4.2/4.3 rebuild questions (or other upgrade options)
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Old January 27th, 2006, 11:58 AM   #1
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4.2/4.3 rebuild questions (or other upgrade options)


hey guys - so now that im close to done with the bolt on stuff (meaning, stuff other than h/c/i or internals) im trying to decide on the next step.


initially i was thinking about eventually going with a heads/cam/intake package or something along those lines.
another option would be just throwing a procharger at it.
the last option is starting by first going to 4.2 or 4.3 liters with new forged internals and going from there.

now i was wondering if you guys could give some pros and cons to each option. i assume that if i wanted to go FI id want to replace internals anyhow (since if i got sick of 8-10 psi or whatever is ok on stock insides, i wouldnt be able to go much further without getting forged).
so with that in mind, i dont see why , if i was to replce with forged internals, i shuoldnty go with a stroker assembly. is there a negative side to that? a whole new rotating assembly for 4.3 liters isnt that much more than a 3.8 (a few hundred bucks as far as i can tell)
then theres the heads, cam, intake.
should that be done before or after changing internals (especially if going to 4.2/3)?

also, if internals were replaced with different displacement replacements (say that 10 times fast...) i would need a tune? i have an sct2 computer, so i guess that wouildnt be a big deal but i was curious.


so bottom line (for the people who skipped the above boring text.. ) is that as far as the
NEXT engine step, i want to discuss these options
1) leave internals stock and go FI
2) start on heads, cam, intakes
3) start by replacing with possibly a 4.2/4.3 liter setup (after which i can easily go FI with forged internals) but leave the h/c/i stock




anyhow thats all for now...just trying to figure out what to start saving for

edit * also, since i probably wouldnt be able to do this stuff myself, labor is included in the price of anything id do - unless someone here wants to do it for fun (and for free :wink )
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Old January 27th, 2006, 07:17 PM   #2
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f/i w/stock internals can be done, read up here: http://v6power.net/forum/viewtopic.php?t=36444 and
http://www.vmptuning.com
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Old January 28th, 2006, 12:44 PM   #3
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I have been thinking hard about getting the 4.2 setup it is a GREAT option. It has some of the most N/A power you can get out of your car short of a v8.

If you are looking for sixer power, the 4.2 is where it is at.

Don't down the 3.8 though! It is one tough engine! Just as already stated it can take plenty of F/I punishment!
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Old January 28th, 2006, 01:38 PM   #4
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there's no replacement for displacement. the added torque of the bigger cubes would be a very nice bonus, then procharge it
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Old January 28th, 2006, 06:23 PM   #5
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thats the reason i was considering it - more cubes is more potential.

and tghe thing is, if i went FI on stock internals, then id be limited to 8 psi or so, no?
then what do i do if i want to go more...

i thought getting the most NA out of it would make more sense .

come to think of it, what is the power gain from just replaceing the rotating assembly with the higher displaement parts?
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Old January 29th, 2006, 10:21 PM   #6
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20-30 horse depending on your current modifications.
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Old January 30th, 2006, 10:48 AM   #7
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oh wow thats not as much as i thought - so you think going with intakes, then heads and cam as a start would be better? then evetually moving on to internals and maybe FI?
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Old January 30th, 2006, 05:41 PM   #8
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Start with the intake and exhaust to help it breathe, Heads, then internals, then F/I and a cam at the same time.

The cam should go in near the end cause they can be customized to your specific application very well.
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Old January 30th, 2006, 05:49 PM   #9
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20-30 horsepower is ALOT more than you think.
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Old January 30th, 2006, 07:39 PM   #10
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Originally Posted by slo2go
20-30 horsepower is ALOT more than you think.
oh, i know - but im just thinking in terms of bang for the buck.. i assume i wont do both at the same time (all internals, or all top end stuff) so in that case why not go for the bigger gains first..?

or is there something i am missing here.
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Old January 30th, 2006, 08:49 PM   #11
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Originally Posted by artisan00
if i went FI on stock internals, then id be limited to 8 psi or so, no?
justin was running about 17psi w/new headgaskets on a stock junkyard motor, but that will cause for fuel upgrades.
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Old January 30th, 2006, 10:58 PM   #12
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yeah but this is a daily driver type car, and i dont wanna be thrashing 17psi turbos through it every time i drive it


anyway, im still up in the air. i need to figure out if i want to just save for the SC kit and go with a basic boost level and leave it, or go NA. im leaning towards NA but im not sure why.

my issue there though is that i need someone who i can REALLY trust doing this kind of work.

but either way, if we assume for a sec that i want to start with NA, what makes more sense - heads/intakes or internals? i took cam out this time because it makes sense to do that last, once the final decisions are made and the thing can be ground for exactly what it will used for
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Old January 31st, 2006, 08:05 AM   #13
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really it is all about the tune on a vehicle like that

for N/A i would probably pick up a used f150 4.2 and start from there, get new rotating assembly and bump up the compression, take your SPI heads and get them re-worked with larger valves, nice agressive cam w/new springs, maybe elongate the intake runners a little and a good tune! then if i wasn't satisfied spray it
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Old January 31st, 2006, 09:21 AM   #14
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i know the tune is important, but i just dont feel like i need 17psi turbos on a daily driver that my mom may wanna borrow sometimes..
hehe

also, i dont want to go with nitrous, same reason as before - since its probably not going to see a track (at least anytime soon) or anything and i wouldnt use nitrous on the street, i dont see the point.

im just trying to figure out between top end and bottom end, what is usually done first, and what are the pros and cons of either. also i assume the labor of doing the internals is a lot more expensive than replacing heads and intakes?
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Old February 1st, 2006, 10:02 PM   #15
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i guess this isnt realy a bump since its at the top right now anyhow...
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