Hi there.

I've been readin' some topics about TBI engines and modifications.

I have couple of questions.

How much cam (hydraulic flat tappet) is possible for 350 GM TBI engine before I need to re-program it.

Some says that max intake degrees is 205 at .050 and that LSA should be 112 or more. Are these right?

I bought a broken 350 TBI and plan is to modify it a bit to get more horses out of and use it at 4x4 Rock Crawling. Engine had a crack in cylinder head + broken head gasket. So I need to replace the old heads with slightly ported 882 heads. Need to modify the TBI intake a bit I think..... 882 heads are going for this, because I live in Finland and Vortec heads (would like to put those) are really not so common in here and I already happen to have these 882 heads.

Plan is:

-882 heads like said before

-1 to 2" tall spacer under throtle body

-better cam, but what???????????




I have these cams at home (really don't remember where are they from), but can't identify them. Can some of you help me?? Attached pics of them.


Thanks for the help, Jare from Finland

Attached Thumbnails

   

A good cam would be the Clevite #229-1730. It is the same grind as the Edelbrock performer and works well with the stock computer but still gives noticeably more power. We sell the cam and lifters for about 100 bucks US. (Not a solicitation, just giving an idea of cost.)

tom

You seem to have a good idea of what cam will work with the TBI. Duration should be 205-210 max and the LSA 112-114. Go for as much lift as you can get with that duration. For rock crawling (and those heads) you aren't going to need a cam with a big duration profile. Keep your velocity high and you should make plenty of torque for your offroading.

__________________
1997 BMW M3 - 3.2litre Inline 6 cylinder

You are right, 206 or 208 or so is about it with the stock computer.
Here's a few you might look further into-
Comp has a 206/212, .425/.440 lift, 112 LS for throttle body engines. Or they got XE (4x4) that is a 250/258, 206/214, .458 lift, on a 111 LS that might cut it too. I personally wouldn't go with more cam than either of these two.

Thanks for the info. Just now got to call around finnish speed shops to find out what they have.


Does anyone have a clue for cam ID for those cams that I attached pics in the first post????????????