410 stroker hp & torque guesstimates

[passing you]

I saw valiant64's post and thought I'd get your opinions as well.

Heres the combo

bored/torque plated .040 over 360 block
KB hyper's set up at 9.8 compression
4' nodular scat crank
H beam floating pin rods
windage tray/valley baffle
fully ported j heads 2.02-1.60 chevy valves undercut at the head [waiting on flow #'s I expect 265-275cfm int & 190cfm +/- exh
Engle solid cam .573 lift 252*@.050 282*adv 110cl
Roller rockers 1.5
m 1 or ld340 intake with holley 830cfm annular carb
1 3/4 hooker headers and 2 1/2 pipes [future upgrade to 3']

[valiant64]

Definitely more than your 235 60 14's will be able to hook up with... ;-D

[passing you]

Yeah those are gonna have to come off for some MT's, ah hemm.....

[valiant64]

Get some 5X4.5 pattern axles

[Century Cp Guru]

I had A Desk top Dyno ill Have too llok for it, itwas REal accurate Too.Gotta clean this desk off.And Enough Hp to Get Ya in Trouble With CHIPS or your Local County Sheriff.

[crisser]

470-480 HP @ around 6200
450-470# @ around 4200.

Might make around 500 hp with 10.5 to 11:0 compress.

[valiant64]

Use the M1 intake. The additional cubes + lower gears & 4spd in a light car should have ample torque without the dual plane intake. Let 'er breathe!

[passing you]

Keep in mind the 408 that blueprint sells [stock magnums,9.5,dual plane, and small flat tappet cam dynos @ 375hp 480ftlbs

[valiant64]

I think that they intentionally set it up that way for a wider selection of applications, i.e., heavy car, high rear gear ratios, automatics & less maintenance (hyd. cam). I'm sure that crate engine has alot more potential with a single plane, larger hyd or solid cam. I'm still not sure why some people insist that the Magnum head is the one to use to make power with factory iron castings, though. Even if they were capable of producing a few more ponies than the early pre-Magnum casting, I'd still use the early head so I wouldn't have to be concerned about them cracking - like the Magnums are well known for...

[TeamDart]

With those heads, the single plain won't benefit you much in the horsepower department over a good dual plane, but it will lose a considerable amount of torque...

Running 580hp with a dual plane here.... but also have other wild small blocks that "need" a single plane, the dual planes of today are just so diverse it's hard to not pick one for a street car

[passing you]

magnums ported only end up in the 250's by the best maybe 270cfm with lots of work/mods.
With that said I don't think the blueprint would have much more potential then 430hp no matter what cam.

I just with I had 11.1 and a roller.lol

[passing you]

I use a single plane on a 344ci, it's definitely not a cork in the system which was my concern with the dual plane I have, though I would rather the dual plane for the more usable low/mid torque if it still fit, but then again if I put the cam straight up again and turn over 7000rpm then the single is the choice.

I'm probably making in the neighborhood of 450hp with the 344 10.5 .528 284* 240's/185 cfm in the heads now.

[TeamDart]

You don't want to turn over 7000rpm with a 4"crank, and those heads. For a street car stick with a "Realistic" rpm. With that crank you're slinging alot of weight around, and every 100rpm's just becomes that much more weight.... grams turns to pounds.....

[passing you]

I plan on about 6200-6500 with the 410ci.
The 344 used to turn 7200 w/ported x heads and making good power no problems then I put 4 1/2* advance into the cam and only rev 65-6700rpm.

car has 25' tire and a 3.73

[passing you]

If anyone has a deck top dyno they could run the #'s through for fun i'd be stoked.

[TeamDart]

Originally Posted by passing you

I plan on about 6200-6500 with the 410ci.
The 344 used to turn 7200 w/ported x heads and making good power no problems then I put 4 1/2* advance into the cam and only rev 65-6700rpm.

car has 25' tire and a 3.73

A 340 is going to make a completely different power band than a 410. My 360 stock bore/stroke makes 520hp at 7300rpm.... yet my 419 makes 580hp at 5900 rpm.... on purpose, because my 419 was to be a street car, and my 360 is in a Bracket car. What rods do you plan on using?

And on your 344 what did you degree the cam out for as far as LCA goes?

[TK]

About 410HP and TQ around 5300.

