Re: 400 stroker
[Re: DusterKid]
#2386836
10/13/17 01:15 PM
10/13/17 01:15 PM
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Joined: Jan 2003
Posts: 74,962 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,962
U.S.S.A.
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Bigger cubes the lower the peak RPM so if you want a 6000/6500 rpm motor then I myself would probably build a 470 considering the flow of your heads, maybe go 500ish if you think you might put a better head on down the road?
Studs, alum caps ... or Ductile iron ... bush the lifter bores if you are going with a mechanical flat tappet and thinking of running a cam that will take advantage of the .904 lifter size, does Hughes still sell HTL cam ?
running up my post count some more .
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Re: 400 stroker
[Re: DusterKid]
#2386842
10/13/17 01:26 PM
10/13/17 01:26 PM
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Joined: Jan 2012
Posts: 2,631 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,631
Stuttgart, Arkansas
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I think you are asking a lot from a pump gas, flat tappet. Go 512. My buddy's Dart (weights are close) can barely do what you are asking with unported B-1 B/S's, more compression and a light duty roller cam. You will have to have a well working combo.
2011 Drag Pak Challenger
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Re: 400 stroker
[Re: DusterKid]
#2386880
10/13/17 02:22 PM
10/13/17 02:22 PM
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Joined: Aug 2003
Posts: 43,112 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,112
Bend,OR USA
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Have your block sonic tested before doing any machine work on it Look for at least .140 cylinder wall thickness AFTER boring on both the major and minor thrust surfaces, cam side and motor mount sides If it tests good, most do, then look at either using studs with either aluminum or ductile iron main caps, NOT STEEL (I like and use Ductile iron but I don't think you can buy them now ) The advantage of increasing the stroke is to increase the bottom end torque As far as your goals on limiting the RPM the cam, headers, intake and carbs., converter, tranny gear ratios and rear gear ratio and tire size will dictate where the motor wants to be shifted to go as fast as it can Maybe you should shoot for between 6000 and 7000 RPM shifting and crossing the 1/4 mile at My first 400 pump gas stroker motor(511 C.I. with a low deck Eddy six pack intake and carbs) made peak torque at 4500 RPM and peak HP at 5500 RPM on the dyno and it ended up liking to be shifted above 7000 RPM at the track to go as fast as it could Last thing do not waste your money on filling the block If your current block is not good enough to use as is, find a better one
Last edited by Cab_Burge; 10/13/17 02:26 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 400 stroker
[Re: DusterKid]
#2386896
10/13/17 03:04 PM
10/13/17 03:04 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Crunching some numbers with the spec you gave of 287cfm heads@.600, 10.5:1 and 3200lbs race weight, a 470 would probably not squeeze the 630ish hp needed to run 6.30's-1/8th and 10.0's in the 1/4 with a solid FT cam With 630hp-4.10's and a 30" tyre it should trap around 6150+slip, 4.30's = 6450+. A bigger motor for more torque to help with the hit with say 4.10's (for low rpm) would be better but your heads could then be a bit restrictive and top end power could dwindle before time, so really the issue is its not enough head as I see it to reach your goals with a 470 at least. Now if you ran a roller cam and got some more out of those heads?.
One combo that I can quote you from the track if it helps is> 440ci, 12.7:1CR, 320cfm heads, .590/312 purple solid, 3150 r/weight, 10.1's @131 = 600hp, 4.56 w/31" tyre 5000 stall, shift at 6400, trapped at 6800
Last edited by rb446; 10/13/17 03:12 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: 400 stroker
[Re: AndyF]
#2386939
10/13/17 04:52 PM
10/13/17 04:52 PM
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Joined: Jan 2005
Posts: 1,772 Keymar, MD
DusterKid
OP
top fuel
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OP
top fuel
Joined: Jan 2005
Posts: 1,772
Keymar, MD
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My pump gas 470 makes over 700 hp running unleaded premium. That is why I suggested he switch to the TF heads. The Wilson ported intake that I used on my 470 is for sale in the race section so all a guy needs to do is build a 470 short block with flat top pistons then buy 240 heads from Summit and add the intake that I have for sale. That will give you 700 hp which should run low 10's or high 9's depending on how well the car is set up. Was any work done to the TF 240 heads or they pretty much OOTB?
