Missed on this combo?

IQ52 said
This will probably lend more credence to your cylinder head theory. My cam isn't that much different from what Mike is running..........

Mike...................................old Jim
.668/.668.........................638/.645
259/265...........................258/260
108 LSA/104 ICL........110 LSA/106 ICL

Yet the dyno results are markedly different. You can't race dynos, but this is my dyno, and we do calibrate it. This is the one and only pull we started at 2,500 rpm.

RPM...........TQ/HP...............TQ/HP
2500..........NA/NA............371/177
3000..........NA/NA............454/259
3500..........NA/NA............474/316
4000........419/319..........469/357
4500........497/426..........537/460
5000........523/498..........551/525
5500........506/530..........542/568
6000........483/551..........514/587
6100........480/557..........510/592
6200........474/559..........501/591
6300........467/560..........491/589
6400........457/557..........484/590
6500........448/554............NA/NA

I agree that Mike's engine is pretty good, and I think probably better than most. It could be even better.

This ^^^^^^is right in line with what I have seen. I know this is off track but I haven't seen 700 hp with a pump gas smallblock with the baddest W9's.

If I built this engine I would only be addressing the softish power down low-the HP is fine. A 3" collector 18"

IQ52 said
This will probably lend more credence to your cylinder head theory. My cam isn't that much different from what Mike is running..........

Mike...................................old Jim
.668/.668.........................638/.645
259/265...........................258/260
108 LSA/104 ICL........110 LSA/106 ICL

Yet the dyno results are markedly different. You can't race dynos, but this is my dyno, and we do calibrate it. This is the one and only pull we started at 2,500 rpm.

RPM...........TQ/HP...............TQ/HP
2500..........NA/NA............371/177
3000..........NA/NA............454/259
3500..........NA/NA............474/316
4000........419/319..........469/357
4500........497/426..........537/460
5000........523/498..........551/525
5500........506/530..........542/568
6000........483/551..........514/587
6100........480/557..........510/592
6200........474/559..........501/591
6300........467/560..........491/589
6400........457/557..........484/590
6500........448/554............NA/NA

I agree that Mike's engine is pretty good, and I think probably better than most. It could be even better.

If I built this engine I would be addressing the power down low-the HP is fine. My first move and probably last would be a 3" x 18" long collector. It ain't the carb, cam, LSA or whatever. The heads are the limit and probably turbulent or like the dyno guy said the exhaust ports probably move more into the intake manifold than out the exhaust-that is why he hates them. Put a small *** header with a long collector with a port to header mismatch-yes mismatch and watch the bottom end tq swell. J.Rob