[Century Cp Guru]

My Kids 340 with A Wieand Stealth works real ,good its pretty hard To beat a LD 340 i bet the M 1 dont beat it By 10 Hp on the dyno if that much.

[passing you]

Originally Posted by TeamDart

A 340 is going to make a completely different power band than a 410. My 360 stock bore/stroke makes 520hp at 7300rpm.... yet my 419 makes 580hp at 5900 rpm.... on purpose, because my 419 was to be a street car, and my 360 is in a Bracket car. What rods do you plan on using?

And on your 344 what did you degree the cam out for as far as LSA goes?

In the stroker is a 'ohio crank kit' that came with 6.123 h beam rods, don't know who exactly made them but thats what I'm using.

The 344 has a .528 solid 112cl 284* 241*.050 60* overlap and was installed 110cl then lastly at 107.5cl

So it's at 107.5cl and uses a old 70's single plane weiand and 750holley dp.
The 344 runs real good and is no slouch.

[passing you]

Originally Posted by TK

About 410HP and TQ around 5300.

If it makes that lil it's cause it's only running on 6 cylinders.lol

[pcrmike]

The stock maggies, yeah, but the new Iron Ram heads for the Magnum is a great piece. 300CFM is not too hard with smart work on those. :-) PCRMike

[TeamDart]

Originally Posted by pcrmike

The stock maggies, yeah, but the new Iron Ram heads for the Magnum is a great piece. 300CFM is not too hard with smart work on those. :-) PCRMike

300cfm on Magnum heads? Is this on a magical flow bench or a real flow bench j/k

[valiant64]

No doubt that the LD340 intake is a great intake that was ahead of its time, and probably just as good output-wise as the newer RPM intake. But I think that the M1 single plane will have an edge over the dual plane in HP in the upper rpm range, especially when the HP goal is around 500. I really don't think that the single plane M1 will lose that much streetable torque over the LD340 in this application.

[passing you]

Originally Posted by pcrmike

The stock maggies, yeah, but the new Iron Ram heads for the Magnum is a great piece. 300CFM is not too hard with smart work on those. :-) PCRMike

yeah those heads are bad assington for the buck, thet are around 250-60cfm out of the box.
stock magnums suck, j's destroy those things.
The RT's great as well, just wish they would cast them for shaft mount......

[pcrmike]

They are a clean sheet revamp (contradiction? Maybe) of the design of the Magnum heads with meatier port walls and deck, as well as beefier area between the valves, prone to "wrinkling" or puckering under heavy use and HP loads. Fair bit larger ports too. I am drooling over a set now, but have to CAD the ports before I start. Not mine, but will report back when I get his heads done. The original article I heard of these with said that untouched they were good for 260+ on the intake side if I recall correctly, able to outflow even many aftermarket blowtie heads. I have not tested to see, but from others and the info I have, I think a good, solid 300+ is going to be had. Exhaust looks promising too. We'll see. :-)PCRMike

[passing you]

good deal.

300+ is W series territory.
The iron rams are pretty different port wise from the magnums, which is a good thing. lol

[pcrmike]

Yup, but keep the dual quench chamber. The port setup is comparable, but a lot better. They should prove durable and HD. They can take I think it said .040 off the deck with no probs. Try THAT with a magnum. :-) PCRMike

[valiant64]

Yay! If you get Magnum-style heads you can switch to Shoverolet stud mount crap! lol jk

[TK]

Originally Posted by passing you

If it makes that lil it's cause it's only running on 6 cylinders.lol

You sure? J heads, stroker, thats a pretty good number at 5300rpm. What it does before or after that, is you decision. I don't think your HP numbers are going to be as high as you think, but the TQ numbers will be in the 1.2-1.5 LBS per Inch range.

I have a 390 and I doubt it makes 400HP. Hogged 302 heads, 9-1, voodoo 268/276 cam, streetmaster motor.

[pcrmike]

Magnum style head on the Iron Ram doesn't have the dogleg in the exhaust to compete with. The J is a great head, but it still has the dogleg. I have a set right now. My first set of "J"s. I am digging in them right now. I prefer them over the Magnums, frankly, as far as port goes, but definitely not chamber. I have found also, as a side note, that a polish of the chamber takes MOST of the risk of pucker away from the Magnums, but not all. You have to use other quench tricks on a J, like special "D" domes to create a similar effect. :-)PCRMike