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Will these heads fit???? Posted By: T_TopBandit On: 02-19-2008 @ 20:40:33 Reply | Edit Hey everyone sorry to flood the forum but I have a few questions about vortec heads. I need to know for sure what will work and work right before I go riping apart a good running motor. I'm looking into putting 96 and later model vortec heads on my 1987 305 but I'm not sure if everything will match up. Water ports ect? Edlebrock now offers a TPI intake that fits vortec heads. I need to know what all I'm looking at as far as other changes to make this work. Such as computer programimg ect? Posted By: Pocket On: 02-19-2008 @ 22:25:54 Reply | Top | Edit The vortec intake will match up with everything on the heads. Direct bolt on Tuning gets technical http://www.thirdgen.org/techboard/diy-prom/ Look there for specifics The stickys are EXCELLENT info All of that is only IF you keep the stock ECM Several aftermarket systems are availible or you can simply upgrade to a later GM unit for much cheaper You're not flooding, these are good commonly asked questions and they need to be covered -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: T_TopBandit On: 02-19-2008 @ 22:47:28 Reply | Top | Edit Ok this is where I get lost is the electrical and computer part of it. I've always been old school where we would port grind the heads throw in a bigger lift cam and slap a bigger carb on our mopars and we go faster! I'm probably wrong when I say this but to me how dose the computer know the heads have been changed? I mean really all the heads do is bring in air and fuel and blow out exaust right? Some heads flow better then others. I'm very sceptical on alot of this chip programing because I had one done and all it did was kill my gas milage and did nothing at all for power gain. So the way I see it if you have to change a computer over better flowing heads then you would also have to change the computer if you simply instaled better flowing mufflers. I don't see any differance? Please explain if I'm wrong here? Posted By: Pocket On: 02-20-2008 @ 00:17:11 Reply | Top | Edit You need to tune it because it thinks the head have NOT been changed and will add fuel for the old setup Since you will be flowing a good bit more air this will result in a heavy lean condition Theres alot more to it than that but its a basic why this is not a carb setup plug and play kinda deal The chip you installed is an off the shelf type It removes/modifies a few elements slightly so the system works slightly better and may be a tad more forgiving of minor mods Tuning the comp wont give you power, it will let you USE the power you have Also you dont have to change the computer, its just easier if you do DIY tuning is available but there are a few companies that tune older ECMs for you if you hit a wall and cant/dont want to figure it out That help any? -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: T_TopBandit On: 02-20-2008 @ 00:44:38 Reply | Top | Edit Again correct me if I'm wrong but the fuel injectors can only flow so much the way I understand it. Isn't that why a 350 has bigger injectors then a 305 because a 350 needs more fuel? Also I thought the computer constantly monitors the air/fuel mix? So it would seem if the computer senses a lean mixture then it would add more fuel to compensate. I'll admit I'm a dum ass on EFI but I do know cars in general. I've just never got my hands in this late model stuff I've always been into the 60s 70s cars. Trying to learn tho Posted By: T_TopBandit On: 02-20-2008 @ 00:59:26 Reply | Top | Edit Another thought just came to mind. I have my old stock chip out of my computer. Is there a company that I could send it to and tell them everything I've done to my motor and they program it to specs? Posted By: Pocket On: 02-20-2008 @ 13:34:31 Reply | Top | Edit You are correct with the 305 to 350 injectors Injectors can only put out so much fuel before they max out and cant add any more You are also correct, the ECM constantly monitors the A/F mixture by the O2 sensor It can only adjust a small amount You're new at it, as am I. I cant tell you the specifics of how it works because Im still fuzzy on it and have not progressed into the tuning phase The TGO link has alot of experienced people in this field and a few in the LT1 section of this board There are some companies that reflash TPI chips but I wouldnt trust them A dyno tune would be best -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith
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