Paxton with heads/manifold help please

[DESRT10]

Okay, I have researched this as much as I can and am struggling to make a decision on this.

I know with a Paxton the head porting payback is much less than if the heads were going on an NA engine. From all I have read, with a big port job (ie, stage 3), the Paxton is not as easily able to supply to volume of air needed to match the increased flow capabilities.

So, with a stock bottom end, is there any reasonable benefit in putting mildly ported heads (3 or 5 angle valve job, bowl work, smooth port castings, port match to gasket etc.) and extrude honing/port matching the intake manifold. With Paxton, the head might benefit from opening the chamber a bit and making sure the exhaust is ported well.

Can anyone tell me on a bone stock engine, how close the intake manifold and heads match up. Is one typically bigger.

I know it won't hurt to have this done, but it isn't exactly free and will I already be pushing the stock bottom end with a Paxton and water/meth.

Any advice from those that have gone down this road appreciated.

 

[rottenronnie]

Yes, with most street-style superchargers that are out there, capacity is limited..Porting (Heads and/or Intake), as you seem to know, can reduce boost (depending on how far you go); but simply cranking up the boost with such a setup to try to compensate will generate considerable heat because you are going past the blower's intended use and design.

The o.e.m. heads flow pretty well but will respond to porting quite nicely. Back-cut the valves, invest in some good pushrods (maybe better springs too). This is advised whether it is a f.i. application or not.

You will increase your existing compression ratio just by installing the new head gaskets so, if you now have a razor tune, it may want to detonate a touch. Just be cautious, because you are making changes. Stay in touch with your tuner and maybe go and do some pulls on a loading style dyno.

Gasket-match your Intake Manifold (or have it done) and there won't be an issue with a mismatch in size. As long as your head's intake port doesn't end up being smaller.

Whizzy multi-angle valve jobs are fine as long as you don't go too nuts. If the seats are too thin, they will have a short glorious life instead of lasting over the long haul..

Planned properly, GOOD heads PLUS a proper f.i. system can produce some very high power.

Ronnie

 

[Troy's QC SRT]

I would save the extra money from the head job, save a little more and just build the bottom end....safer and you'll make more power being able to kick up the boost..... as far as your actual question I head that FI will sorta cancel out the P/P heads but you will see some gains over oem heads..... I'm sure someone (Ronnie/Tony) will come in and give you the details......

 

[Troy's QC SRT]

ha ha well there you go!

 

[DESRT10]

Ronnie, thanks for the great input. That helps a lot.

Bryan

 

[blown04]

def spend the money on the bottom end. Paxton is coming out with a new head unit that is supposed to flow 50% more. I'm hoping the new Novi 2500 will be able to keep up the boot on a free breathing unit so you can take advantage of a better breathing motor and keep up boost.

 

[Tito#14SRT]

I would spend the money on the bottom end first, do it right the first time so your engine has a less chance of going BOOOOOMM!!!! then do some head work and slap the blower on it crank the boost up

 

[NettlesD]

Just out of curiosity, how much are we talking about spending on a built bottom end? A very rough estimate would be good.

 

[LoveThisTruck]

Just out of curiosity, how much are we talking about spending on a built bottom end? A very rough estimate would be good.

Depends on what all you wanna do.... figure 10k on up.

 

[JTS VENOM PERFORMANCE]

we are now on the 10k- side

 

[LoveThisTruck]

we are now on the 10k- side

Lets hear about it... I might be doing another build when I get back from this deployment and I'll be in your area.

 

[JTS VENOM PERFORMANCE]

yours is o4 right? I think I got an 04 block, got k1 rods in stock and ordered .5 over pistons for stock, but should be able to do a good strong rebuild in the 8k area,

oh and send those hickies first chance you get asap if ya can, let me know the total, and if you wnat will send you a check so you dont have to incure th fees buddy
or I can sedn it however,

but rods, pistons, coated bearings, decked, honed, and not sure, but I may be able to include the upgraded oil pump deal in the deal also and possibly a head clean up,

builds are kinda loose as most have found, but I try to include most everything I can striaght off so there is no surprises, the only thing that may not be included are things like the timing chain, lifters cam

now billet mains are xtra because of cost of line boring

 

[LoveThisTruck]

yours is o4 right? I think I got an 04 block, got k1 rods in stock and ordered .5 over pistons for stock, but should be able to do a good strong rebuild in the 8k area,

oh and send those hickies first chance you get asap if ya can, let me know the total, and if you wnat will send you a check so you dont have to incure th fees buddy
or I can sedn it however,

but rods, pistons, coated bearings, decked, honed, and not sure, but I may be able to include the upgraded oil pump deal in the deal also and possibly a head clean up,

builds are kinda loose as most have found, but I try to include most everything I can striaght off so there is no surprises, the only thing that may not be included are things like the timing chain, lifters cam

now billet mains are xtra because of cost of line boring

Ya it's an 04, but I might be getting a car when I get back
Hickies?:dontknow:

 

[JTS VENOM PERFORMANCE]

Ya it's an 04, but I might be getting a car when I get back
Hickies?:dontknow:

the gears ya goof ball LOLOL the kit?

oh and we can do a car too bobby, not a problem for ya good sir

 

[LoveThisTruck]

the gears ya goof ball LOLOL the kit?

oh and we can do a car too bobby, not a problem for ya good sir

You mean the tranny kit? LOL just give me a call when you get a min

 

[JTS VENOM PERFORMANCE]

You mean the tranny kit? LOL just give me a call when you get a min

when I get a minu??????? LOLOL dang dude! I aint been off the phone in three hosurs, LOLOL but iwll do buddy, not a problemo:aetsch:

make sure its a yellow car:elefant:

 

[NettlesD]

but rods, pistons, coated bearings, decked, honed, and not sure, but I may be able to include the upgraded oil pump deal in the deal also and possibly a head clean up,

Let me get this straight. For about $8K, you get rods, pistons, coated bearings, decked, honed and maybe an upgraded oil pump? Is this including a block or is it a block that the customer has to supply? I take it this doesn't even cover the crankshaft.

What should a build shortblock run (block, pistons, rods, crankshaft, bearings...ready to add everything off of your motor to drop into the truck)?