finally got some time to take on a new motor project, just bought a good 340 uncut '70 block and a 4" steel crank and OEM length H beams, (I normally like to run the 2" journal SBC rods with the smaller pins but the $ was right)

Anyway my first instinct for a 340 was to swap in the bottom end from my 318 mini stroker (6" alum rods on a 3.55 MP crank) to build a high revving ~370 incher and I got a nice victor 340 with the deal and I have a sweet little 255/260 @.050 .570-ish 0n 106 Harold Brookshire designed Lunati I got from Goldmember. That gives me the 4" I can build a 392" out of the 318 and drop in a tow rig (a 74 short wb fleetside dodge would be sweet).

The dilemma is if I go ahead and do the 414 (should clean up at .20 over to use common 4.06" rings ) I'm pretty much gonna have to reuse my bowl/VJ cleaned up/pinch relieved (but otherwise off the shelf) E-heads, so I'm thinking I'm gonna be limited to about 480-500 horse even with a near optimum cam. I'll probably go this way since I got a couple people that want to buy the 341" Roller motor anyway, with an oil cooler it'll make a sweet streetable A body motor.

What have you guys seen out of your 408-416's with stock E-heads?

New/bigger port heads are out right now, got a kid in college!!

I'd think that 500 hp would be about right. Those heads flow something in the 250 cfm range which should get you 500 hp with a decent shortblock.

Thanks Andy, yeah I've got a 427" sb Ford with heads that flow just over 280 and it made 511 but with a lot less cam than this one will need.

I gotta try to shift the torque up to a higher RPM, I know a few tricks to use on the Victor intake, my gut still says the 370" 3.55 stroke is a better fit for the short wheelbase Rocky but I've been itching to do another big arm SB Mopar since I first took a ride in Tom's F.A.S.T. Challenger.

I'd love to find a worked set of W5's under my workbench somewhere (like the old days).

I have a 410 in my Street Duster with E heads. No Dyno, But last weekend at the track (1/8 mile)It went 7.53 @ 91.8 Mph thats a stick car on Street DOT drag radial. Its all stock body...heater everything. I'm thinking 460-490 Hp??

That's moving in the 1/8th, nothing like a fast reliable 11 second smallblock

Thanks SW..Yes, thats what I always wanted a 11 sec street car..(Pump gas 9:7.1) I havent been to the 1/4 yet but I'm thinking 11.70-85 @ 113 mph

So what did the mini stroker 340 end up running in the Rocky?

I have a little ol E-headed small block stroker, to date, my best et is 11-teens at 119 mph and has 530-ish HP at the crank, 420-ish HP at the back tires...

I'm sure once Ryan or Brian chimes in, they will blow everyone out of the water with what they can do to them eddy heads...

Sounds like it will be a fun little machine. Here is a duster we freshed up. Used to have two 750's on a tunnel ram. It took quite a bit of convincing to get the customer to ditch the tunnel ram and go to a single 4, but once we did, it sure came alive!

562rwhp @ 7000rpm corrected if I remember correctly.

Dyno run...

http://www.youtube.com/watch?v=7TJA2ScKlig

First pass off the trailer in 4000ish feet of air.

http://www.youtube.com/watch?v=jxaOtKWZU4Q&feature=related

I believe he did get it into the 10.70's later that day. Now, with some SERIOUS Chassis tuning I expect it to go a bunch quicker yet!

-Kenny

Bobby,

My setup is a 70 340 block bored .020 for 4.06 and a cast 4" crank = 414 cubes. Been that way for about 8 years now!!!! 11.2 to one compression, ported E heads, 260 @.050 solid cam. Running low 11's at 121mph on pump 93 octane with full timing at 34 degrees.

Probably around 525 to 550 hp at the crank, using different calculators.

Have fun!

Kenny, That's with Stock unported Eheads?

Bad340fish, car is still in progress, I didn't trust the 998 trans to hold the high RPM's so it just came out and I was about to put in a fresh 904 right when this 340 4" deal came through. My buddy has an airstrip in his yard (nice, huh?) and he's let me do some T&T to sort the launch but so far no timed runs. Lenny seemed to think it hooked well on little 26.5 QTP. Now it hooks hard on the 295/65R15 M/T's I just bought, hike's 'em a bit but not as hairy as I thought (thankfully).

Larry, how ported are your heads?

