Which combo sounds reasonable for a stock TBI w/ performer intake:

1st combo - LT1 cam w/ 1.6rr and L98 Heads.

OR

2nd combo - LT1 cam and ported/polished LB9 Heads.
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I like the 1st combo, but I've been told that larger cc chambers will lower compression though. How would I make up for the loss of compression?
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Oh man,...now I'm confused

Akshay

 

I would have to say that you would be better off with the LT1 cam with 1.5 or 1.6rr and ported/polished 305TPI Heads.

 

ok i am a little confused.

both sets of heads you listed (i assume when you say 350, you are talking about l98 heads) are not lt1/lt4 heads, what does the combustion chamber size of the lt1 vette head have to do with this combo?

first question. 1.6 rockers do not incread duration, the increas lift. example. if you cam specs are 208/212 .488 .495 with 1.5 rockers, when 1.6 it would really be 208/212 .520 .528 durration doesn't change, but the lift increased and with the increased lift, you get more airflow (no flaming here, we all now our fluid dynamics but for this example we are going to use that statement)

i hope that at least answered you 1 question, but for the rest of it, you are going to have to clerify exactly what it is you are wanting to do, are you thinking of trying to use lt1 heads? i think you are confusing a few things in your first post. maybe you can re-post and clarify for us, and let us know exactly what you are asking.

 

I clarified my post.

Akshay

 

I'd honestly go with something like the World Products heads and a custom grind cam...if not, you could settle for a LT1 cam, since they're much better than the piece of crap in the L03 to begin with. You'll need to do springs and all that, and it would probably help to get your computer re-tuned so you can gain as much power as possible. Better yet, get a 350.

 

Actually, duration does change. Although the cam spec stays the same, 1.6 rockers will "effectively" open the valve sooner and close it later than with 1.5 ratio rockers. That's why the cam "acts" like a bigger cam when the change is made. CHP recently did an article on this subject. Overall, higher ratio rockers will add 1- 2 degrees to duration. At .500 lift, the duration increases by 19degrees. That's true for any cam.