73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Topic started by: chevy85man on February 15, 2008, 11:37:59 pm
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Im new to this forum and just want to get everyones opinion on my build. i have a 355 with a steel crank, and closed chamber heads. its out of a 96 to 2000 vortec truck. What intake and carb combo should i go with to it can still lay it down at the drag strip and still drive good on the street?
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Chevyman, The Edelbrock Performer RPM intake(with the correct bolt pattern for the Vortec heads) & a 750 carb of your choice should be ideal. If you want to dig into it a little deeper, my friend put in the GM "hot" cam,springs & 1.6 ratio rockers & really woke it up for minimal $$$. Have Fun, Lorne
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I wouldn't go with the performer RPM unless you decide to up the cam. I'm not one for building your lift into higher rocker ratio's unless you are going to take into consideration the potential adverse effects. If you were going to go with a performer RPM camshaft or similar I would consider a roller cam (cost is much higher) otherwise matching valve springs, screw in studs and guide plates along with some good roller rockers will free up a lot of HP.
If you didn't want to change the cam and just opted for higher ratio rocker arms consider a few things, increased surface speeds and potential wear on the camshaft lobes, coil bind, rocker arm stud stress, pushrod length, valve cover clearance, and very importantly valve tip to rocker arm contact.
Is the engine out of the truck and are you planning on doing a total overhaul?
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the engine is out of the completely out of the truck. it already has a competition cam with int. 232 and exhaust 237 and double valve springs with rockers. i was looking at a Weiand Stealth Air Strike but i didn't know if it would give me the hp i wanted at the dragstrip.
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If you want more h/p take that cam you have and throw it out. Go with the performer RPM cam or similar with that intake.
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Well i looked it up and compared it to the spec sheet that came with my COMP Cams 12-324-4
Performer Rpm My COMP Cams 12-324-4
Duration @ .050'' 234° Intake/244° Exhaust .232 Intake/.237 exhaust
Lift @ Valve .488'' Intake/.510'' Exhaust .489 intake/ .489 exhaust
Lift @ Cam .325'' Intake/.340'' Exhaust .326 Intake/ .326 exhaust
so would it really payoff and would i feel a difference if i got the performer rpm? Is that the biggest cam that i could get that would still be good on the street?
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Chevyman, I understood you to mean in your first post you have the entire engine out of a 96-2000 truck, Is this correct? These were all factory roller cam engines weren't they? Or do you have just the Vortec heads on an older engine? Lorne
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Ya it is supposed to..this is the cam it had in it when i bought it
http://store.summitracing.com/partdetail.asp?part=CCA%2D12%2D324%2D4&FROM=MG
it also has 202heads. all i need is a intake and carb. i just cant decide if its worth buying a new cam for the intake that i want so it will perform good on the street and strip.
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lol, when i read your last post I thought you were referring to your cam lobe lift for some reason ??? which would have been pathetic, the reason i told you to throw it out. You'll do fine w that cam
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Not to beat a dead horse, but is the intake off of this engine now? Is this a roller cam block? How many bolts hold the intake on, 8 or 12? The Vortec heads didn't come with 2.02 vavles, so if it does have them someone put them in there. Update us please so we can give you our best advice, Lorne
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I couldnt tell you off the top of my head because its at a buddy of mine's garage. but it has freshly rebuilt. So in response to Vile, this cam would do good on and off the track with that intake and will sound good? Im sorry if i ask alot of questions but its obvious that everyone here has alot of experience and im just putting my foot in the door.
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Ok, I'm a little concerned about what the engine truly is that you bought. Do not buy an intake or cam until you get to check it out a little more. The Vortec's have 8 bolts straight down into the heads holding the intake on. The older heads have 12 going at an angle with the intake flange. I can not see any good reason someone would take out a roller set-up & put in a flat tappet cam. All you would need to change is the cam & maybe the springs. At this point, with that cam, I'm thinking that it is not a Vortec block, but you can check the numbers if it is still all together. The Vortec engines did have some oil consumption issues when they first came out, some got removed under warranty & "should have been destroyed" so they do pop up in peoples garages. There is nothing wrong with asking questions, that is how you learn & hopfully don't make the same mistakes the last guy did. Keep us posted, Lorne
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Did you buy this engine running?
Assuming that you have 9-10:1 compression. And heads preped like Vile said.
Thats a flat tappet cam and looks like a decient one. Make sure what heads you have (numbers/Date cast into the heads under the valve pans and check the numbers stamped on the block)and buy a RPM intake and a good Vac carb 700/750. Get yourself a 2500 or 3000 stall converter too. Free flowing exhaust ? After you get that together and running right start thinking about gears.
Enjoy
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here are the heads i have there vortec
14102193...87-up...305/350......1.94"/1.5" valves
Would they be any good for mild performance?
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First, they're not vortecs. And second, those heads don't flow well enough to work with the cam that you have selected...I would look at upgrading to an aftermarket set of heads such as the World Products s/r. In the other thread where you posted the head info I suggested you go with the 14101083 heads which would still be a good choice but would need the springs upgraded and at the very least need the rocker studs pinned.
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Chevyman, I think I figured out what you got. In the '80's GM started using the word "Vortec", it was even on some 4.3 V6 engines in the full size trucks. What you have is not "the desirable Vortec" '96 & up with the roller cam, powdered metal rods,fast burn cylinder heads w/no heat crossover,ect. This is why I kept asking "how many intake bolts are there?" Your heads do have 6 holes per head, correct? Hate to be the one with the bad news, but I feel what you got is just a '87 350 with a flat tappet cam & ho hum heads. Lorne