4.6 build up
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Old October 29th, 2013, 09:18 AM   #1
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4.6 build up


First I wanna say I put this here because theres more people. Plus its the same engine platform just a different body.

In the spring I plan to build up my gt. I'm going to have about $4-5k to work with. I know I need wheels, tires, and brakes. So there's about $2500 gone. So $2500 roughly to work with on the engine. What is the best platform to start with engine wise? I would like to eventually get 350 rwhp safely. 400 if possible in the end. I'm starting with pi intake...stage 2 cams possibly...and I'd like heads if I can swing it. Would this put me roughly at 350 with a good tune? If I can find a buyer for my exhaust setup, I want longtubes. From what I read, this should get me close to 350 safely. I evetually would like to boost it so I want a solid platform. May put in a cobra crank if I pull the engine.
The car has almost 100k miles so I wanna build what usually goes first. Manifolds and engine tick. Steer me in the right direction.

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Old October 29th, 2013, 11:57 AM   #2
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Why not just put a blower on it now? You will have 350-370whp and its plenty safe. NA cams will be useless with a blower and you will need to replace them. These engines will last just fine if you maintain them.

IMO Id boost it, do suspension and supporting mods then look into a short block and more boost.
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Old October 29th, 2013, 12:09 PM   #3
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If you plan on eventually adding boost, then just do it now. Keep in mind the non pi Pistons are different and if you use PI heads you will have more compression. I wouldn't use a NA stage 2 cam on a blower car for your goals.
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Old October 29th, 2013, 12:25 PM   #4
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I thought about boosting it now but then I worry about my engine taking a shit on me. I want npi heads to keep the compression low for boost. I could port n polish my current heads i guess. Then upgrade the rods and head bolts. Can I run stage 3 cams without boost or will that really hurt power without the blower?

And I'm not sure I could swing a supercharger kit under $2500. I read that thread on a guy piecing one together cheap but he got lucky. Supercharger+fuel setup+tune
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Old October 29th, 2013, 12:41 PM   #5
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I paid 1700 for my whole kit, Headunit was just rebuilt by vortech before I bought it too, intercooled, spent 400 on tune, 300 on new MAF (not needed but will be later)and 250 on pump and injectors... it can be done for pretty cheap.
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Old October 29th, 2013, 12:42 PM   #6
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how much rwhp you puttin down? And what psi. I can only run ~8 psi safely on stock engine.
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Old October 29th, 2013, 01:01 PM   #7
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Originally Posted by WhiteNoise View Post
I thought about boosting it now but then I worry about my engine taking a shit on me. I want npi heads to keep the compression low for boost. I could port n polish my current heads i guess. Then upgrade the rods and head bolts. Can I run stage 3 cams without boost or will that really hurt power without the blower?

And I'm not sure I could swing a supercharger kit under $2500. I read that thread on a guy piecing one together cheap but he got lucky. Supercharger+fuel setup+tune

I would talk to jim about his cams. From what i have seen, most stage 3 cams require pistons to be notched and move the rpm range pretty high. So i would assume you would need to switch out your intake. Any cam SHOULD help performance over the stock but it might feel slugish off the line without the blower if you are looking at a stage 3. Are you planning on pushing over 600 hp?
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Old October 29th, 2013, 02:36 PM   #8
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Originally Posted by WhiteNoise View Post
I thought about boosting it now but then I worry about my engine taking a shit on me. I want npi heads to keep the compression low for boost. I could port n polish my current heads i guess. Then upgrade the rods and head bolts. Can I run stage 3 cams without boost or will that really hurt power without the blower?

And I'm not sure I could swing a supercharger kit under $2500. I read that thread on a guy piecing one together cheap but he got lucky. Supercharger+fuel setup+tune

The engine wont take a shit on you long as the tune is good. Dont waste money on NPI heads. When you build the motor you can drop it with better pistons. The head bolts dont need to be replaced. I running OEM FORD botls with 500 hp. As for the rods bolts, the rods themselves will prolly fail before the bolts.

Originally Posted by WhiteNoise View Post
how much rwhp you puttin down? And what psi. I can only run ~8 psi safely on stock engine.
8-10 psi is very safe, many guys here are doing it. With cams some guys are even breaking 400whp on a stock engine. Under 10psi you shouldnt have any problems.
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Old October 29th, 2013, 03:30 PM   #9
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As on now, being in college, I dont plan on breaking 600 soon. I would be comfortablr hitting 400 rwhp. Im competting with all these new cars that make 300-350 stock and getting over 20 mpg.

So people are breaking 400 running 10 psi??

Besides the blower, what supporting mods should I look at to make 400 safely? Rods seem like a good upgrade but I figure if i have to tear the engine apart, why not replace some of the things in there that are going to be weak.
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Old October 29th, 2013, 03:30 PM   #10
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I bought my kit for 2k shipped with 5k miles on it, If you know a good dyno tune shop you can run 8psi safe no problem. Eagle has like 95k supercharged and has something like 170k on his stock 2v.
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Old October 29th, 2013, 04:43 PM   #11
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For 400 rwhp you don't need stage 3 cams. Stage 1 would work perfectly fine. For budget rods go with termi take out or coyote rods. You can also find Termi pistons for cheap. It will drop your compression a little and be more boost friendly.
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Old October 29th, 2013, 05:11 PM   #12
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350 won't happen on NPI heads N/A. For LT's/full exhaust, stage 2 cams, pi swap, bolt ons ect... you'll be just over 300. You'll need some nicely ported PI heads, a larger cam, full exhaust/bolt ons and a GOOD tune to sqeeze 350. BTW 2500$ is a bit low for 350 HP IMO. Unless you buy a lot of used stuff and get really good deals.

In all honestly my PI swap and CMS stage ones with bolt ons and 3.73's were enough for me. Car pulls awesome in third and pretty good in forth.
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Old October 29th, 2013, 05:14 PM   #13
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Boost it now and find a good tuner. thats what I would do
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Old October 29th, 2013, 05:47 PM   #14
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I'm selling my blower if you're interested. Should be pretty easy to be around 400 rwhp. I was at 380 with a 3.33 pulley and no other mods for the most part.
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Old October 30th, 2013, 11:17 AM   #15
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Originally Posted by WhiteNoise View Post
As on now, being in college, I dont plan on breaking 600 soon. I would be comfortablr hitting 400 rwhp. Im competting with all these new cars that make 300-350 stock and getting over 20 mpg.

So people are breaking 400 running 10 psi??

Besides the blower, what supporting mods should I look at to make 400 safely? Rods seem like a good upgrade but I figure if i have to tear the engine apart, why not replace some of the things in there that are going to be weak.
With cams people break 400hp. You will hear stories of guys makin 400+ and blowing up. I was one of them, but I upped the boost to 14psi on stock cams to make it happen. It seem that with 8-10 psi and cams lows 400s are safe.

Honestly though at that point traction becomes a real issue and you can even use all the power. Your best bet on a budget is to boost it. BONE STOCK you'll make around 350hp. with a upgraded intake for the supercharger and an exhaust you can get closer to 380hp and not have to touch the engine. It will last you a life time like that. From there you can build the car up slowly.

I was planning to sell my blower over the winter but if there is interest sooner I could let it go early.
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Old October 30th, 2013, 05:43 PM   #16
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So intake your not talking a pi intake swap for me.. Your talking like a typhoon intake or something right? And I have straight pipes so there's no exhaust restriction. Headers would help but I'm saving that project for when the manifold cracks or i pull the engine. As for traction, I'm planning on getting 305s in the rear for street. I need some lca's and 31 spline rear for slicks.
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