The cam is I think going to be perfect for the stroker, if I put in in the 341 I figure I'd be shifting around 6800-7000. I hate to sell this shortblock, the little sucker revs like a banshee

Pull the kid out of college and get a better set of heads.

Sorry Bobby, I forgot about the whole stock port thing. haha. We hand ported these heads, however they still don't out flow my J heads that I have.

a little run down on this combo so it all makes a bit more sense...

Holley 950 HP
Victor 340 intake
In house hand ported Eddie's.
951 comp spring
13:1 (again, if I remember correctly.)
Comp solid roller
275 @ .050" intake
285 @ .050" exhaust
.658" intake
.661" exhaust
108 LSA

4" mopar forged crank
eagle stock length I beams
not sure what the pistons were.

-Kenny

Thanks, Kenny!

I was checking out your website, digging that 500 smallblock olds! I had a 10.5:1 455 loaded with Mondello goodies dropped into a 77 Seville, talk about a sleeper!!

I'm gonna take the block down to the shop tomorrow and start with getting the shortblock sorted. Maybe I can horse trade enough for better heads by the time I get done with it. The heads as they are a perfect match for the little motor, maybe I can sell the whole long block

Haha, Yeah, we like to do some odd ball combo's. Thanks for checkin' out the site! I am browsing through yours at the moment

Any way you can get a nice port job done on the heads? Or even tackle them yourself? They will make some pretty good power with a nice mild port.

-Kenny

Yeah, I might break out the old carbides but I figured they'ed need a 2.05 or even 2.08 to make them worth doing on a big motor, then again I know I could pick them up another 20-25 or so without a ton of work. The little I did to them they probably flow another 10-15 over ootb.

Just curious about guys that just bolted them right up OOTB on a 408, I'm sure there's a few out there.

I remember McCandless did an article on a 10.5:1 360 and got 500 out of it with just a little clean up, so I figured that's about what these are good for....regardless of the cubes.

Bobby,
I ported the heads myself. They are VERY open. I did a lot of work on them, but all of them in my garage with hand tools. I took out about 4 or 5 cc's of volume, if I remember correctly. I have a burrette, so I measured everything. All of my ports are within .2cc's of each other in volume and the shapes are all about the same.

Larry

Dropped the block, crank and rods to the shop, Machinist and I were both marvelling at seeing an uncut 340....not many of them left around any more. He does a lot of small block Mopars and has the deck plates too....A BIG shout out to my good buddy David Kluttz (Crabman173 here on moparts, who is a for real top notch engine builder hisself!) for turning me on to Hollis Page at www.HPEngines.net in Norwood, N.C.

I'm hoping it'll clean up at .020, nothing like a freshly machined big-bore small block, can't wait to get her back and put her on the stand.

I'm pretty much known as a Big Block guy but the truth be told I really love those 340's, mainly 'cause my little 4 speed Dart used to put the right regularly on all those allegedly nasty big blocks back in the day....of course those W2's (that cost me a FORTUNE back then....but were WORTH IT!) probably helped a bit too

I hope it works out well for you. Those Eddie's work pretty good all things considered. I think they can work better than most give them credit.

A larger valve would be nice, but I think if you just mildly hand port them you wont regret it. The 408 in the yellow Duster still had the 2.02's in them.

Even my W2's are still the 2.02" valve, and they work great! Even with the 4.25" stroke under them I gained 91rwhp just by bolting the W2's on over my J heads, which had 2.05" intakes. Yes the ET didn't change much, mainly because the car has 3.23 gears instead of the 5.13's last year, and the tight 9" converter opposed to the looser 8" converter last year. The car picked up 6 mph with the W2's and with the smaller valve.

-Kenny

Kenny, yeah I've always followed your stuff very closely, very cool and I'm hoping we can get to work together on a project some time, please keep me updated on the 500 SB olds, I first assumed that is had to be a 350 diesel block but the huge bores it has to be a 403....I always thought the 403 would be cool with a better casting that doesn't have the weak 'windowed' saddle webs. Isn't that block pretty weak or have you bolstered it somehow (I guess a girdle would help a ton). But I'm thinking there was one early year where the block had solid webs that was a lot stronger but rarer to find (you see I know more than just mopars ) The 350 diesel block is a hoss and still has a decent 4.07" (IIRC) correctly but I didn't think it could go to 500". I'm guessing you run a 455" 4.25" crank with an offset grind
to run ???? journal/length rod?
I re-tit;ed the post to cast a bigger net and catch the bracket racer results too, I didn't mean to infer I only wanted dyno data, I know most guys just run em straight off the stand.

