Re: dev 5 heavy duty valve springs
You will need heavy duty valve springs with JMM's Dev5 for sure. My dev3HL has enough lift to F*** std springs royally and valve float is not very nice.
I know JMM's springs aren't cheap but I have absolutely no fear holding first and second to the the cut out any time I want. When you change the springs you can compare the stock ones to the JMM ones and the stock springs are as weak as P***. The stock spring you just lean on to compress the JMM ones you have to lever them down.
AUII Auto wagon 4.0L InTech Pacemaker PH4480 extractors, 2.5" exhaust, JMM DEV3HL Cam Unichip 144rwkw. 1/4 mile email@example.com