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View Poll Results: what hp will it make? | |||
400-425 | 3 | 50.00% | |
425-450 | 1 | 16.67% | |
450-475 | 1 | 16.67% | |
475+ | 1 | 16.67% | |
Voters: 6. You may not vote on this poll |
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02-26-2008, 11:36 PM | #1 |
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question on horsepower amount
i am about to start building a 408 to put in my mustang. i am running a 4.0 crank, 6.2 rods, keith black pistons that have two valve reliefs that are 6.5cc. i am looking at getting edelbrock aluminum heads from summit that have 2.05 1.60 valves with a 60cc combustion chamber. put it in this formula thing and it will be right at 11.9:1-12:1 compression ratio. so my questions with a healthy cam choice good for the road what kind of power do you think i will be making?
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02-27-2008, 12:06 AM | #2 |
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There's a lot of variables that come into play here that make accurately predicting power output a pretty tall order (typically always is).
Cam choice will be a big factor ... carb or efi will make a difference, as will the exhaust. Don't forget that the only numbers that really matter are on the time slip not the dyno sheet
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02-27-2008, 12:39 AM | #3 |
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oh i know. streetable too. i am prob going to be looking for a cam with high 500s low 600s for lift, will stay efi with i am figureing 42s just to not put a strain on a 255 pump. maybe a 100 shot just for the track later down the road
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02-27-2008, 07:12 AM | #4 |
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Get a dished piston if you want to run pump-gas. Also, use a spider-style intake (converted to EFI) with a throttle-body/elbow on top. With the right cam, and a little work on those Victor Jr. heads, it could make well over 500hp. On pump gas.
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02-27-2008, 11:41 AM | #5 |
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well i have an edelbrock performer upper from the 302 and i just have to get a base for the 351
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02-27-2008, 02:10 PM | #6 |
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A Performer Intake?! On a 408?!?
then you need to add another choice: 350-375hp. Ditch the Performer. It won't perform well in that application.
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02-27-2008, 03:02 PM | #7 | |
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Quote:
So far 1sicklx and Matt are dead on! HP prediction: Too many variables to make a prediction, But the way youre headed it would be fun in a tow truck or daily driven 4X4. Camshaft: There is way more to a cam than lift and duration, Lift and duration are a by-product of timing events and lobes chosen. A good cylinder head needs good clean charge of fresh air, This means little to no overlap and the use of faster ramps. Advertised duration and duration @ .050 gives you an idea of how fast or slow a ramp is as does LSA. Cubic inches, Total combo and desired operating parameters dictate the cam needed. Optimal for a "Streetable" application is a wide Tq curve, This means you have to be careful picking your parts or the camshaft will have to crutch a poorly chosen combo. Streetability: This is like asking opinions because everyones perception of "streetable" is different, Mine is if it will idle its streetable. Intake: Dale has my old Probe/CHP EFI Spyder and I think he is looking to sell it, It is new and is not a Chinese knock-off(original Eddy Vic Jr.).
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02-28-2008, 04:19 PM | #8 | |
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Quote:
i know all of this i aint retarted. my intake has bigger ports on it than the heads do. i am gettin the edelbrock sr. heads with the 210cc intake runners and 205 160 valves. and a 60cc combustion chamber. i am gonna call comp cams and get them to pick me a cam for my set up i am figureing a mild cam for it will be around high 500s to low 600s for lift with like 276 and 280 duration with like a 112 lsa or something. i am also going to be running 36s or 42s. not sure but gonna find out. i am looking for around 450. i know it could be way more or way less. i am just trying to put a parts list together that "should" work to make what i want.
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02-29-2008, 12:10 AM | #9 | |
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Quote:
One major problem though with the intake, Its not really the size of the port but the length that hurts you. The intake will be a major bottleneck if your looking to make power above 4500rpm. The heads are not Victors but more than likely Victor Jrs, Eddelbrock Victor cylinder heads are a 15* head. They require special pistons and Victor specific shaft rockers not to mention they come with larger intake valves and ports than what you posted. Anything short of a converted Vic jr or Super Vic intake would be a waste of time on a Victor headed engine.
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02-27-2008, 03:44 PM | #10 | |
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Quote:
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