Ported Chevy 049 heads

[Carnut1]

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After some Out of tube #s I decided that more srr work, more ave loss.

[Carnut1]

That would be Pitot tube ssr #s! Not spell check b.s.

[Carnut1]

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Recut 60 degree throat cut and slight polish on ssr. Slight gains.

[Carnut1]

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Boat tail removed.

[Carnut1]

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Removed boat tail.

[Carnut1]

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Removed boat tail. This will be very thin and not accepable for racing or street use. Just looking for flow gains. Bob took lots of metal out of the roof to make the boat tail.

[Carnut1]

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Flow aftr boat tail removal.

[Carnut1]

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Since my gains on these heads are zero I decided to increase the bowl ratio and see if that helped. It didn't.

[Carnut1]

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Increased bowl ratio to 91.7%

[Carnut1]

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

[Carnut1]

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Slight gain on straight port, slight loss on hook and exhaust over original flow averages.

[Carnut1]

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I decided to take a good amount of material from the cylinder wall side of each intake and exhaust port looking for gains.

[Carnut1]

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Flow test after removal of material from cylinder wall side of ports.
Gains on both intakes loss on exhaust.

[Old School]

From what I have read you have a 45-60-75. What is your top angle?

Do you have a backcut on the valve? Very interesting, thanks for the pictures.

[Carnut1]

From what I have read you have a 45-60-75. What is your top angle?

Do you have a backcut on the valve? Very interesting, thanks for the pictures.

Bob did a 30 - 45 - 60 valve job. I added a 75 throat cut and lost flow so recut the 60 and shrank the 45. It was a bit wide anyway. The valves are Bob's as well and look like no back cuts.