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Re: 400 stroker
[Re: DusterKid]
#2387023
10/13/17 07:41 PM
10/13/17 07:41 PM
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Joined: Jan 2003
Posts: 9,985 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
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IMHO go 512 with better heads, if possible. A fully ported set of Indy SR heads would be a minimum ( about 340 cfm flow at .700). The reason for the much better heads is that with less flow, the whole car combo will need to be spot on to reach your goal. What altitude do you race at?
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 400 stroker
[Re: AndyF]
#2387034
10/13/17 08:04 PM
10/13/17 08:04 PM
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Joined: May 2005
Posts: 1,030 ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,030
ohio
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My pump gas 470 makes over 700 hp running unleaded premium. That is why I suggested he switch to the TF heads. The Wilson ported intake that I used on my 470 is for sale in the race section so all a guy needs to do is build a 470 short block with flat top pistons then buy 240 heads from Summit and add the intake that I have for sale. That will give you 700 hp which should run low 10's or high 9's depending on how well the car is set up. Andy is that intake limited to just the trick flow heads or can they be used with something else
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it. 67 Belvedere that worked it's way in the 10's
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Re: 400 stroker
[Re: 67mprfan]
#2387106
10/13/17 10:40 PM
10/13/17 10:40 PM
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Joined: Jan 2003
Posts: 30,992 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 30,992
Oregon
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My pump gas 470 makes over 700 hp running unleaded premium. That is why I suggested he switch to the TF heads. The Wilson ported intake that I used on my 470 is for sale in the race section so all a guy needs to do is build a 470 short block with flat top pistons then buy 240 heads from Summit and add the intake that I have for sale. That will give you 700 hp which should run low 10's or high 9's depending on how well the car is set up. Andy is that intake limited to just the trick flow heads or can they be used with something else That intake would work with any standard port cylinder head. It will work better if the heads have been ported by someone who knows what they are doing.
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Re: 400 stroker
[Re: DusterKid]
#2387164
10/14/17 01:19 AM
10/14/17 01:19 AM
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Joined: May 2004
Posts: 12,383 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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Will be building my 1st mopar stroker engine this winter and would like some input. Will be using a 400 block, 440 source heads that have been reworked and flow:
Head flow numbers 100 lift 77cfm 200lift 161cfm 300lift 230cfm 400lift 271cfm 500lift 283cfm 600lift 287cfm 700lift 285cfm
Engine will be going in a 3200 lb car with driver and hoping to get to the 6.2s-6.4s range in the 1/8. Not looking to turn a bunch of rpm, would like to shift around 6000 and not twist it over 6500. Looking to be around 10.5:1 compression. For the moment will probably stay with a mechanical flat tappet camshaft. My questions are:
What are the pro/cons of the 512/500/470 kits? Obviously more cubic, but would one be better suited than the other for what I'm trying to do?
As far as block prep: Should the block be atleast partial filled? Do I need just main studs or main studs and a girdle or go ahead and get 440 source main caps with studs and girdle?
Any other helpful tips and suggestions are appreciated. Thanks. Going to need better heads than that to go 6.2 at that weight.. 512 with light weight crank option is best....Definitively use a girdle, and no need for any fill.
Last edited by Dragula; 10/14/17 01:24 AM.
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Re: 400 stroker
[Re: AndyF]
#2387372
10/14/17 03:41 PM
10/14/17 03:41 PM
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Joined: Jan 2003
Posts: 11,706 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,706
Portage,michigan
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My pump gas 470 makes over 700 hp running unleaded premium. That is why I suggested he switch to the TF heads. The Wilson ported intake that I used on my 470 is for sale in the race section so all a guy needs to do is build a 470 short block with flat top pistons then buy 240 heads from Summit and add the intake that I have for sale. That will give you 700 hp which should run low 10's or high 9's depending on how well the car is set up. If its making a " track proven" 700, a 3200 pound car will run well down in the 9's easily. My old w5 motor " made" 708 on a dyno and backed that up running low 9.60's at 140 in good air on 002/003 leafs and cheap shocks. So nothing trick about the car setup at all.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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