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Post by dodgecharger1973 on Oct 1, 2009 11:57:34 GMT -5
i changed the engine in my car i put 400 motor instead of the 318 the 400 is rebuild with bigger valves2,08 1,74 stiffer valvesprings. Sig Erson cam hydro crankshaft is now 010 the pistons are 030 and the compression radio is 9,7 and the block is bored 030 i have a 750 holley carburator everything in the engine is new how many hp will i expect out of this engine
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Post by hotrodder on Oct 1, 2009 21:53:43 GMT -5
Gonna need actual cam spec's for one thing...
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Post by dodgecharger1973 on Oct 1, 2009 23:13:20 GMT -5
Dont remember the number on the cam it was chosen for street driving it is warm not hot
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Post by hotrodder on Oct 2, 2009 7:27:17 GMT -5
Dang, that will make it difficult to determine the amount of power output from that motor w/o the cam specs. As for a warm cam, I'd think of the Mopar "509" on a drag grind a warm cam, some would call it a hot cam, so... The cam I'm wanting to run (though no actual spec's as of yet) is a solid roller with a 255* to 270* duration @ .050" range, over .600" lift with 1.5 rockers, and a l/s of 114* this is a little bit of a nasty cam... Though with the right combo will make 600 - 650 hp.... Without a rough # on your cam, not sure who can tell you what it is, anyone can throw a number out there though. If you can find the paper work for it, or something and get some kind of a close #, then maybe....
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Post by canadian74se on Sept 19, 2010 1:12:08 GMT -5
Well I'm building a 400ci and you've got stock size 452 head valves, you didnt say head work. open chamber heads most likely, 9.7:1 compression is decent you'll start to get good quench in open chamber heads. you didn't say exhaust system but i'll assume headers along with aluminum dual plane intake (Edel RPM) and a stock 750cfm holley. Your ignition i don't know but most likely orange box mopar perf set up, stock distributor with who know degrees of advance set up inside. Cam is a mistery, I'll say and 440-6 cam would be a warm cam spec. I'd say MAX HP would be 405hp and max 430ft-tq. What I think you have is along the lines of a finely tuned 383ci mill that will pump out 385hp and about 405ft-tq.
If you had it on a dyno and tuned the carb/timing and ignition advance you would squeeze out easy 10 to 15hp & tq. I wouldn't credit yourself with anymore then 405 to 415hp. Unless you have somethign bigger then the 440-6 cam.
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Post by Nacho-RT74 on Sept 19, 2010 11:25:06 GMT -5
the valves diameter you gave is the stock one
what pistons you installed to get that CR ? or it is all in the heads ?
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Post by hotrodder on Sept 20, 2010 11:30:25 GMT -5
If running factory heads some good upgrades/work that can be done would be go to 2.14/1.81 stainless valves that are undercut, then port the heads to at least a gasket match.... Also, shave them to where they are true and not warped, plus add the bronze valve guides... Bunch of money, and a lil more you could get an aluminum set (could get a used set prob cheaper).... But that's a general guideline for the factory heads... As for pistons.. That's another discussion, fofl.
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,148
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Post by DynoDave on Sept 20, 2010 15:36:14 GMT -5
If running factory heads some good upgrades/work that can be done would be go to 2.14/1.81 stainless valves that are undercut, then port the heads to at least a gasket match.... Also, shave them to where they are true and not warped, plus add the bronze valve guides.... I like this Rx. As a matter of fact, so much, it's what I had done to the 915s I bought for my Chrysler. Can't wait to give 'em a whirl.
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Post by hotrodder on Sept 21, 2010 16:18:30 GMT -5
Instead of trying to rework a set of factory 452s, I got a set of stealth heads for the 440... Course, a set of factory heads don't really stand a chance against the way I got these done up, lol. I did think about redoing my factory 452 heads though... And I was going to use the above guide line to work the heads.. Course there would have been just a hair more done too though...
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Post by canadian74se on Sept 21, 2010 20:04:11 GMT -5
452 heads have hardened valve seats so you dont need to alter or change them unless they're damages or worn completely out. These heads are better then the 906 open chamber heads in higher lift rates. gasket matching on these heads don't do anything but if you port them out and do a good job you can run low 11's on a 440 with a good cam and good stall with 4.10 gears.
With out cam specs no one can tell you what HP you'll make. I still say 400hp tops with the info provided.
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