ESTIMATED HORSEPOWER

Old 02-06-2011, 07:58 PM
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miked24
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I was curious if someone could help me in estimating how much horsepower I'm gonna be putting out? I have tried the different computer programs without much success, and this being my first engine to build. I started out buying a 454 that had been bored .30 over. The engine was running but the guy was going alot bigger so I got a great deal on it... I think. I got the complete engine plus a set of brand new in the box alum Edelbrock performer heads. Oval port 100cc chambers with 2.19/1.88 valves (part number 60499 in Jegs). I do understand that they prolly are not the best choice but I paid $2000 bucks for all this stuff. Also included in this is a set of hyper .40 over pistons, so the block is at the machine shop gettin a trim to .40 over. It also came with a pretty new 750 holly carb sitting on Edelbrock performer RPM intake (part# edl7161) that I'm gonna use. A Stock crank turned 10/10 with I beam rods is reuseable too. Now I'm looking at buying a Comp cam 227int/241exh with .479int/.465 lift hydraulic flat tappet. I'm installing all this in my '85 Z28 behind the engine is a race built 700r with a Saturday night special stall with a stock rearend that will prolly get blown apart and replaced with a 9inch.....thats all I can think of if you have any assistance i appriciate it .......Thanks
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Old 02-06-2011, 09:55 PM
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blowninjected540
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What compression are the pistons n?
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Old 02-07-2011, 04:49 AM
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I think it's gonna be 10:1. I wanna stay on 93 octane so I hope that's where it will be at
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Old 02-07-2011, 11:35 AM
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I WOULD SAY AROUND 400 HP OPINION GOOD LUCK
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Old 02-07-2011, 07:06 PM
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I just bought a different cam today instead. It's a Lunati Barebones cam and lifter kit. The schematics are 290/300 duration @.050", 224/234 gross valve lift (intake/exhaust), .527"/.533" Lobe seperation 112 intake centerline 107, rpm range 1500-5500. Part number is 10202lk
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Old 02-07-2011, 07:14 PM
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That's quite a change from your previous cam. Your going to want to make sure you have enough valve to piston clearance.
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Old 02-07-2011, 07:22 PM
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miked24
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Well I got a good deal on it I thought $125 bucks. To be honest I didnt think it was that big of a difference .. me being a rookie and all.....But I guess if It doesnt work Ill repost it on ebay for sale. But my block hasnt been decked (or at least thats what i was told) and the heads havent been shaved either. They are new, but how would a guy like me figure this out???
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Old 02-07-2011, 08:11 PM
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You will need to assemble short block with crank, #1 rod and piston, cam and lifters for #1 cyl, one head and head gasket and rockers for cyl #1 with clay on top of piston, set valve lash and roll engine over by hand. Take head off and check the thickness of the clay on the intake and exhaust valves for clearance.
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Old 02-07-2011, 08:31 PM
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miked24
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OK great advice .... thought it would be more technical than that. What is a good thickness of clay to be left on the piston? BTW love the paint job on your profile picture
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Old 02-07-2011, 08:46 PM
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Probably about .125-.150 would be good. You want to end up with about .100 clearance on the intake and .120 on the exhaust.

Thanks on the paint.
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