My heads have been ported by a good machine but still have the 2.02 valves. I do have a pretty large roller cam and 422 cubic inch 318 engine. Best of 10.91 all steel car with heater , wipers , and a banging stero. I love a stroker small block.

Bobby, to give you a quick run down on the SBO, It is a weak looking 403 block. But you should see the girdle we are making for it. LOL. It is a halo girdle but will connect to the block as well. The machining bill is just growin'! hahaha. This is a project we have been picking away at. maybe we will finish it off for next season, and put it into our brown four door 1978 cutlass cruiser wagon. She's a Beaut.

Joe, what does your car weigh in at? I forget. It is tubbed and ladder bar'd right? She's scooting along nicely!

-Kenny

Hey Kenny, it weighed in at 3400 lbs with me in it at Atco a couple of years ago. It does have ladder bars and tubs , but full interior. Thanks, Joe

Yeah, I thought it was somewhere around there. I knew it wasn't really light!

-Kenny

I guess another way to look at my combo is if I can try to use up the heads I got in as few RPM as possible, I like the idea of running a 106 centerline and keeping the peak RPM down, the Victor (I'm almost done porting) will take some grunt offthe bottom and make a bit more upstairs (above 4000) so the 4000-6200 should still be strong.

I know there's a lot more in a full ported set but I've gone low 11's with big blocks in much heavier cars with heads that I bet didn't flow as well (or rev as fast) as this 414 will.

You will be suprised by the torque of a small stroker. With a decent port job and the right cam it will pull like a big block and rev like a small block. No downside for the setup as I see it. Good luck.

Oh yeah, I do know strokers very well

Of course I've built a lot more BB ones but I've done several small blocks too. The issue is really how far I can push the stock Eddies before they lay down, the consensus seems to be about 500hp (which is PLENTY for this thing).

This one is a 427" windsor (4.04" x 4.17") that made 511hp with a Hydraulic flat tappet

That dude would be fast with a hot briggs and stratton. 500 hp in that car will be a heck of a ride. But really You can make at least 500 hp with stock Eddie heads. I personally like the heads and even stock they are much better than the old cast heads.

I've been 10.30 @ 131.10 mph My Dart wieghs 3120 with me aboard.

360 w/4.07 bore
"0" decked block
13.5 comp
Solid roller .670 int/exh
Eddie Magnum heads, no port work...just cleaned up the castings.

M-1
950 ultra HP
FBO recurved dist
1 7/8 headers
Hemi 4 speed.

The car has more in it, i just have to fine tune it a bit more.

Seems there's a correlation between higher compression and higher (than othwerwise expected) horsepower out of these heads. My view is If you can't run pump gas abouve around 10.75:1 or so anyway you might as well jack the CR as high as it is practical...I think I'll shoot for 12:1 which I think is where a 414 will come up zero deck with a no dish Flat top and a 64cc head.

I have a 360 stock crank, stock rods, kb flat top pistons, e-heads ported by Hughes with approximately 11.7-1 compression and it runs great on 93 octane. 11.21 at 121mph

I have a 418 in my Challenger that weighs 3720 race weight. Previously it has been as quick as 6.92 and 10.98 @ 120.5, but about 2 weeks ago I ran 6.89 on the brakes. It would have been 6.88 @ around 98.5 mph. It has ported Edelbrocks, Victor intake, 950HP carb, cam is 262in 268ex 110 centerline with 11.55 compression and all I have ever run is pump 93 octane.

I've got a pump gas 410 stroker that ran 6.89 @ 97.75 in Dallas a couple weeks ago. Engine dyno says 535hp @ 6200rpm. Valve springs have been changed but thats all that has been done to the Edelbrock heads. Engine is in a 74 Duster.

I'm very impressed with the numbers guys are laying down with the E-heads!

I just want to put a solid reliable combo but I need to shift as much power upstairs (take torque off the bottom)

The combo will be:

4.06" x 4" = 414
6.123 H beam rods
Flat top (JE's or Diamonds), should come up right at 12:1 for Zero deck
255/260 @.050 .568/576 Solid Flat tappet, 106/106
Eddie heads (the ones I have VJ/Bowl blend/pushrop pinch to ~1.02" (thanks for
the tip, Ryanj!)
1 5/8" A body headers (too small but they fit perfectly)
830 annular holley (was a tad too big for the 341)
Ported 340 Victor

Trans 904 with a 3500 stall T/A

Rear 8 3/4 W 4.56's, 295/65R15 M/T Drag radials

Weight right around 3000 w/me (245) in it.

going 1/8th mile, probably not enough gear for the 1/4 (like I need 4.56's now anyway )

I think this thing is going to work well for you!

