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Old 07-09-2003, 05:31 PM
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Another how much Hp? Please!!!!

I know everyone is gettin tired of the q's how much horsepower do i have but one last one. I have a chevy c10 that have a sbc 350 in it that i am rebuilding the upper part again. the list includes
smc bored .30 over with stock crank a set of sbc chevy 350 heads with (1.94 -1.60) (202 heads) ported and polished with a edlebrock performer rpm manifold and a holley 650 carb. the block also has flat top pistons and roller tip rockers. 3.73 gears in the rearend with a new th-350 with a 2800 stall converter

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Old 07-09-2003, 05:54 PM
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Do what I did, find out what the engine came out of, find the rated HP for that engine of that year, then estimate based on your aftermarket stuff. By the way, what cam are you running?
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Old 07-09-2003, 06:33 PM
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More than a little, less than a lot.
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Old 07-09-2003, 07:51 PM
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350-375...what size chambers in the 202 heads??
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Old 07-09-2003, 08:45 PM
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the cam is lunati's 00012 hydr. cam the max dur. .515
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Old 07-10-2003, 12:24 AM
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engine horse power

when i plug youre numbers into the dyno 2000 program i have to quess compression ratio at 9.0 to 1 because you didnt let me know that much needed fact also you didnt give nearly enuff cam specs but i went to the holley web site to look at lunati cams and if its the one i think it is you have no where near enuff compression to run this cam and youre cylender pressure is probly drasticly low.... let me know the duration at 50 of the cam if this is a mild street engine like it sounds like it is 515 is alot of lift... at low rpms youre engine can not fill up the cylenders and the v.e numbers are very low volometric effecantcy excuse my spelling...at best they achieve around 86%.. i hope im wrong about the cam you chose as i would recomend a cam around 220 int at 50 and maybe 230 at 50 exh side due to compression and the factory heads also lowwer rpms.... well the computer program tells my about 335 hp but its usaly a little on the high side id say 330 horse..... post youre exact cam specs youre propper compression ratio youre exhaust size and valve size and i will give you a better engine horse power est....
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Old 07-10-2003, 12:33 AM
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don't the 202 heads have 2.02 intake and 1.65 exhaust valves?
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Old 07-10-2003, 06:28 PM
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Adv. Duration: 300/300
Gross Lift: .515''/.515''
RPM Range: 2500-6500
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Old 07-10-2003, 07:22 PM
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chevyteen17 it dependes on the heads and the type of pistons and head gasket thickness to figure actual comp, but most cast flat top pistons 76cc heads and .043 thousands felt head gaskets the comp ratio will come out to around 8.8-1 which is way to little comp for a 230-240 deg cam think more like 220 deg @.050 and 1.94 1.50s are the standard big valve production sizes 2.02 1.60 are the common over sizes any more than that and your usually gona have major problems, if your intent on keeping the cam may i suggest 64cc heads, use the eariler 305 open chamber 1.84 1.50 ho heads, have the 194 intake valves installed and alittle boul work under the valves then use a .015 thousands steel head gasket your comp should be close to 10.0-1 that should be enough to use that cam it might fall a little short on the high side but at least make some power every where else good luck mikey
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Old 07-10-2003, 08:04 PM
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71vegagt.. Could you give me an estimate??
Here's my setup"
350 bored to 355.. TRW 13:1 pistons, GM performance 492's w/ angle plugs, 2.02/1.60 valves and 64cc chambers. Victor JR intake with 750 Holley double pumper, Comp roller-soild lift cam with 630-630 lift 264/270 duration @50. Harland sharp 1.5 roller rockers. Hedman Headers full tube 1 5/8 primary, 3" exhaust tubing half way back with 40 series flowmasters. If I missed anything let me know.. Thanks
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Old 07-10-2003, 08:35 PM
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cam

Quote:
Originally posted by chevyteen17
Adv. Duration: 300/300
Gross Lift: .515''/.515''
RPM Range: 2500-6500
yes you comfirmed my night mare way to much way too little comp[ression makes for NO lowend hp or torque youre cheapest option is vortec heads with .015 inch thick head gasket threw felpro 60 hp and 80 ft pounds of torque would youre gain from the vortecs and head gaskets...
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Old 07-11-2003, 12:07 AM
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heres my est

Quote:
Originally posted by GearHead69
71vegagt.. Could you give me an estimate??
Here's my setup"
350 bored to 355.. TRW 13:1 pistons, GM performance 492's w/ angle plugs, 2.02/1.60 valves and 64cc chambers. Victor JR intake with 750 Holley double pumper, Comp roller-soild lift cam with 630-630 lift 264/270 duration @50. Harland sharp 1.5 roller rockers. Hedman Headers full tube 1 5/8 primary, 3" exhaust tubing half way back with 40 series flowmasters. If I missed anything let me know.. Thanks
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Old 07-11-2003, 12:40 AM
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power est

i wrote you long exsplain nation and allturnatives but the stupid post didnt post it saying i didnt have a thread to follow.........well anyways to keep it short about 500 horse power youre heads and headers are REALY holding you back buy quality aftermarket iron heads like iron eagle 220s or motown 230s and do some mild port work to them match the heads intake runners and youre intake manifold runners to 1206 or 1207 felpro intake gaskets....buy some 1 3/4 or better yet 1 7/8 headers dump the street headers with heads and headers youll pick up 100hp and 80ft pounds of torque..... the factory heads and yes even the camel back heads are great street heads there not racing engine heads and sure as he%$ petter out way before youre cam lift is done no top end breathing... you combined street engine parts with race engine parts make up youre mind but with 13to1 compression i think you all ready did now buy the heads witch in my perfessional opion are the single most important hopup part on a sbc... dont confuse import with bigger is allways better youre heads need to match youre engine combe youres DONT....hope this helps this is just my 2 cents but ive tuned and built alot of performance sbcs and youll be happy if you take my advise.... under youre hood lies a beast of a sbc waiting to make its owner a happy person but it needs much bigger lungs and alot bigger way to exit waste lol.....
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Old 07-11-2003, 01:52 AM
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I'm in the prosess of building the motor.. The heds have been ported by a buddy who runs 8's and has good experience. They are now in the shop getting 3 angle and re surfaced, I'm installing stainless valves and a roller spring kit. I'm thinking of building the camel humps and selling them on ebay.. with the work I'm putting into them they should bring $400 then I will get somthing better.
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Old 07-11-2003, 03:36 AM
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hp est

sounds like a good idea try the heads i suggested and youll be happy.... we run 9s in the 1/4 mile and i have a great respect for anyone who runs in the 8s thats fast..... we are a bit to conservitive for my taste but with our sponsorship were on a tight budget.... there are very few guys out there running in the 8s on middle class budget it... its just my human nature to try to add suggestions to every post i reply to to try make things better but these are only my opions good luck ....
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