motor apart and go with Trickflow heads. Factor in the labor if you are not doing the work. I would save the money for the blower.

 

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ninjastang125

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#16

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Yea tim I did get it backwords I got to far ahead of myself. The larger chamber is for npi and the smaller is for pi. This guy wants to go 11s on motor then put a kb on. Good god.

 

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rconaway

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#17

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I did ported Livernois heads with their stage 1 cams. Check the Sig andsee if thats enough power and we aren't even close to finished yet. We expect 700+. If I upgrade the blower to an SI, then expect 750 or better.