parish8

iTrader: (6)

i need some rods and pistons, probably get some good head bolts too. now for my question. should i just get those parts and then spray the **** out of it(along with 9-10psi)? or go with a stroker? for about the same cost i could do a 408 stroker(stock heads and cam) or a heads and cam 369. hmm, or do the 408 and save up for the heads and cam on that. and for that matter why not a 421?

stock 6.0(3.62x4.00) = 364
.030 over 6.0(3.62x4.030) = 369
.030 over and a 4" stroke(4.00x4.030) = 408
.030 over and a 4.125" stroke(4.125x4.030) = 421

my budget when the motor lets go may have an effect on my route but if it lasts thru the summer i will have time to save up for any of these options, kind of leaning toward the 408 along with heads a little later but why not a 421? any oponions?

OOsilverado

Go for the 408, the 421 has more stroke than bore, the ratio would be crappy, I think the 408 would have a better looking torque curve and power range.

so if you go with a stroker does that mean you are going N/A or only one power adder???

the non stroker motor would give you better mileage on the street, and probably be better overral on the street, but im not completely sure about that

parish8

iTrader: (6)

i plan on keeping both power adders. if i spin the whipple up close to it's max rpm i should be around 12 psi on the stock 6.0. i am thinking about a 9 or a 9.5-1 408 with 6psi and a 150shot. if the whipple will go higher than 6psi i will try it and see how it runs but i wouldn't expect it to be able to feed much more than 6psi especialy if i get some heads on there someday.

i just don't know what to do. some days i think a stock crank with lower compresion forged pistons and rods at 9psi with a 150shot would be prety cool and only $2500 or so. run good gas and hit it with more boost even. and work my way into some heads eventualy. hmmm. lots of power there i bet.

BigTex

iTrader: (16)

I've asked myself the same question, or a slightly similar question anyway. Is it better to spend way more money and increase the stroke?

A good 369 ci motor with forged internals will be pretty darn stout. If I have any issues with my new LQ9, I'll go this route. I don't want to spend that kind of money on a stroker crank. I'll wait until the prices come down to a reasonable level. Have you seen the price for SBC stroker kits? They are cheap compared to the LS1.

Typically a stroker has a nice increase in torque, but thats exactly what your whipple gives you. How about a 408 and an intercooled Procharger. Big torque from the stroke, big HP from the boost.

We need to find a way to get that whipple intercooled. Either that or swap to another charger (or turbos <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) with intercooled boost.

Slowverado

i agree with richard on the 408. that's what i was planning on doing...and still am really. more than likely that's what will end up in the silvy, i have also been thinking turbo lately from talking to one of the guys at speedtek a few weeks ago about them i use to think i wouldn't like them but now i think i might. Parish...go with a 408 with a different charger and intercooler and a 150-200 shot.

Matt

parish8

iTrader: (6)

damn, coming down hard on the old whipple <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> , i really like the whipple, intercooled would be nice though. there was a time not long ago where i questioned the usefullness of the whipple but i think i was just chasing my tial with a false knock problem. i know i have done alot of mods to my truck but i really think i can get a 12sec slip with just the whipple and only a 6psi on pump gas. that seems prety good to me for a big heavy truck with a stock 6.0 and a whipple. as far as the turbo goes yea there is no doubt a turbo on a 6.0 or any of those combos would be the best and who knows if i get bored and come into an extra 5k+ i might just try one especialy if someone makes a kit for us.

back to the big motor. let me lay this out for ya, forged pistons(8.5-1 and .030 over), forged rods, head studs, good head gaskets, stock heads and cam. existing fuel system(with pump gas) for the motor and a seperate cell(with the best gas money can buy) and pump for the nitrous.<<< will this hold 8psi and a 150shot?

i think i could get all that done for ~3k, hmmm, very tempting, if by some miricle i manage to pull a high 11 with my current set up i would think this would get me some prety low 11 ET's

BigTex

iTrader: (16)

The way I see it: - If you get an 11 second slip, you will want low 11 next year and upgrade the motor. If you get a low 12 second slip, you will upgrade the motor sooner to get that 11 second slip. Its not a matter of "if", its just "when" you do it.

Is a stroker crank going to provide you with that much more power for the $2500+ investment? You already have two power adders, just build a super strong 369 for less money and throw more nitrous and boost at it.

Hey, you just need to find another power adder!

Hit Man X

Well a 408 is very close to being square (bore and stroke are equal when square), hence the nice even power.

I like the undersquare. A 4.125" crank will yield more torque than a 4" crank or a stock crank. Oversquare with just a huge bore will gain horsepower but not nearly as much torque.

I don't see why you wouldn't be able to spin a 421 (4.030" X 4.125") up to 5800RPM or more.

Do it right the first time, go for more stroke as you will gain massive torque. Who wants to rebuild a bottom end again? Not me

GoldenVelvet

This forum has something like 12,000 registerd. Therefor you will get something like 12,000 different answers.

So here is my .02

My drag car, a 1970 GTO with a 455, has a stock bore of 4.151 and a stock stroke of 4.21. Mine is closer to 468 cubes now

At 3000 RPM it dynoed in at 572 foot pounds
At 4500 RPM it has the same 572 foot pounds
In fact it never dropes below 540 foot pounds of torque EVER.

I feel that most of that is due to the large stroke and a close bore/stroke ratio. I love the MASSIVE low end power that strokers tend to give. The only trade off is I have no high RPM. Redline at 5500. I run low 10's and shift at 5200 and run off pump gas in my drag car. My Truck is still slow though.

So I say go big. Your already in the motor you might as well go all the way.

BigTex

iTrader: (16)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by GoldenVelvet:
<strong> So I say go big. Your already in the motor you might as well go all the way. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">DREAMWORLD: A C5R block with a 4.25 stroke gives you a nice easy 454. Go all the way!!!