HP 440 RATEING ... How much power will i have ?

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1994rm250

1994rm250

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Okay guys i just bought a a 1975 440.. not sure wat heads are on it ,, but i would like to know how much power do you think i will be making ?

Voodoo Camshafts
Camshaft & Lifter Kit
Lift: .513''/.533''
Duration: 276°/284°
RPM Range: 2200-6400

10:1 compersion

edelbrock Intake CH4B

holley 750 double pumper

I havent taken my heads off my motor yet b/c i just bought it not sure if its stock pistons or forged..

Thank you guys --angelo
 
1994rm250 said:
Like 350HP ? mabe ?
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Easily closer to 400, but why that intake choice. The Performer RPM is a much better intake IMO and I'd top her off with at least an 850 cfm and don't forget a good roller rocker kit from Crane or Hughes. But now the cork in the system are the iron heads which will either have to be ported or go with a set of 440 source or Edelbrock aluminums. Now you're over 500 HP.

Almost forgot, that's a low comp. 440 (8to1) that you've got so plan on new pistons anyway to get the compression to 10 - 10.5 to 1.

Terry
 
I think the the cam, intake, and carb choice is good.

Are you going to rebuild the engine? Or leave the bottom end alone?

Even with low comperssion you'll break the 350hp mark. With more comp, some big valves and a little port work 400+ should be no problem.
 
yeh im not looking to do machine work .. but im useing that intake for now b/c i got it with the Motor .. and the carb ...

I wanna get at least 380 400 hp

i have to check the comp on the motor I kno its not stock !!! it does have manley head bolts cam intake oil pan ectttt..

its got springs and reatainers its gotta have head work !

Thanks angelo
 
You might get it with that intake. Probably not, but you might. It's a 7.8:1 440 that you are overcamming. You may need to have the heads machined to run the required valve springs if it runs a single with dampner now. Might also need new retainers for the double springs if stockcers were used. I would go down one step on the cam, and run the Edelbrock RPM with that combo. The CH4B is not a performance manifold. Just lighter.
 
Then do what you feel like. So long as you're happy, what we say means nothing...lol. However, you should know you're building a mismatch, and it will be down on power and have mediocre overall performance. Have fun :D
 
okay i did take the heads and oil pan off the motor has forged pistons and 440-6 pack rods #p4120516.... I am going to get the M1 intake i hear that is one of the best intakes . .
 
wow angelo i hate you for getting such a good deal on this thing.
 
How far down in the bores are the pistons? How many valve reliefs on the pistons?
 
the piston skirts are the V'd and the botten of the side skirt hangs off the bottem of the bore about 3/4 of a inch mabe a little more I am trying to upload these dam pictures on my computer
 
1994rm250 said:
the piston skirts are the V'd and the botten of the side skirt hangs off the bottem of the bore about 3/4 of a inch mabe a little more I am trying to upload these dam pictures on my computer
Click to expand...

I think (sometimes) what Moper meant was when the piston is at top dead center how far down in the bore (below deck) is the piston sitting, eg. .125" or 1/8". This will give an idea what the approx. comp. ratio is for that engine. Also are there any valve relief notches in the tops of the pistons if so how many 2 or 4 notches.

Terry
 
the pistons are flat with like a a Heat plug in the middle or some thin.... it prob sits lik 1/8" from the top i will get muserments. tho
 
ok, so they are the flat top battleships... The bad news, you still have an 8:1 compression 440, and the rods are the heaviest made, and no stronger than std LYs. The up side, someone's been in there and you should have at least a solid set of bearing clearances. I maintain the smaller cam, and the MP single will hurt you, and the dual plane isnt anything other than stock. I'd run either a Holley Street Dominator, or an RPM.
 
should i just see if i can get aluminum heads ?

i got one head number it is 2780915-8 any help on this ?


2780915 440HP 1967 Int 2.08 Exh 1.74 is this correct ?
 
The aluminums have the same chamber size as your 915s. If your engine (or the one the heads came from) was a '67 HP engine, then they are 2.08/1.74. If the engine was a standard 440 (as in no HP stamped by the factory on the ID pad near the driver's side front of the valley area) then the heads came as 2.08/1.65 exh. Not all 915s are the 1.74 exh valve. Good heads, by the way. The problem is the pistons.
 
With The 915's And The 8-1 Piston Will Make It Aprox 8.8-1comp, Then Mill Heads .060 [if Not Milled Already] That Will Bump It Up 1 Point In Comp To 9.8 Or So Then Run The Combo You Have Should Work Ok, Could Gasket Match Intake To Match Head For A Little Better Flow--ch4b Is A Decent Intake But A Torker Or Streetmaster Or Rpm Would Be A Better Choice For More Perf, If You Are Going To Rebuild Motor Then Ditch The 6-pak Rods But If Its Already Together Then Run It Like It Is Will Be Fine For Street Motor, And Alot Of It [the Performance] Will Vary By Weight Of Car -gearing-convertor-suspension Mods-headers-carb Etc, Just Research And Weigh Out Your Options For What You Have Or Can Afford,and Ask Questions And Opinions From People Who Have Been There -done It -improved Upon It And Finally Get Er Done.........just My Nickel's Worth.........there Are 100 Different Ways To Do Different Recipes So Figure Out What You Want To Do With What You Have Or Can Get And Do It Your Way And When In Doubt Ask For Help Or Direction , Main Thing Is To Have A Buttload Of Fun Doing It
 
yeh thanks for you help guys yeh the motor and the bottem end i was no planing on taking apart thats y i got a built motor already ,,, hopefull te heads are 915's with 1.74 exhaust.... if not i got a extra pair of 1967 383 915 heads but the motor was a 2bbl ?


What size CC are the 915's ?
 
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