Another cam and rocker question

jjjg_02 · Nov 17, 2009

What cam should I run B303 or E303 and what rockers 1.6 or 1.7?

birel21y · Nov 17, 2009

E303 and 1.7. MADD lift. Slight lope on idle. good power 3500-5700 RPM make sure you have the springs to back the combo up.

BlkoutGT · Nov 17, 2009

On the e303 cam card it says to use 1.6s, im not sure if you need to but just wanted to give the heads up.

jjjg_02 · Nov 17, 2009

This is a dumb question but why change the springs and what will happen if i dont? Also with the 1.7 rockers am i going to have clearance issues with the piston?

jjjg_02 · Nov 17, 2009

I'll check into it thanks

birel21y · Nov 17, 2009

jjjg_02 said:
This is a dumb question but why change the springs and what will happen if i dont? Also with the 1.7 rockers am i going to have clearance issues with the piston?

I ran mine with an E303 and 1.7 crane (cobra) RR's, with no problem. It close, but fine. In fact, i even had the head milled a bit on top of all that.

LAFENATU · Nov 17, 2009

jjjg_02 said:
This is a dumb question but why change the springs and what will happen if i dont? Also with the 1.7 rockers am i going to have clearance issues with the piston?

If you don't change the valve springs on the heads and run a cam with more than .500" lift your gonna get valve float. E303 and 1.7's your gonna be right around 220/220 @.050 .528/.528 110 LSA.

The only way your gonna know 100% if your clear is if you clay the heads and turn the motor.

jjjg_02 · Nov 19, 2009

is there any advantage to running 1.7s over 1.6 with the e 303 i know the lift will be more with the 1.7s. and heres one more dumb question how do you change the valve springs with out pulling the heads?

birel21y · Nov 19, 2009

jjjg_02 said:
is there any advantage to running 1.7s over 1.6 with the e 303 i know the lift will be more with the 1.7s. and heres one more dumb question how do you change the valve springs with out pulling the heads?

Here ya go: http://www.summitracing.com/parts/WMR-W84003/ I have to do it too. Thread it on, add 80-100 PSI of air, and make sure you dont drop it in the head. dont waste your money on the crappy stamped steel $9.99 valve spring compressors. Get a real one.