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Old 01-09-2008, 02:01 PM
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Another horsepower Estimate :D

This is what i have....im hoping for 450 hp IN a 427 Tall deck chevy

Summit cam- 218int. 228exh. at .50 lift Advertised at 276 286 .500 lift RPM range 2200 to 4500.

Procomp Alumnium Heads- 320cc intake runners 115cc combustion chamber. 2.25int. / 1.88exh.

FLOW DATA @ 28" H20

.500 lift - 340 int. 229 exh.

Aftermarket clevite pistons .040 over flat top with 1 valve relief, not sure on cc.

Edelbrock Rpm Air-gap

Edelbrock 750 mech carb

dynomaxx headers

Comp Cams street roller rockers

Any idea where ill be at?

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Old 01-09-2008, 02:08 PM
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I am going to give the same advice I give everyone...download Engine Analyzer pro V3.5 free at www.performancetrends.com click on downloads at the top of the page and use it free for ten days. You don't even have to give them any personal information. Plug in your specs and calculate the horsepower then hit the analyze button and it will tell you how to make it better.

They probably even have your heads and cam in their library so you can just select them and it will plug in all the info.
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Old 01-09-2008, 02:09 PM
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I shall check that out, thank you.
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Old 01-09-2008, 02:13 PM
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Thats an awful big head for such a small cam.
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Old 01-09-2008, 02:19 PM
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Well i d/l the program but there is not 427 tall deck, so how will i know if the numbers are going to be correct or even close? The cam is a close match to a extreme 4x4 cam, which im puting this into a truck so i thought it would be alright.
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Old 01-09-2008, 02:31 PM
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The bore and stroke information is the same, it shouldn't matter what deck height you are dealing with. If you want you could subtract 2% for the extra rotating mass.

Just select the BBC example even though it is a GenV and enter the 3.766 stroke x 4.000 bore and you should have your shortblock.
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Old 01-09-2008, 02:32 PM
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The bore and stroke information is the same, it shouldn't matter what deck height you are dealing with. If you want you could subtract 2% for the extra rotating mass.

Just select the BBC example even though it is a GenV and enter the 3.766 stroke x 4.000 bore and you should have your shortblock.
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Old 01-09-2008, 02:32 PM
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The bore and stroke information is the same, it shouldn't matter what deck height you are dealing with. If you want you could subtract 2% for the extra rotating mass.

Just select the BBC example even though it is a GenV and enter the 3.766 stroke x 4.000 bore and you should have your shortblock.
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Old 01-09-2008, 02:44 PM
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i cant really ifn anything on there that matches mine lol, only thing is the block..thats about it.
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Old 01-09-2008, 03:11 PM
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Sorry about all the posts my computer was hooey. I meant to say 3.766 x 4.250. You should be able to enter all the information manually. And they have a library down at the bottom where it says "retrieve from library" they should have all the crane and comp cams plus all the stock BBC stuff, then the same thing for the heads, you can just select a similar style intake to what you have, play with it for awhile and you should be able to get pretty close.

I got a shipment from summit today so I am headed for the garage but I will be on later if you need anything.

Last edited by Double_v23; 01-10-2008 at 01:10 PM.
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Old 01-09-2008, 03:14 PM
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Thanks for info so far enjoy your shipment
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Old 01-09-2008, 07:46 PM
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Whew! Got some things figured out, gotta love new parts...it might as well be christmas. Looks like the aluminum timing cover I got wont fit over the timing gear drive.
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Old 01-09-2008, 07:50 PM
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Gotta love the Delivery guy when thats being dropped off hehe. Well i put (the best i could) all the specs into that program, it tells me i will be around 445 hp and 505 tq so im not sure if this sounds right, but it sounds pretty good to me
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Old 01-09-2008, 08:09 PM
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That is not too bad, Did you try entering in a bigger cam? It seems that you have plenty of duration but not a lot of lift. I have the same engine, but stroked to 496 and it runs 284/295 duration and .660/.660 lift. It idles like a kitten and just sits there until you stab it then it is like flipping a big horsepower switch.
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Old 01-09-2008, 08:11 PM
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hehe, funny thing is i want it to not purr like a kitten, i want it to sound real lopey. Im not a genious but i thought if you have .500 lift springs. you have to use .500 lift cam? or caan you use bigger cam with the .500 springs?

and also...whats the differnce between advertised duration and .50 life duration, which one do you want to go by the most?
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