yes the heads you sellect DOES MATTER

[grumpyvette]

Head flow & results on a 383

 

 

CHEVY high performance mag for aug 2006 did an interesting comparison between eight different cylinder heads available for $1000 or less.

While youll need to read the article to get all the data, I found it very interesting.

The articles called

“ POWER CURVESâ€

and it starts on pg 22

http://www.chevyhiperformance.com/toc/ch_toc/index.html

 

Heres a few differant different articles

http://chevyhiperformance.com/tech/engines_drivetrain/cams_heads_valvetrain/0601ch_head/

 

http://chevyhiperformance.com/techarticles/148_0401_imp/

 

http://chevyhiperformance.com/techarticles/41598/

 

http://chevyhiperformance.com/techarticles/97538/

 

http://chevyhiperformance.com/techarticles/83858/

 

http://chevyhiperformance.com/techarticles/148_0506_thunder/

 

http://www.chevyhiperformance.com/techarticles/93863/index2.html

 

the main factors you should notice is that ENGINE DISPLACEMENT MATTER TO THE RESULTS, port size(cc)IE the difference between a 175cc to a 230cc) has far LESS effect on the power curve and peak power that the AIR FLOW, and that flow rates measured at lifts above where the CAM reaches its max lift, and has little to no effect on the power curve, the cams duration and lift and LCA effect the results, the combustion chamber design and valve size DOES matter.

And the intake and exhaust design and flow rates DO EFFECT the power curve.

[grumpyvette]

http://www.chevyhiperformance.com/tech/engines_drivetrain/cams_heads_valvetrain/0606ch_cylinder_head_performance_test/index.html

 

heres the article that didn,t post before

its worth the effort to read thru and compare the results, notice the port size had far less effect than the flow numbers, but no one single factor was totally dominate in forcing the results to be predictable

[Phantom]

Grumpy - good information. IT also counts even when looking at the old L28. Look at the difference in the torque curves between the early L28 heads (N42, N47) and the later ones (P90). It's huge.