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Messages - Steveo909

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1
Engine Mechanical / Electrical / Re: Ford 460
« on: January 24, 2018, 03:37:33 PM »
A couple things I see, FWIW:

I don't see specs for the cam except for the 108-degrees Lobe Seperation Angle.  Based on the part number, I'm going to assume 280-degrees.  The LSA is somewhat of an arbitrary number.  More important is the actual overlap number, which is the degrees of crankshaft rotation that both intake and exhaust valves are open at the same time.

Overlap is the all important blowdown/scavenging period.  This is a function of Cubic Inch Displacement and operating RPM, relative to low-lift valve flow, impacted by induction and exhaust.  The goal is to evacuate the cylinder of all residual exhaust gas AND replace it with clean air/fuel mixture.

Too much overlap allows for a higher pressure condition to exist in the exhaust system than in the combustion chamber.  This is compounded by the fact that there are always two intake valves open simultaneously.  Flow is always from areas of high pressure to those of low pressure.

If the pressure differential is too high between the combustion chamber and exhaust, the flow reverses.  The better the low lift valve flow, the worse this can be.

The above mentioned exhaust systems would typically require less degrees of duration for any given CID/RPM compared to a good header system.

Cylinder Heads

There are some basic truths about port flow, regardless of the engine make.  Piston CFM Demand is how much port flow is required to satisfy the demand of any given bore/stroke combination at a specific RPM.

Next is minimum flow required to support any given horsepower level.  SuperFlow has established some standards for this.  For example, how much fuel (and therefore air) is required to produce each horsepower.

At 475HP, I seriously don't see needing aftermarket heads.  I'm assuming the above mentioned cam doesn't have much over .550" lift.  That's with a head that will probably flow to .700" lift  IMHO, not worth the investment, however the weight savings alone is worth .1 second in the liquid quarter.

Conclusions

I would focus on the area of greatest restriction in the ports, the valve seat.  A quality modern valve job is invaluable.  I would focus on the valve seat geometry, throat and bowl.  I don't see gasket matching making any difference and could actually hurt performance.  There may be Ford specific areas that need to be addressed, such as intake to exhaust flow ratio.  It is always best to invest in the best cylinder heads that you can afford.  Just be realistic about the operating range and intended use, particularly with your intake and exhaust.

If you don't already have someone doing your heads, Lakes Only (http://www.highflowdynamics.com) is the guy.

Good luck,

Joe

2
Engine Mechanical / Electrical / Re: Ford 460
« on: January 23, 2018, 08:32:06 PM »
Not sure if the rockers I have will fit under the stock covers. I would think you could find some  covers that might accommodate What you want with that exhaust style. There are lots of options. Or you can always find a good pair of logs and snails which is what I have.



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That's purrdey 👍

1977 Challenger


3
Jet Pumps / Re: Transom plate sealing
« on: April 07, 2017, 11:30:17 AM »
I use lexel caulk on mine and works good... stays nice and clear unlike silicone... and when you go to take it off you don't need a pry bar lol


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4
Jet Pumps / Re: Transom plate sealing
« on: April 07, 2017, 11:10:32 AM »
I used the gasket on my Rogers. I like it. I think it's cleaner than a bunch of silicone.


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5
Engine Mechanical / Electrical / Re: Holley Carb
« on: April 06, 2017, 02:32:13 PM »

Looks like an 850 marine because of the fuel pump vent tube on the side. The marine 750 and smaller doesn't have the vent tube.


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Thanks. That's what I was told by my local boat shop guy too. And he's going to confirm it for me and get back to me.


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6
Engine Mechanical / Electrical / Re: Berkeley Trim Adjust/Jetovater
« on: February 23, 2017, 04:58:57 PM »
Just got texted back, the mud is nut sack deep where the boat is parked. I ain't going out there 'til spring.

Lol

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7
Engine Mechanical / Electrical / Re: Berkeley Trim Adjust/Jetovater
« on: February 23, 2017, 04:17:18 PM »
Delco window motor. I believe passenger side. I have a part number of it in the books in my toolbox.

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I've heard a '70's Suburban rear window motor. '70's Cadillac looks like it.

Dan'l

8
Engine Mechanical / Electrical / Re: Berkeley Trim Adjust/Jetovater
« on: February 23, 2017, 03:16:23 PM »
I can get a picture of it whan I get home. I beleive it is one of the late 70's or early 80's power window motors. Just want to find something similar so I dont have to screw around with modifications. Ill see if I can find a part number on it.
Delco window motor. I believe passenger side. I have a part number of it in the books in my toolbox.

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10
Engine Mechanical / Electrical / Re: D3VE-A2A Heads for 460 rebuild
« on: January 26, 2017, 11:27:49 PM »
Not a big deal... biggest part is getting that exhaust lump mowed out... that is gonna help the most to get the exhaust ports to start moving some air.

If you like, give me a call... 619-792-3885 I have a complete machine shop, so anything along with porting you may like to have dine, we can handle.


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11
Engine Mechanical / Electrical / Re: D3VE-A2A Heads for 460 rebuild
« on: January 26, 2017, 05:12:41 PM »
Maybe Bostick?

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