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Re: stock 400 build
[Re: bigblock4x4]
#835833
10/23/10 08:14 AM
10/23/10 08:14 AM
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Joined: Mar 2008
Posts: 390
kentucky
superbyrd
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 390
kentucky
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well,i don't read the "bible",i just go with what works. i have built 3 different 400's,using the closed chamber 516's for cheap and easy compression bump. you already have them. your 400 has pistons anywhere from .090 to .115 in the hole. the 452's will keep it at about 7.6 to 1. the 516's will bring it to 9 to 1.
current one i have, 66 coronet 2-door sedan(3700 lbs.)77 400,stock bottom end,no decking,uncut,unported 516's,comp XE268,performer RPM,750 holley VS carb,cheapie summit headers,2400 converter,8 3/4 with 3.55's. car runs on 255/60/15 BFG drag radials, have atleast 50 time slips between 12.94-13.10 in the quarter.do the math. i'm just saying,the 516's work, pretty sure thats not in the "mopar bible",but,the time slips don't lie.......
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Re: stock 400 build
[Re: Mirada440]
#835834
10/23/10 09:06 AM
10/23/10 09:06 AM
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Joined: Jan 2005
Posts: 1,647
IL
71383beep
top fuel
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top fuel
Joined: Jan 2005
Posts: 1,647
IL
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Quote:
The 516s are boat anchors, If read in the mopar bible you dont want to put the 516s on a 400... Ive looked into the 400s alot in the past because my brother and i were both doing builds like yours, Use the 452s and a 268 cam Aluminum intake and holley 750 DP, quick advance springs, headers or good manifolds and she will run hard.... 
closed chamber heads...boat anchors...right! 
I guess by your logic my boat anchor equip'd 383 would have been better off with the 906's it originally had on there which resulted in a fantastic CR ratio of 7.8:1. With those boat anchors I managed to pick up the CR to 9.2:1 with some minor decking...try doing that with an open chamber head...
To me I would not even waste time on an open chamber head...they are the true "boat anchors" in my book.
It is true the valve sizing and port design are not the best. that is why the 915 is more desirable, but the closed chambers make up for a lot of that...especially on 383/400's where piston choice is so poor.
Like anything they need some work to make do, bigger valves, porting, etc. but if your simply gonna do a straight out comparison by bolting on a set of 516's vs ANY open chamber head the closed chamber head will result in more compression = more power.
Wasn't 383HP running a set of 516's on him or his sons dart on a 400 that was running in the low 12's or something?
'73 GK6 Challenger Rallye - 340 4-Speed
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Re: stock 400 build
[Re: bigblock4x4]
#835835
10/23/10 09:18 AM
10/23/10 09:18 AM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
we here have been gettin TERRIBLE RESULTS with any comp but if you guys think the comp is better let me know why???i have never ran one,but there are 3 peope near by that have had there cams go flat in about 10 minutes,and they followed there break-in procedures to the letter,i was there,if it's good i'll use it,but i cant afford to tear down an engine every time they go flat.what did your car run like with that build?i got a 68 dart that should weigh somewhere in the neighborhood of 3000-3200 lbs
There seems to be a bad run for Comp users as of late, I would go with your gut on it .
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Re: stock 400 build
[Re: 71383beep]
#835836
10/23/10 12:29 PM
10/23/10 12:29 PM
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Joined: Dec 2008
Posts: 459
pana illinois
bigblock4x4
OP
mopar
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OP
mopar
Joined: Dec 2008
Posts: 459
pana illinois
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Quote:
Quote:
The 516s are boat anchors, If read in the mopar bible you dont want to put the 516s on a 400... Ive looked into the 400s alot in the past because my brother and i were both doing builds like yours, Use the 452s and a 268 cam Aluminum intake and holley 750 DP, quick advance springs, headers or good manifolds and she will run hard....
closed chamber heads...boat anchors...right!
I guess by your logic my boat anchor equip'd 383 would have been better off with the 906's it originally had on there which resulted in a fantastic CR ratio of 7.8:1. With those boat anchors I managed to pick up the CR to 9.2:1 with some minor decking...try doing that with an open chamber head...
To me I would not even waste time on an open chamber head...they are the true "boat anchors" in my book.
It is true the valve sizing and port design are not the best. that is why the 915 is more desirable, but the closed chambers make up for a lot of that...especially on 383/400's where piston choice is so poor.
Like anything they need some work to make do, bigger valves, porting, etc. but if your simply gonna do a straight out comparison by bolting on a set of 516's vs ANY open chamber head the closed chamber head will result in more compression = more power.
Wasn't 383HP running a set of 516's on him or his sons dart on a 400 that was running in the low 12's or something?
the 452's that i have are 80 cc's and have had some bowl work,if the 516's r better i'll use em,should i put the better exhaust valve n em first and have everthing checked?they are bone stock as they sit,and the milled 452's are ready to bolt on,thanks everyone for the responses
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Re: stock 400 build
[Re: gch]
#835840
10/23/10 04:41 PM
10/23/10 04:41 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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might checkout Dulcichs' porting articles in the Mopar Muscle archives. (3 part articles/excellent) & iirc there was some area on 516's that should not be touched (short side radius on the ex side?) that is std procedure to be reworked on all other iron OE heads but that they definitely can be made to flow. They do have a bad rep & might be if you touch that area they will flow worse which is maybe why.
live every 24 hour block of time like it's your last day on earth
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Re: stock 400 build
[Re: DaytonaTurbo]
#835846
10/23/10 11:37 PM
10/23/10 11:37 PM
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Joined: Dec 2008
Posts: 459
pana illinois
bigblock4x4
OP
mopar
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OP
mopar
Joined: Dec 2008
Posts: 459
pana illinois
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Quote:
I ran the lunati voodoo 60303 cam in a 70's low compression 440 and it ran quite well after I curved the distributor to suit it. The voodoo 60302 would make for a good running cam in your combo and being a 400 instead of a 440 you'd likely want to take it a notch down from what I ran .
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To me I would not even waste time on an open chamber head...they are the true "boat anchors" in my book.
Same here. His have supposedly already been cut so I would make an exception but in general  .
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the 452's that i have are 80 cc's and ...
Are you sure on the 80cc? To get 452's do to 80cc, I think you need to whack something like .100" off them. That much milling introduces some other issues as well...
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If you do your research has in mopar performance/direct connection race books...
FWIW I have one of the direct connection race books and there's so much crap info in there I threw it on the shelf and haven't looked at in in years.
they are for sure 80cc my friend checked em for me to make sure,might have to get some different length pushrods???they've been ported on some already that's the main reason i would like to use them,but i really am not that picky,it's not gonna make 500 hp either way,there's different ways to skin a cat,all you guys have been a big help and i apprciate it a lot
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