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Just got some info on the port work. As cast tests were for the most part right on with Brodex advertised numbers. He thinks intake port CCs went from 180 to 190, he will be verifying that before finished. He gave me a .600 lift figure of about 280 CFM. He also flow tested a Torker II on the as cast port it flowed about 225 CFM but didnt give me at what lift point it stalled out at that flow. Of course it depends a bit on just how much the heads flow as to were it happens.
Sounds like they would be great heads for a 383 or larger engine |
What size chamber on these?
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They are the 70cc chambers
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Price on heads new as purchased with hard coat military speck anodizing 180 IK Brodix heads. Cost 2000.00. Dropped the price to 1600.00. Now with port work added 800.00 to the price now 2400.00 a pair. Should have flow number sheets and heads next week. They are not used never been installed.
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Originally Posted by SB
(Post 4352716)
As a plug for Turbo, stock IK180's with valvespring upgrade, on a stock 260hp Mag 5.7 shortblock and mild 218/224 Comp HR just went 72.8 on a 20ft sportboat with Alpha SS. More to come as it overeved with it's current prop.
6200rpm. LOL. |
Originally Posted by Sonic30ss
(Post 4379530)
What did it run before heads and cam upgrade?
With engine upgrade, 68.1 absolute best. Stock Alpha (muffler inserts removed/1ft chop, down wind, light fuel, flame arrestor removed..ie: early fall banzai run) Same fuel load / weather condition as that Alpha SS run, 65mph. That SS run (72.8) was not a test run and boat had a bunch of fuel, flat water, bunch of fuel, muffler inserts in, etc,etc. Did a quick blast to accelerate past a friends boat that happened to be travelling by), looked at guages quickly and noticed motor was at 6200rpm (still accelerating) and pulled back right then. This motor should peak around 5400-5500rpm. Gathering more props for next year. |
Originally Posted by SB
(Post 4379536)
52mph best. Stock Alpha. Stock motor. No muffler inserts.Note: Water speedo said 59 and change. LOL.
With engine upgrade, 68.1 absolute best. Stock Alpha (muffler inserts removed/1ft chop, down wind, light fuel, flame arrestor removed..ie: early fall banzai run) Same fuel load / weather condition as that Alpha SS run, 65mph. That SS run (72.8) was not a test run and boat had a bunch of fuel, flat water, bunch of fuel, muffler inserts in, etc,etc. Did a quick blast to accelerate past a friends boat that happened to be travelling by), looked at guages quickly and noticed motor was at 6200rpm (still accelerating) and pulled back right then. This motor should peak around 5400-5500rpm. Gathering more props for next year. |
Just got back from picking up the heads will post results tomorrow tired 400 miles of rain and traffic.
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____Intake flow_______/_______ Exhaust flow
____As cast___Ported_/__As cast____Ported______W/pipe -Lift .100__ 68_______71_______------________59_________59 .200_143_______149______112________128________128 .300_195_______210______149________168________181 .400_227_______262______167________189________208 .500_242_______288______175________198________221 .600_250_______292______178________203________232 .700_251_______290______-----________204________237 |
They are CNCed and then hand blended
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