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Old 04-01-2012, 10:16 AM
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cam change in tbi 350

hi folks this is my first post. have been reading and learning lots of good info on this site. i got a cam that is 196 deg.intake 205 deg. exhaust @ .050 109 lsa. I know most for tbi are 112 lsa or more but i have this one. will it work for me or should i look elsewhere. this is a roller cam out of a ramjet 350. will be putting in a 95 350 gm truck engine if it will play nice with my ecu. all advice will be appreciated. thanks in advance.

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Old 04-04-2012, 04:10 PM
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I have a roller 209/210 duration@50 with .455/.455 lift on a 115 LSA and love the smooth idle and power in my 355 TBI engine. Once you get below 111 LSA it is hard for those types of cams to be computer friendly. I would suggest more LSA and look at getting a custom cam.
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Old 04-06-2012, 05:24 PM
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I would double check but I don't think the truck TBI motors are factory roller. I could be wrong but it would definately be worth looking into.
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Old 04-06-2012, 05:33 PM
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Just researched a little and I guess some truck blocks are machined for the roller setup even though they didn't run them. Hope this helps.
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Old 04-06-2012, 05:46 PM
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95 truck engine should be a roller.

With the right programming, you can live with the 109 LCA, but it takes some special idle control to make it work and it wont run closed loop at idle.
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Old 04-06-2012, 06:16 PM
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You can't just do the cam swap either, other parts have to come with it. If the engine has high miles on it, then the injectors will need replaced. You will also need a adjustable fuel pressure regulator with vacuum compensator and a fuel line pressure bung so you can set the fuel pressure. When you do the cam swap you'll need to install a timing chain and don't just get a stock replacement, get a double roller. The factory engine is in fact flat tappet and if your block has the provisions for the roller set up then you will need the shorter push rods, roller tappets, the spider and the dog bones. And as mentioned it will need a custom chip. But most of the time when you get a chip burned it's still not right, this is why it's highly recommended it be done on a dyno which costs $$$. If you just want to do a cam swap on the cheap then just get a aftermarket flat tappet computer compatible cam. Then you can keep what you've already got and would only have to make a few minor changes to get it to run good. From the factory, TBI cams are so mild they may as well have round lobes, so getting the smallest aftermarket cam for it is already a big step up from the stock unit. It's also popular to swap in the LT1 roller cam as it has I think .115 LSA and comes close to the cam you have in duration figures. Another thing to keep in mind is, if you go roller a valve spring change is in order. If you go flat tappet you can get away with the springs you have.
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Old 04-10-2012, 08:33 PM
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thanks for the responses guys. the engine is out of the truck and going in my sons 1950 truck. it wasn't a roller engine but was set up to be. all we had to do was drill and tap the spider pedestals and cam retainer ring bolt holes. had all the roller stuff out of a 305 except the cam. got the ramjet cam cheap. we are using the ecu out of a 1989 p/up and painless harness. maybe get a different chip in ecu? i should of asked you guys before i bought the cam thanks again
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