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I'd want to see 60-70 HP for those changes.

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I think you will see around 3 to 4/10.
I run the exact same heads as you, also milled .050 and i changed from mild port 452's with big valves and a torker man, to my present heads and a victor man and picked up nearly 7/10 and 6 mph.
Mick

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I'd want to see 60-70 HP for those changes.

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FWIW, my car drops close to .1 in ET for each 10 HP I've added, so I'd think you could see up to .5 in ET improvement as long as the rest of the combination still works with it.

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Brad...a .5 improvement would put a HUGE smile on my face! Looking at the cam's duration specs on Dulcich's 448..they seem a little anemic for cnc-ported heads that flow as well as Jeff's do. I'm willing to bet if that motor had my 262/266 @ .050 duration cam..he would have been seeing a bit more than a 46 horsepower increase! Thanks for that info Brent! Thank You all for your opinions on this! Randy B.

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Depends of what your engine is lacking. You may even loose something if your combo isn't right to the right direction. Head flow is not a key factor. Otherwise everyone would be running hemis.

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Head flow is THE key factor to making horsepower. I guess you are just saying the combo has to be right jyrki? And everyone WOULD be running hemis if they were cheap.

Labratt my guess is about 60 horsepower gain. In the seat of the pants that is alot. It will be a completely different animal.
You can say goodbye to the 11s.

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Randy, that SQ Cam will respond favorably to the increased compression and head flow. Expect a nice improvement in torque and horsepower and the midrange should be significantly improved. The stall speed will increase so the short times will improve and it will launch harder. Hopefully it'll hook and if it does that will translate to better ET's and higher trap speeds.

A reasonable expectation would be 50hp based on the bump in comp and port work. How much that improves the ET/MPH remains to be seen but like I predicted in the other thread ; it will run into the 10's

I'll go out on a limb and predict [Email]10.85@124...hopefully[/Email] better !


Ron

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Depends of what your engine is lacking. You may even loose something if your combo isn't right to the right direction. Head flow is not a key factor. Otherwise everyone would be running hemis.

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Head flow is THE key factor to making horsepower. I guess you are just saying the combo has to be right jyrki? And everyone WOULD be running hemis if they were cheap.

Labratt my guess is about 60 horsepower gain. In the seat of the pants that is alot. It will be a completely different animal.
You can say goodbye to the 11s.

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Depends of what your engine is lacking. You may even loose something if your combo isn't right to the right direction. Head flow is not a key factor. Otherwise everyone would be running hemis.

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Head flow is THE key factor to making horsepower. I guess you are just saying the combo has to be right jyrki? And everyone WOULD be running hemis if they were cheap.

Labratt my guess is about 60 horsepower gain. In the seat of the pants that is alot. It will be a completely different animal.
You can say goodbye to the 11s.

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I'm positive that good port flow is ONE piece to the puzzle. Not the most important piece but important none the less.

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Brian..I agree 100%! If I didn't think the head work would make a BIG improvement...no way would I have spent the money that I did on them! Randy

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I tend to be conservative in my power estimates. My best guess and thats all it is would be 30-40 on the port work and 20 on the compression increase. A lot will depend on whether or not the rest of the combo can take advantage of the port work. The law of diminishing returns has never been repealed. Increasing compression from 8:1 to 9:1 will result in X amount of increased power. Going from 9:1 to 10:1 will result in something less than X and so on as the ratio increases the results diminish. Just see what your trap speed changes by. The old rule of thumb is 1 mph = 10 hp. Of course as speed goes up areodynamic drag enters into this since drag increases at the square of speed. As speed increases the power required for each increase also goes up.

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Yep... its definitely on a bell curve

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Hi,Greg! What heads do you have...and who ported them? Thanks!

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Randy they are just a set of 915's........and I ported them