hi !! if i can make a chip to run a 107 lsa cam , so what will be the best choice a zz4 208:221 .050 in duration with .474 int .510 ext 112 lsa or comp cam thumper 08-600-8 227:241 duration .050 in .518 int .503 ext 107 lsa both 1.5 rocker ratio lift this is for a 383 strocker with fully ported alluminium corvette heads with hsr intake ...

 

107... Big IF
Do a search , the Thumper cams don't get a good review because they mostly make your engine " sound " lumpy because of the big overlap
There are better cam choices for a 383 out there .Look at the many online 383 builds and see what cam they used.
Why try to reinvent the wheel?

 

i know theres always better but right now ive got both of these cam in my hands so for now i dont want to by another cam if you think thumper cam is better tant z4 cam ill go for it

 

with the thumper cam your going to get more power and sound obviously but your going to have a lot of "fun" tuning for that...

the zz4 cam you wont have hardly any trouble tuning for and will still net you a good amount of extra power.. Personaly, I would go with the zz4