I'm a just going to throw this one out there

[1980RS]

So it looks like after this next race I may get one more shot at running this year and I want to make it a good one. I am thinking of going back to the super running Vortec 406 that I ran 10.90's with in 2019. Here's my question.

If I were to take the Vortec heads off and put my AFR CNC ported 210 competition heads on with either my ported 2925 Eddy or the S/V II all else in the engine being the same, what can I expect for a performance improvement?. The best so far was a 10.92@120mph.

[mag2555]

You can’t answer this question yet after all the post you have previously made about these two motors?

Also if you are bracket racing then why are you not more concerned about consistency per run then mph?

[steve cowan]

So it looks like after this next race I may get one more shot at running this year and I want to make it a good one. I am thinking of going back to the super running Vortec 406 that I ran 10.90's with in 2019. Here's my question.

If I were to take the Vortec heads off and put my AFR CNC ported 210 competition heads on with either my ported 2925 Eddy or the S/V II all else in the engine being the same, what can I expect for a performance improvement?. The best so far was a 10.92@120mph.

Bob,
Would you consider your SP2 heads??
With the bigger bore compared to your 358 need the bigger valve you have available which I am guessing is the AFR heads but I am not sold on them unless they been reworked and have stable flow curve.

[HQM383]

You can’t answer this question yet after all the post you have previously made about these two motors?

Or maybe he has a pretty good idea on the answer but likes to entice conversation on Speed-talk?

[ChopperScott]

Also if you are bracket racing then why are you not more concerned about consistency per run then mph?

It becomes an addiction. Sometimes it's hard to leave well enough alone when you have the knowledge, time, and budget. Spending hours tearing the car apart, putting it back together, and chatting on forums, is the therapy needed when not behind the wheel.

[1980RS]

You can’t answer this question yet after all the post you have previously made about these two motors?

Also if you are bracket racing then why are you not more concerned about consistency per run then mph?

I am not a bracket racer, I am a heads up and tester. That's all, I build all this stuff for fun and have no interest in throttle stops, boxes and racing widgets that don't let a racer be a racer. Have to race with some sort of electronics to get off the line and make your car run the same thing is like watching paint dry to me. Same as watching the S/G and S/C cars, boring as all hell.

[1980RS]

So it looks like after this next race I may get one more shot at running this year and I want to make it a good one. I am thinking of going back to the super running Vortec 406 that I ran 10.90's with in 2019. Here's my question.

If I were to take the Vortec heads off and put my AFR CNC ported 210 competition heads on with either my ported 2925 Eddy or the S/V II all else in the engine being the same, what can I expect for a performance improvement?. The best so far was a 10.92@120mph.

Bob,
Would you consider your SP2 heads??
With the bigger bore compared to your 358 need the bigger valve you have available which I am guessing is the AFR heads but I am not sold on them unless they been reworked and have stable flow curve.

I take it you are talking about the Sportsman II heads on the 358 but that is in the corner for a while, this is my Factory Vortec headed flat top 406 engine I ran a few years ago.

[steve cowan]

So it looks like after this next race I may get one more shot at running this year and I want to make it a good one. I am thinking of going back to the super running Vortec 406 that I ran 10.90's with in 2019. Here's my question.

If I were to take the Vortec heads off and put my AFR CNC ported 210 competition heads on with either my ported 2925 Eddy or the S/V II all else in the engine being the same, what can I expect for a performance improvement?. The best so far was a 10.92@120mph.

Bob,
Would you consider your SP2 heads??
With the bigger bore compared to your 358 need the bigger valve you have available which I am guessing is the AFR heads but I am not sold on them unless they been reworked and have stable flow curve.

I take it you are talking about the Sportsman II heads on the 358 but that is in the corner for a while, this is my Factory Vortec headed flat top 406 engine I ran a few years ago.

Which set of heads has the biggest port??
The vortec head is 206cc
AFR - 210 plus ??
Not sure which head would suit the cubes,BUT I do think if our cars weigh close to the same and if I can run just under 125mph with my 383 sbc your 406 should run faster

[1980RS]

Bob,
Would you consider your SP2 heads??
With the bigger bore compared to your 358 need the bigger valve you have available which I am guessing is the AFR heads but I am not sold on them unless they been reworked and have stable flow curve.

I take it you are talking about the Sportsman II heads on the 358 but that is in the corner for a while, this is my Factory Vortec headed flat top 406 engine I ran a few years ago.

Which set of heads has the biggest port??
The vortec head is 206cc
AFR - 210 plus ??
Not sure which head would suit the cubes,BUT I do think if our cars weigh close to the same and if I can run just under 125mph with my 383 sbc your 406 should run faster

Steve I sold the Large Port Vortec's last month. The ones I am talking about are the 170cc factory ones on the 406 now that ran in the high 10's@120mph

[steve cowan]

I take it you are talking about the Sportsman II heads on the 358 but that is in the corner for a while, this is my Factory Vortec headed flat top 406 engine I ran a few years ago.

Which set of heads has the biggest port??
The vortec head is 206cc
AFR - 210 plus ??
Not sure which head would suit the cubes,BUT I do think if our cars weigh close to the same and if I can run just under 125mph with my 383 sbc your 406 should run faster

Steve I sold the Large Port Vortec's last month. The ones I am talking about are the 170cc factory ones on the 406 now that ran in the high 10's@120mph

Gotcha,my bad,I remember now with the small heads,very impressive.
10.6s @ 125 plus with bigger heads is my guess

[mag2555]

Thanks for taking the time to explain yourself, as now I can view your post thru your mindset.

You hate electronics, but even for you a data logger or even a playback type tach would be a great benefit for you.

You could then see where during a run the motor spends the most rpm time at.

This would surly help you decide if a given cylinder head with more or less minimum port area would help or hinder you regardless of air flow numbers assuming both heads had a peak air flow at your peak valve lift of within 3 to 4 percent.

A head with little to no wet flow issues could make more power then running a head that air flow wise and minimal port area wise fits your needs well.

If it where my SBC motor I would be wanting one of the Dart platinum series of heads on my build.

Just some food for thought here!