Good cam size for stock 318 bottom on boost
imma go with this cam. thanks. i like it. i found on summit the cam and lifters for 150. now how do i go about getting springs for this cam. im runing 360 j heads if that has to do with anything.
http://www.summitracing.com/parts/sum-k50062/kitcombocontents/make/chrysler?prefilter=1
It depends on a few things.
- Valve heights?
- Are you going to modify the heads to suit dual springs?
- How much boost do you plan on running?
I run standard 360 heads with no modifications so i was limited to spring choice. I went through valve spring catalouges at my local parts store and picked ones that would fit. I ended up using a Ford Clevend single spring with a Damper.
130lb @ 1.68" Seat pressure
260lb @ 1.18" On nose pressure.
These are pretty weak springs for a boosted setup but seem to be working fine in my setup up to 20psi but if i rev it more than 5500rpm it falls over which i think is my valves bouncing.
If your heads are apart I'd machine for dual springs and run dual springs with pressures around
130-150lb Seat pressure
300-320lb On nose pressure
Remember springs will loose approx 20lb pressure after a few hours run time.