turbohawk

Has anyone gotten an improvement from throttle response or low end torque from their cam change with stock heads ?

John B

iTrader: (10)

This is kind of a silly question, of course you will! When I had my B1 cam and stock heads with headers/pulley/LS6 intake I picked 71 RWTQ overstock which means the tires would break loose from a roll at low RPM where they wouldn't before.

SSLink

There is a lot of controversy (despite graphic dyno evidence) on the effect of lobe separation angle on cam performance. Most aftermarket cams have tighter than stock LSA's (even though they have much greater duration). The tighter LSA's pull the power band down and give you better-than-stock lowend and midrange torque, along with an increase in topend HP. You can have your cake and eat it up to a point, usually at the expense of a slightly rougher idle. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

12secSS

iTrader: (30)

The LSA is not the one giving you better low end torque, it is the increased duration, lift and different ICL that does that. Tighter LSA = more top end potential, Wider = lower end. By low end, it is from idle to ~3000 range, mid range is ~2500 - ~4500, and top end is ~4000 to ~6000 (for typical street cams). Show me the "graphic dyno evidence" proving such and the valve timing events (IVO, IVC, EVO, EVC), not duration (@ .050" lift) and LSA numbers. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Of course a cam swap will give you a boost in low end torque, regardless of specs (except if you go beyond the design characteristics of the intake, heads and exhaust). But if you are asking about just getting a boost on the low end, go with mild duration, wide LSA and mid-upper .500 lift. Sounds very similar to an OEM, huh? Why do you think OEM cams have great low end <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> , but lack top end. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />