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Old 05-11-2011, 05:13 AM
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Finally, My Build 1981 Silverado 383 pics

Been a member since 06 but been into cars my entire life, finally have money to pursue my hobbies then divorce hit Anyways scored this nice truck of craigslist for $1500.. all original with the exception of the dual pipes and 350 goodwrench motor installed in 1990. I am currently building a 383 from a non roller no vtec post 1987 one piece rear main block (4 bolt main). This will be a street driven car, pieced together with parts from, craigslist, ebay, and summit. The worst part of it is im in Italy and my sister and brother are doing all my leg work while i send them cash.. they have managed to take pics and i will finish iot off with a video when i get home on leave next month. I will(hope) to have motor installed by then and vehicle painted.
Car currently has stock 350, 700r4 trans and blue white color scheme. and factory 10bolt rear end.

I will be installing 3:73 12bolt rear end(i have, pics coming soon, 2500 stall with 350 transmission, 15x10 inch chevy rally wheels, 2" cowl induction hood(i have pics soon), and my custom 383.
Cam: CL12-212-2
http://www.summitracing.com/parts/CCA-CL12-212-2/
Heads: 67cc Chamber vortec from summit(unless i find cheaper on craigslist)
going with 600 cfm holley for now because it was free but depending on performance and gas prices will get a 750.

Any suggestions tips? I want it to run off pump gas(93 is cool) im holding off taking my heads to the machine shop so i can verify they assembled the bottom end with my parts, than i will play with compression numbers.. Any idea as to where im at(pistons are 18dished) and HP/TQ numbers? Thanks sorry for long novel im excited


Ps: more pics today and thats eagle forged crank. thanks again!
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Old 05-11-2011, 07:01 PM
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hey there nice truck! I love these older chevy pick ups, think they look really musculer. I hope the best!
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Old 05-11-2011, 07:51 PM
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I saw this post this morning before I went to work. But, usually do not post in the morning because it does not look the same as what I thought it looked that morning.

You look like you are going to have a fun ride. Good luck with it keep us updated.
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Old 05-12-2011, 03:15 AM
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well the vortechs are good 383 is a pretty torquey number might be looking around numbers in 375 ft. Pounds around the 2500 range, and concidering the gas saving issue the truck isnt that heavy giving the fact that it is just a bed, a cab and two bumpers, or i might be wrong on that. Dyno Numbers should be posted online with that same setup (or something close to it). 600 cfms might be what your looking for, considering the gas issue and if you want bigger power in the higher rpms go bigger. HEI? Coil on distributor or coil plug? like he said ^ keep us posted.
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Old 05-12-2011, 09:42 AM
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went with a set of RHS Vortec Heads off ebay for $640 shipped... seemed like a good deal they are brand new should be in next weekRHS Ebay These are drilled for vortec and traditional style manifolds.. any opinions on what to get?
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Old 05-12-2011, 12:59 PM
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hmm well the RHS's im going to look into! I have some traditional paremeter bolt pattern signiture series Eldebrocks im gonna get some vortechs though, i got the whole set for $10 off a kid brand new! felt like i was stealing from him but he insisted that he didnt care well any way w.e your heart desires, edelbrocks 106 range, i havent been worryed about those really, summit has some really nice bow tie ones with the red bow tie
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Old 05-12-2011, 02:18 PM
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Get RPM style intake manifold and use a 750 carb. A 600 will do, but a 750 will be better. Summit makes a pretty low cost 750 carb. I have one and they work great. They're pretty much a holley knock off. Professional Products and Summit Racing both make a good knock off of the RPM intake if you're on a budget. I would stick with a vortec style intake to match RHS heads due to their taller port design. The cam you chose seems like a pretty good match to your parts list.
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Old 05-12-2011, 02:21 PM
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My guess would be 425 hp and 445 tq with a 600 carb, RHS heads, and RPM intake.
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Old 05-14-2011, 04:44 PM
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Yeah Im going to go with the RPM intake thanks superbeetle.. since I got the 600 for free ill stick with that and with gas prices the way they are I will use it for daily driving.. for weekends I may make the quick swap to a 750.. more pics coming soon keep in mind its not me taking them so ill try.
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Old 05-14-2011, 04:52 PM
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Do you think that will be to the wheels?? I have the 3:73 rear and and I am going to run the 15inch chevy rallys. Also I need the rocker arms and push rods to complete the headers... The heads will be dropped of at machine shop so they can bolt them on and set my compression and such.
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Old 05-14-2011, 05:44 PM
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Taking some guesses on your specs with my desktop dyno program the numbers are 312BHP@4500RPM 392FT-LB@3500RPM. That is with 1.94/1.50 heads, 10:1CR (Shot in the dark...), Headers, Dual-Plane, and the cam you listed.

The heads are killing you... A good set of 2.02/1.60 heads that have spent some time with the bur bits, and sanding drums would do wonders.
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Old 05-14-2011, 06:24 PM
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The heads are 2.02 valves.. They are RHS vortec heads.. which is a beefier make of the 062 vortec heads
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Old 05-14-2011, 07:18 PM
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So, Pro Torker's? Details, man! Details! A broken clock is right twice a day, but I can only do so much with foggy information on your combo. When you said 67cc Vortec's from Summit, I can only guess you mean Summit 67cc Vortecs...

If Torker's are the case you are looking at right around 400BHP/420FT-LB. For power to the ground I don't even want to guess. So many factors there. Someone with a similar combo to yours might be able to chime in.

I'm a bit of a Lunati fan boy, but the Voodoo 268 might be more up your alley. It'll bump your torque numbers up at least 20-30Ft-Lb through the entire band with a slight HP loss. Plus the sound of the Voodoo cams is amazing. The Magnum 305 being my second favorite... Or, if you are die hard Comp Cams, look at the Extreme Energy. The only down side to the Voodoo is you are looking at a cam that is going to fall off at about 6000RPM, instead of the 6500RPM of the Magnum. Sounds like you want to build a street machine though, so with the smaller carb, and the fact that you are running a 383 with a dual plane you are already building a low end power house. Might as well complete the set. Spinning 6K is plenty for me lol.
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Old 05-14-2011, 09:47 PM
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They are RHS vortecs heads RHS is a division of COMP CAMS.. supposedly theses heads outflow vortecs by a small margin while weighing a couple pounds more.
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Old 05-16-2011, 08:46 AM
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"RHS Pro Torkers raised output to 428.5 lb-ft of torque at 4,300 rpm with 415.8 hp on tap at 5,800"

This is on a 350 build with a thumpr cam.

http://www.hotrod.com/techarticles/e...der_heads.html
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