-Kenny

yeah the little 341 was a lot of fun but once I added the roll cage and rear (thanks Lenny ) she wound up being a little heavier than I first planned, the 414 will have an easier time of it but I hope it doesn't flip me over on the launch.

Our build up had basically just polished heads, a flat tappet cam, crosswind intake and a 650 demon carb. I wasn't too happy with the numbers, it was a 11+ CR engine run on pump gas and made 468 hp at 6000 rpm and 490 ft-lb of tq. I think there was something wrong with the combo, other carb, intake and headers, and I believe it would have made 500 hp.

jyrki,

was that a stroker motor? if so i think a bigger carb would have helped the HP up top, especially running a dual plane intake.

My Machinint thinks 480hp would be no problem and maybe 500 with no more than what's already done to the E-heads. I just spent 3 hours finishing up the porting of the Victor Intake, I think it's going to work real well.

I'd love to be able to run a bigger tube header on this motor but it doesn't look like that's in the cards right now.

I'll keep my eye out for a set of W5's in the mean time, maybe I'll have enough $$$ after I sell my wicked little 341.

I have a set of brand new in the box W5's collecting dust. Not sure what I am going to do with them yet. There is a local guy here thinking of buy them off me. I have the castings, crane gold 1.5's, hold downs, and a 2-4 tunnel ram

-Kenny

Jumping on late, but it seems my combo runs right where it should, middle of the pact with the others posted...
3400lb. Dodge Demon 3.91 gears, 28x9" slicks, 904W, PTC 3K stall, SS springs and snubber.
340 block, .030" over (4.07"), stock caps studs.
MP 4" crank, Eagle SIR rods, dished Diamond pistons.
1800gr bobweight, pistons .005" above deck,1009gskt.
OOTB Eddys, Comp 985 spring upgrade, Crane 1.5rkrs.
Ultradyne ft solid 259/263*@.050, .590/.587",110LSA.
1.75" Hooker SC headers, M1 SP intake, 750 DP carb.

Ran 7.14@96 and 11.21@119 on pump gas in the heat.
Shift at 6000, rpm chip on 6500. Revved as high a 7000 on shifts with no real advantage, tried carbs up to 950 and no benefit there either. Also learned that a Performer RPM AirGap is no slouch on such a motor, same ET and MPH! Very forgiving and robust combos these 4" motors are! I am replacing the above combo with a 13.1 IndyBrock roller 416 (600+hp???) now since I have ladder-barred the Demon now and taken it off the street. The pump gas 416 is getting ported heads, a VooDoo street roller and the RPM AG intake and going in a '79 T&C (LeBaron) station wagon for a sleeper project. Same wide ratio 904, 3000 stall PTC, and 4.10 gears this time... Wish me luck!!! RB

Bighead,

Thanks! that's pretty close to what I'll have and tells me (with 400 pounds less weight and having a little more more stall and gear)I should be able to put this thing safely in the 6.90-6.99 range....which is quick enough for me to have some fun with.

I also like the anvil like reliability a moderately low (6500 is pretty easy on even a 4" arm smallblock) RPM big incher will make

I've got a 70 340 30over factory 3.31 stroke.kb slugs {eagal sir rods}.627 roller cam and mild port eheads.shift at 6500rpm been 6.84 ets at 98mph 1/8 mile.It's a 67 barracuda 3050 with me in it. Cheers

My 416 with eddy heads went 11.02 @122 and 1.48 60 foot. best of 6.93 in the eighth @ Roxboro. Good little motor, I wouldn't mind another one!11.3 to 1 compression,ran fine on pump gas .

Yes, it was a stroker. We tried a bigger carb, but the engine did not respond. I think the combo just wasn't right, and like I said before, I'm pretty sure that with 1 3/4- 1 7/8 primaries, a victor 340 intake and a 750 carb the numbers would have been better.

How big was the cam and what was the spread and ICL?

Victor is a real good intake ported...not the best out of the box, needs about 2-3 hours of plenum work and fixing the bad port match but after that it's a real screamer.

