blk89lx

got a b303 cam laying around want to pop it in my stock motor along with an intake. do i need to upgrade the valve springs? if so can anyone show me the right springs?

stamper5.0

i had this is my motor...it was a 306 with the b303 cam...stock heads...but i had gt-40 springs. stock intake and 100 shot and went 12.5, 12.6 and 12.7. in a quarter...if this helps u out

Baddog

Going inside your stock mill with a B cam and little else is rumoured to actually hurt performance. Any other mods besides the intake in your plans?

blk89lx

24lb injectors 73mm mass air 70mm throttle body fuel press reg all those bolt ons.

Baddog

The 24lb injectors aren't necessary at this point, the 19's will be fine until you do heads. As for the cam you'll probably notice a slight pull advantage on the high end and a slight loss of bottom end grunt until the aforementioned heads (AFR 165's would fit nicely) are in place if you even plan on doing heads. It's my understanding that the stock cam works best until headwork is addressed. IMO you may as well wait on the cam until you do heads and pay once instead of twice for opening up the motor...

ZachW04Stang

I doubt installing such a small cam will really hurt performance but you probably won't see a huge gain either.

94Blk5.0

Yep, if your going to open up the motor, might as well wait and get some used GT40's when you can.

mjr46

do yourself a favor and at least do heads with a cam swap

silver91gt

ok, from reading everyones post here so far it looks like nobody has used the b-303 cam. it will make the car pull the same as stock till 4000 rpm and then you'll really feel the difference.
when I had my stock 302 with a "b" cam and 1.7 roller rockers and 3.73 gears on drag radials it would run 13.50 @103mph and with a 125 shot I got it up to 11.98@118mph.

it will be a noticeable gain and I am speaking from experience, not from what ive heard on some internet site or from my sisters friends cousins daughters dog.

mustangsneverdie

i have the b-cam in my car now 306 3:73s offenhauser intake 650 holley hadnt had a chance to run it yet but i no its runnin pretty fast hadnt had anything around my town tou come close to touchin it yet