Low Dyno #'s, need advice
05-25-2009, 12:35 PM
#22
TECH Fanatic
see this is what pisses me off. no offense, great for you lol. our cams are pretty close, and on stock heads you are making 22 more at the wheels. lets just say my timing is way off, and i pick up 10 or 15 at the wheels, i'd still be less power than you and i have the prc ls6 heads. do those heads suck or something? they seemed like the best bang for the buck. i paid around 1400.00 for them with upgraded dual coil springs.
Remember that it's all about your combination. As was pointed out, 243s are very good heads with decent port volume. With just a little work and a very good valve job they consistently make great power and torque, especially combined with a well-matched cam.
It all comes down to if you are happy with how your combination performs. If you are trying to make a peak hp dyno-queen, then look for combinations that do that. If you are trying to make a quick, drivable street/strip car then you might look for "max area under the torque curve" combinations. 30 lb-ft extra at 3000 can make a car quicker than 15-20 more peak hp, but the dyno "bragging rights" might not be there.
Don't believe everything you read (including this post) without corroborative evidence.
Caveat emptor!
FWIW: Heads that encourage efficient "sucking" are good ones.
Jon
good one! 
05-25-2009, 07:51 PM
#27
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Also the graph he posted isn't in SAE so the #'s are going to be slightly lower than the posted #'s. For that size cam and PORTED LS6 heads it's deff. low #'s.
05-25-2009, 08:27 PM
#28
What does the A/F ratio look like I can barely read it on that chart...your clutch slipping could also be the reason for the power loss. I would degree the cam again just to make sure that it was properly installed. All dyno's are also different...