I have been searching info on strokers and my head is killing me now. I have looked at vendors sites but would like ya'lls recommendations. I thought I would be happy with what I have mod wise but I want a little bit more now. Here is a break down of what I have:

2007 C6 M6 497/451
Callaway Honker CAI | Spinmonster Ported FAST 90mm | LG G6X3 Cam | Trick Flow 225's milled to 62cc | LG Pro Z06 headers | Catless | Z06 B&B Bullets | Mcleod Twin Street with Aluminum Flywheel | RPM Stage III 4.10's, diff, and shafts

Let me know what kind of stroker you would recommend. I know there is a 402 and for a few hundred bucks more you can get a 418. Or if I want to spend a couple grand more I can go all out and do a 427. I want to stay NA and don't have any plans in the near future for FI. I want over 500rwhp and close to 500rwtq.

Also what pistons, rods, and crankshaft would you choose? I want a good reliable motor I can count on that hopefully won't crap out on me soon.

Thanks,
Andrew

 

I chose to go with a LS3 Stroker. I believe it to be the most cost effective. You can see what I have in my sig. I could have made 15 or so more HP/TQ with headers.

 

what heads? where they ported? where did you get your stroker at?

 

I went with an LS3 stroked to a 416. Love the torque, much better then stock with heads and cam. Main thing is to get a good builder. I went with Weber Racing, to begin with, but that was a BIG mistake. Weber built a motor that wouldn't hold oil pressure because the tolerances on all the bearings were to big, and the cam bearings were wrong, and the rings were even gapped way to big. After get S2performance.com to rebuild the motor correctly I have been extremely happy with my results. I still need to put some 3" exhaust on, but it is much more fun to drive. If I had to do it again though I would get the LS7 stroked to 4.125 to get a 440CI.

I noticed you are in Dallas, you have a really good option for tuning also in Arlington.

 

I was going to say the same thing...440CI is also an option.

There was a great thread not too long ago that discussed strokers versus FI. Great read.

 

what kind of power did you put down?

 

I like the 'LS3 block based' 416-418 strokers, still cost effective and makes some great power over a 402.
The shop that I would choose to build such a fantasy motor is Cartek Performance Engineering:
www.cartek.net

 

I dyno'd on a Mustang dyno, and put down 455/455 through an A6 with major exhaust restriction at about 5500 to 5800 rpm making the power fall off there. Still haven't got the new exhaust on the car, but will do soon. Probably won't re-dyno, not that much into the numbers, just the seat of the pants dyno.

The tune just got finished also and I know we picked up more power.

 

I believe you can build a 482 with an LSX block....

 

I like the 416~418 option. Going to a 4.1" stroke, IMO, is a bit too much for me with regard to longevity even taking into account that the motor will be purely n/a. Of course, the best builders recommend no power adder on 4.1" stroke applications. I would go with the 416 and a 4" stroke. Good tq, no compromises with regard to power adder versus no power adder, and less lateral forces on the piston.

 

Unless you go with the LS7 block with a 4.125 stroke keeping the motor square. But with a LS2-3 block I wouldn't go more than a 4" stroke either.

Someone also anounced a new block at the show in Florida last month that would do 500 CI, but it was like a 4.6" stroke on a 4.25 bore.

 

Are we related?

This statement is why I went with a 440. The only cost difference is in the short block, and when spending this much I don't think thats significant. What will cost a lot is redoing things later in an effort to find more power.

Do you want to reuse the parts you already have? What do you want from the car in the end? I'd have to know more to make a good recomendation. The 500/500 you mentioned could be done with a 402, but that isn't much more than you have now, and you'd probably get used to that pretty quick. Not worth the cost to do the stroker at that point IMO.

If you decide to make big power you may want to consider gears as 4.10's will be hard to hook up.

 

yea...i may have to redo the gears...i actually found a ls7 440 stroker for a pretty good price...that same motor from the same company put down 570/521...what did you put down with your 440?

only thing i want to reuse is my heads, cam, fast, and maybe a few other things...i really just want to swap out shortblocks and sell my old shortblock...

 

I would suggest swapping the cam as well. There obviously won't be a charge for installation, and it's only another 400 bucks. Unless you plan on building a 402 the cam you have now should work well. Anything other than that and you start building a shortblock around a cam instead of the other way around.

Like others have stated if you want 500/500 do a 402. It will have plenty of wall strength and give you some lattitude to grow if you want to put a healthy shot of nitrous on it or switch to a blower later. With the 416/418s they aren't the best motors to be handling anything larger than a 100shot on a regular basis. The 402 is more suited for this.

The 440 is the best option in my opinion. Also the most expensive due to you having to use the Ls7 block. But you'll be able to make the most power, and keep it very streetable.

I have a fairy aggressive 403 now using 225cc afr's and a G5X4 cam which has a 110.8lsa, very choppy idle and not the best street manners below 2k. However, it absolutely rips through every gear and is capable of 132-133mph traps in good weather. My old head cam car made 470ish and would trap in the mid 120's. (125-126ish) The new motor although it is only 60hp stronger makes 90lb ft of tq peak more than the old setup and 70ish more tq almost everywhere. It is a huge difference. A properly built 402 will make 525 using what you have but going slightly more aggressive on the cam. that will give you 30hp more but probably 50-70wtq under the curve. That is what will scoot you down the track.

Back to the 440, you'll be able to make probably up to 550 using those heads, and a differnt cam while capping it off with the fast you have, however it will have a very different tq curve than the 402. Gears are a must at that point. I have 3.90's with my 403 setup now and it will spin the tires at anything less than 90mph in the first 3 gears from any speed...period. I considered swapping the gears out 3.42's to control the spin a little better but just went with a taller tire for the 1/4 and am doing a rear conversion and using stickier tires for the street.......it's just too much fun at this point.


Dougie

 

If you plan to reuse your parts I might look more at a 416. On any stroker I would definately get a different cam, but I believe your heads and 1 3/4 headers would keep you from seeing the full potential of a 440. You didn't mention what your goals are for the car, which would be helpful. Is it a daily driver or just a toy?

My results are in my sig.

 

it is my daily driver and my toy...my goals are to have an awesome street car and 1/4 mile car...my first time out with my et streets i ran an 11.19 at 129...my car as it sits has a 10 in it but i want faster...haha...i am putting down 497/451 to the rear...i want to see a big gain so i am think now about a 41? or a 440 stroker...as far as cams goes my shop said my g6x3 cam should work but may need to go to a g7x3 or g7x4 cam...as far as the rear goes i use 26 11.50 17 et streets with my RPM Stage III 4.10 rear...

there are so many combos to go with...just so confusing and make me mad...lol

 

If you decide to go with an LS7 block, make sure that you get the newer one with the new part number. Early LS7 blocks were found to flex at the 500-500 rwhp levels and up causing main bearing failure. GM redesigned the blocks and assigned a new part number. I think it was #4 that failed most frequently but I don't specifically remember. You may be able to get a good deal on an LS7 block but check the part number.

 

Hey guys I am very happy with the LS7 440ci. I drive it on the street and love it, runs on pump gas and i made 603 rwhp Thanks Vengeance Racing!!!!


http://forums.corvetteforum.com/c5-t...idle-clip.html

 

i saw that on another forum...very nice car...wouldn't be able to make his power with my 225 heads but i still would make alot of power...plus i would have to swap out the cam which wouldn't be to hard to do...

 

I've went thru this with my Camaro SS.

If you're gonna do it. To me, there is no other option than this one. Spend the money once and be done with it.