I donät remeber the specs anymore, if I remember corrrectly it was 255-260 degrees at .050" and sbout 0.57" lift. It was a custom cam from Scott Brown, so I assume it was a wide LSA, and installed according to the card.

I tend to prefer a tighter lobe spread, particularly on a port limited combination.

My 9to1 408 with stock magnum eddy heads ran a best of 10.34 @ 125 with 1.40 60 foot on pump gas, Great running motor

we figure around 2400lbs

My Barracuda “street” car runs a 410 with Eddy heads. It is a pump gas motor, runs 10.90 @ 121 (see sig). Stage 2 port from RyanJ, 10.8:1 comp, 750dp, Air-gap intake, small solid roller (248/254 duration, .576/.582 lift IIRC) 727, 8” vert, 8 ¾ w/ 4.10 gear, 3200#’s.

A very street friendly combo....well, for me anyway .

Flyfish, that's really impressive performance, especially knowing you're running an air gap intake in the 10's! Judging from your 1/8th vs 1/4 mile MPH My guess is you probably got some more top end HP left in it.

Streetwize, These links have the basic specs of qwkmopardan's stroker SB cars. Good running, simple combos. Fun reading.

https://board.moparts.org/ubbthreads/show...rue#Post5456720

https://board.moparts.org/ubbthreads/show...rue#Post6044448

Brent,

Thanks for the links!

I think the combo I got ought to run strong, what I want to do is shift some of the torque upstairs so the little 86" WB Rocky doesn't get too squirrely.

Interesting Dan also mentions the need to port the victor, Victor 340's as cast have some particularly thick (well actually REALLY THICK ) runner dividers into the plenum...there's power there if you know how to contour them to enhance the flow.

Looks like I'll have right at 11.8:1 so I think i'm safe with the conservative 480 horse estimate. The victor 340 is coming out nice, I'm gonna try it with a 2" HVH spacer.

Any more real world ET/mph's with stock eddies on a 408-416?

Just decided to send my 414 E-heads to Shady Dell

Using the old 4.1 cfm per horse per cylinder, another 30cfm (Ryan's stage 2 porting) should give the motor another 55 or so HP and another 500 or so of Rev cieling.

What concerned me was being able to run the 1/4 mile without the motor gasping for air past 1000 feet or so, I figured the cam I'm running with unported heads would peak around 5600 and the motor would start laying down around 6000-6100. The Extra cfm should get me to ~6500-6600 and let me pull the 4.56/29.5" gears/tires up a bit higher.

What kind of RPM are you solid flat tappet bracket race guys shifting at? I've always found when a stroker is built right and has the right cam you can short shift it ran nearly the same ET's, ain't torque great?

I know of a low budget 408 with stock edelbrock heads that runs mid twelves at 108-109 with 3:55's and low twelves at 110+ with 3:91's. Our track is 2800 ft and they race during the day when it's hot so the corrected altitude goes much higher.

The engine is in a first gen. barracuda street car with full 2-1/2" exhaust. The engine is about 10:1 and has a performer rpm intake, an old swap meet special 750 afb, stock rockers, a moderate hydrallic camshaft, homemade headers, basically a very mild engine.

Neil,

yeah, that's what i mean about torque, granny shift it, bad air, street gears, heck leave it in "d"...the motor just don't care.

this is more of a bracket motor for my little Rocky...I'm aiming to go 6.90's in the 1/8th and high 10's in the quarter so i gotta turn the RPM wick up just a tad. Of course I could go down to a 3.55 gear and still run 7.30's/11.50's with the heads as they are .....naah! too easy!!

my feelin eddy head will run w a w2 till about 600+lift then w2 has little more

AWB...yeah that's about right (.500-.550) by my my measure too. My cam is only .570 lift (.552 w/lash)

Ryan's Stage 2 job will be perfect for what I need (the E's are also a little better under the curve) to get me safely in the 5 zone....plus give the motor the extra wind-out RPM on the top end to run my gears (4.56) in the quarter.

hey street, my 340 stroked w flat top pistons 10.5 to 1comp pump gas w a bullet flat tappet cam 255/255 580lift cam was 10.80's and still had more in a 3200lb dart..with some port worked eddy's..3500 stall ati conv 28x10 cal trac car.the motor on ray bartons site(small block) is my actual motor..b 4 i went w my new stuff