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Old 03-08-2010, 06:58 PM
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first engine build

hi every one .i have a 86 iroc i took out 305tpi put in 87-95 350 .30 over flat top h597cp30 pistons felpro 1010 head gasket procomp 190 heads 1.6 roller rockers lt4 hot cam 525 lift professional products cyclone intake summit 600cfm carb im putting it together any ideas on hp duration 218 in 228ex 112 lobe shortys dynomax true dual summit race mufflers accel super coil summit hei dizzy msd 8.5 wires accel u groove plugs

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Old 03-08-2010, 07:07 PM
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I vote 425HP tops. Hard to say without cam duration or compression. I think the procomp heads will hold you back unless ported.

Download "Engine Analyzer Pro" for free and try a few combinations. You get 10 days to play before you have to pay. Or delete and re-install...
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Old 03-08-2010, 07:12 PM
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218 in 228ex 112 lobe
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Old 03-08-2010, 07:14 PM
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64cc heads 2.02in 1.6 ex
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Old 03-08-2010, 07:25 PM
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i have been reading post 4 a while i would love help building a good hot rod
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Old 03-08-2010, 07:28 PM
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I would guess around 400-4004 hp. I have the same but i'm using vortecs and guess mine about 375-395 hp and it's in my 77 camaro.
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Old 03-08-2010, 07:31 PM
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missed the key, 400-405hp
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Old 03-08-2010, 07:35 PM
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Here's what I got. Used the flow numbers from the procomp site. I think they may be a tad optimistic. Used 1 3/4" exhaust headers with standard collectors. 10:1 compression. I also assumed the duration you gave was at 0.050" lift not the advertised duration. Dual plane intake, standard heat.

408HP at 5750rpms and 424TQ at 3750rpms

Here's the print out. Of course with engine analyzers "junk in = junk out" the more info you have the closer to reality the results will be.
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Old 03-08-2010, 07:40 PM
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your cam specs are just a little under what i have. i have a lunati voodoo cam and lifter kit with the recommended springs, bored 30, 2.02;1.60 s/s valves, stock heads milled to give me a compression ration of 10to1 and are also port and polished. i am looking at 430hp. i am using a 750cfm holley carb.

might want to check to see if you are not under carbed. that will affect the performance seriously.

by the way, this was my first build as well. she is a nice one.
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Old 03-08-2010, 07:42 PM
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i researched the procomp a while first was concerned with price got them today they look gggrrreat they ll b e good 4 what iwant 400+rwhp been wanting heads blew head gasket about 2 weeks ago gave me good excuse wife bought them
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Old 03-08-2010, 07:48 PM
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Quote:
Originally Posted by 86 iroc
i researched the procomp a while first was concerned with price got them today they look gggrrreat they ll b e good 4 what iwant 400+rwhp been wanting heads blew head gasket about 2 weeks ago gave me good excuse wife bought them

You'll need a cam with a little more duration. With 1.6 rockers you're currently at .560" lift.

400RWHP is 470HP at the crank +/-. You're about 50-70HP short.
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Old 03-08-2010, 07:49 PM
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you definitely got 400+ rwhp.good luck and that was an excellent excuse.
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Old 03-08-2010, 07:51 PM
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sometimes i feel i should have used 750 but little carb calculator said buy a 600cfm 4 best acceleration up to 6000rpm
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Old 03-08-2010, 07:54 PM
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cam spec 218 in 228ex 112 lobe 492 with 1.5 525 with 1.6
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Old 03-08-2010, 08:06 PM
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Quote:
Originally Posted by 86 iroc
cam spec 218 in 228ex 112 lobe 492 with 1.5 525 with 1.6
So the 218/228 is advertised duration or at 0.50"? I factored it at .525 for 1.5 rockers and then raised it to .560 for 1.6

Re-doing the analyzer with new specs gives: (.525 total lift and 218/228 @ 0.050")
399HP @ 5750rpms and 420ft-lbs @ 3750rpms
That's at the crank, not the wheels. Again I think you would benefit from a little more duration. Also less LSA could also help.

Adding 10* duration and going to 110*LSA bumps HP to 417HP and TQ to 424ft-lbs.
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