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Old 10-02-2010, 01:43 PM   #1
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Bottom End

I've been planning on forged internals, but my friend is building an ls1 and is using the stock rods n crank. I'm going to get new pistons but he told me to check and see how much hp the 5.4 rods n crank can take. He said it should be able to hold what i'm going to do since it is out of a heavy duty truck that was made for towing. I think i'll make anywhere from 400-450 if i'm lucky.
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Old 10-02-2010, 02:34 PM   #2
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Re: Bottom End

5.4 comes stock with forged internals.. Doesn't it?
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Old 10-02-2010, 10:51 PM   #3
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Re: Bottom End

The internals on a 5.4 2v is the same material they used for te 4.6 2v. I'd upgrade the rods and pistons since they are usually the first weakest link. Even the Lightning isn't fully forged, the Navi motor for some reason boasts a forged crank on most models.
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Old 10-04-2010, 12:01 AM   #4
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Re: Bottom End

Thanks. And by the way no the internals are not forged stock.
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Old 10-04-2010, 12:16 AM   #5
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Re: Bottom End

You could probably push more power than that on a forged crank and rods. I found a set of Manley forged rods on eBay for around $270 the last time I checked.
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Old 10-04-2010, 10:21 AM   #6
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Re: Bottom End

there are different 5.4's the GT500 just has one version and its rods are MUCH weaker than my 03 cobras
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Old 10-04-2010, 10:32 AM   #7
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Re: Bottom End

As long as you're in there, you might as well put the good stuff in just in case you change your plans later for whatever reason. That's the main reason I don't have a running 5.0 yet...every time I convince myself to half *** it with stockish parts, my brain calls me stupid and tells me to do it right the first time so you don't have to go back in there later.
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Old 10-04-2010, 12:08 PM   #8
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Re: Bottom End

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As long as you're in there, you might as well put the good stuff in just in case you change your plans later for whatever reason. That's the main reason I don't have a running 5.0 yet...every time I convince myself to half *** it with stockish parts, my brain calls me stupid and tells me to do it right the first time so you don't have to go back in there later.
That seems to be a tough predicimate. I have a Heads/Cam 306 for my 5.0 and all the stockish parts to get it put together (suspension and all) but I really want to make this car a show car from top to bottom so I'm in the air about what to do. I really want a Mustang and sometimes I just want to put it together so I can drive it.
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Old 10-05-2010, 09:47 PM   #9
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Re: Bottom End

Eagle sells a complete forged rotating assembly kit to include crank, rods, pistons, etc. on SummitRacing.com for $2400. Well worth it IMO if you're going to be boosting, because there's always room in that setup for more power without the worry of throwing a rod or other type of catastrophic failure.
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Old 10-05-2010, 11:42 PM   #10
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Re: Bottom End

I can get way cheaper than that and I'm not going with eagle parts if I do get a new bottom end it will be frpp crank manley rods and keith black pistons. I was set for a while on forged but when my buddy told me that his cast assembly is rated like 650 he told me to check and see what my stock stuff will hold.

Here is what I have if you didn't already know.

2002 f150 short block

96-98 cobra 4v dohc heads

Here is what I plan on.

Homemade intake manifold.

vortech v1 centrifugal supercharger

Homemade bracket (for supercharger)

I want to build it right but In my logic this is a 03 cobra with more displacement and a different style supercharger (besides short block) and they are like 380 or something stock and I can see myself getting a little more with some work and a lil money.
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Old 10-06-2010, 09:36 AM   #11
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Re: Bottom End

Ok, if you're going supercharger, the simple answer is forged no matter what your buddy told you. The excess heat from the charger and the pressures it will be under mandate forged. You could stay stock, but then you're just playing with fire.
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Old 10-06-2010, 11:19 AM   #12
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Re: Bottom End

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Ok, if you're going supercharger, the simple answer is forged no matter what your buddy told you. The excess heat from the charger and the pressures it will be under mandate forged. You could stay stock, but then you're just playing with fire.
+1, I couldn't have said it any better.
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Old 10-06-2010, 11:43 AM   #13
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Re: Bottom End

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+1, I couldn't have said it any better.
+2 You'll regret slinging that rod or blowing a hole in that piston if you go cast
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Old 10-06-2010, 09:53 PM   #14
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Re: Bottom End

What do you guys think about the cams on these heads i'm sure they are stock. I didn't know if those are pretty good cams only reason I don't want new ones is because I have to buy 4.
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Old 10-07-2010, 11:00 PM   #15
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Re: Bottom End

The S197 GT 500 doesnt even come with forged internals.You would think for that money it would.....still strong though.
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Old 10-08-2010, 07:12 AM   #16
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Re: Bottom End

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The S197 GT 500 doesnt even come with forged internals.You would think for that money it would.....still strong though.
Sure it does. Who told you that? The rods are crap, but it can still hold a reliable 700rwhp.
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Old 10-08-2010, 09:34 AM   #17
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Re: Bottom End

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Sure it does. Who told you that? The rods are crap, but it can still hold a reliable 700rwhp.
You just contradicted yourself. lol

The rods are holding up, but they are not truly forged like the 03/04 are.
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Old 10-08-2010, 11:16 AM   #18
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Re: Bottom End

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Sure it does. Who told you that? The rods are crap, but it can still hold a reliable 700rwhp.
Sure it can hold power really good but its not forged like stated above.
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Old 10-08-2010, 11:34 AM   #19
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Re: Bottom End

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Originally Posted by DDTCM View Post
The S197 GT 500 doesnt even come with forged internals.You would think for that money it would.....still strong though.
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Originally Posted by tigerfan2771 View Post
Sure it does. Who told you that? The rods are crap, but it can still hold a reliable 700rwhp.
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Originally Posted by PureVenom View Post
You just contradicted yourself. lol

The rods are holding up, but they are not truly forged like the 03/04 are.
Quote:
Originally Posted by DDTCM View Post
Sure it can hold power really good but its not forged like stated above.
Ok guys ...time to clear the confusion.

PureVenom is the answer to DDTCM's original statement.
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Old 10-08-2010, 12:04 PM   #20
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Re: Bottom End

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You just contradicted yourself. lol

The rods are holding up, but they are not truly forged like the 03/04 are.
there are different processes used in forging. just cause they didnt use the traditional method doesnt mean they arent forged. I cant see how a car can handle 700+rwhp reliably without having forged internals. the crank and pistons are definately forged. i was just correcting the statement above.
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Old 10-14-2010, 06:35 PM   #21
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Re: Bottom End

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What do you guys think about the cams on these heads i'm sure they are stock. I didn't know if those are pretty good cams only reason I don't want new ones is because I have to buy 4.
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Old 10-14-2010, 06:35 PM   #22
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Re: Bottom End

This is not a gt500 engine it is out of a f-150
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