Ported Chevy 049 heads

[Carnut1]

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increased bowl ratio on exhaust as well. All three bowls had a good amout of material removed. No help.

That is clay filling a hole where the iron broke through.

[Frankshaft]

Have a hernia yet from lifting that thing on and off the flow bench?

[Carnut1]

Have a hernia yet from lifting that thing on and off the flow bench?

Lucky for me it is a half a head!

[Carnut1]

IMG_0310_zpsgcfvzgvb (1).jpg

[Carnut1]

Frustrated with no real progress on these as far as flow gains. Any input in welcome. Thanks Charlie

[Carnut1]

I should add that Bob's combo will only have .640" lift and that to keep the flow numbers as accurate as I could every test was pulled with the valve just clearing the 4.3" bore.

[Bob Hollinshead]

those tests were interesting and I am learning as it goes! Good numbers-all of them I think. Vizard's theory on the valve seat and bowl ratio having some of the biggest affect at lifts up to 25% of valve diameter I think is probably right on. Mark Jones has warned against flat milling these heads much and I've interpreted that as being important to get a good seat height for the right short turn shape and length. There's probably a lot of different theories on what works best with this casting. Someone posted a 286cc 2.30/50* combo a few years back that looked to work really well from .400-.800 it had a 91% bowl and a 3.14" MCSA,
.100 66
.200 148
.300 228
.400 294
.500 335
.600 354
.700 363
.800 372
it made near 800hp

[Carnut1]

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Found these #s from Dr.J's 049 2.25/1.94 heads made 730hp

[Bob Hollinshead]

Looking at that I'd say we are doing GOOD! Also comparing to the 049/781 results on Stan Weiss's site it appears really good. http://www.users.interport.net/s/r/srweiss/tablehdc.htm

[Carnut1]

Looking at that I'd say we are doing GOOD! Also comparing to the 049/781 results on Stan Weiss's site it appears really good. http://www.users.interport.net/s/r/srweiss/tablehdc.htm

No,no,no, I know I can do better and since I have a ruined head I need to find it! I know, I have issues!

[Carnut1]

0410161511.jpg

Flowball testing in the .3 to .6 " range. 3/16" ball. Flow loss of 1 to 4 cfm. I am running out of fun time on this so I will do more than one mod per flow test.

[Frankshaft]

Whats the combo? How much power you trying to make? Or is this just a lets see how much I can get it to flow thing? Depending on what your trying to do, may be way beyond what you need to do to achieve your goals. This thread is exactly why a flowbench can be both good and bad. It can drive you crazy! I can tell you, I have made 730hp with nothing more than 2.19 intakes, stock ex valve size, deep port match, bowl and short turn work, and an ex bowl blend and short turn roll. Granted, it was a higher compression 496, with a pretty big solid roller and a dominator, but, if your trying to make 650 hp, your way beyond what you need to do.

Frank

[Carnut1]

Whats the combo? How much power you trying to make? Or is this just a lets see how much I can get it to flow thing? Depending on what your trying to do, may be way beyond what you need to do to achieve your goals. This thread is exactly why a flowbench can be both good and bad. It can drive you crazy! I can tell you, I have made 730hp with nothing more than 2.19 intakes, stock ex valve size, deep port match, bowl and short turn work, and an ex bowl blend and short turn roll. Granted, it was a higher compression 496, with a pretty big solid roller and a dominator, but, if your trying to make 650 hp, your way beyond what you need to do.

Frank

This is good news. And it is an lets see type of thing. I am learning and helping Bob at the same time. Thanks Charlie

Maybe Bob would like to start a thread on the combo?

[Carnut1]

0410161640.jpg

Flow test after flowball testing. Let bench run longer on leakdown and pulled 0.0 cfm and 1.0 cfm. Not thrilled letting the motors run that long but it works. Flow gain on Straight port and looks like hook port could use a bit more ssr work. Maybe in a few days.

[Bob Hollinshead]

Whats the combo? How much power you trying to make? Or is this just a lets see how much I can get it to flow thing? Depending on what your trying to do, may be way beyond what you need to do to achieve your goals. This thread is exactly why a flowbench can be both good and bad. It can drive you crazy! I can tell you, I have made 730hp with nothing more than 2.19 intakes, stock ex valve size, deep port match, bowl and short turn work, and an ex bowl blend and short turn roll. Granted, it was a higher compression 496, with a pretty big solid roller and a dominator, but, if your trying to make 650 hp, your way beyond what you need to do.

Frank

Hoping to make as much power as I can with the parts I already have:
gen IV 454 block + .060, zero decked, .038 head gasket, the bores will be notched to help unshroud the intake valves
SRP small dome pistons should put me at 9.98-1 compression based on pipemax
Eagle 4340 4" crank and H beam rods
Hamburger pan, Sealed power HV oil pump
Harland sharp 1.7rockers and stud girdle-might get some 1.8's for the intakes.
Cam is yet to be determined but I have been thinking something around 250*@.050 and it will be a solid flat tappet with whatever springs the cam manufacturer specs

I have a few intakes I will try: RPM airgap and also a victor Jr with a Holley 1000HP
I also have an old weiand hole shot oval port tunnel ram with three different sized dual quad tops and the following carbs to try: 1850's, 585 cfm 4180's, 780 vacume secondaries, 650 and 750 double pumpers.

Car is a 72 Nova, 4.10 gears, TH400, 4500 converter.
Will see some hard street use and occasional trips to the track.

I wish it had more compression but it is what it is, the rotating assembly is already balanced and I'm not buying other pistons LOL
Any suggestions are welcomed! I