BigBlockMopar
BigBlockMember
Nice work!
I did similar work on a pair of 318 '302' heads for my 360 build.
I did similar work on a pair of 318 '302' heads for my 360 build.
Porting Mopar 318 smog heads.
- Thread starter Mopardoctor
- Start date
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Mopardoctor
318 Duster
Also with 1.88/1.6 valve ?, and did you fell the difference?, 302 heads on 360 cui will give a full point in compression. I read on a site that i should´nt go over 83% bolw of valve on intake (velocity vs. flow), or i would lose button end torque, 85-90% bolw is for top end power only they said.
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BigBlockMopar
BigBlockMember
No I did it on the stock head with stock valves.
My engine will run on propane so I also smoothed & polished the intake runners.
Also polished the combustion chambers to keep/reflect heat into the mixture.
Here's one of the almost-done pics;
My engine will run on propane so I also smoothed & polished the intake runners.
Also polished the combustion chambers to keep/reflect heat into the mixture.
Here's one of the almost-done pics;
Mopardoctor
318 Duster
Here is my open chamber Casting nr. 4027163
Mopardoctor
318 Duster
Mold of intake port, got the whole short turn and some of skijump before short turn/ smallest cross section, speeding up air velocity into turn,hopefely having wave pressure there and out to Venturi under valve.
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Mopardoctor
318 Duster
Cutting my mold up in smallest cross section, finding my high speed area in my heads, valve curtain is calculated with XE 262 H lift. Can also see how the port is twisting into chamber for swirl.
Intake gasket : 14.08 cm2
Pushrod pinch : 11.02 cm2
Cross section : 9.05 cm2
Valve throat : 12.12 cm2
Valve curtain : 16.61 cm2
My high speed area is between pushrod pinch and small cross section, out to venturi in bolw under valve.
Intake gasket : 14.08 cm2
Pushrod pinch : 11.02 cm2
Cross section : 9.05 cm2
Valve throat : 12.12 cm2
Valve curtain : 16.61 cm2
My high speed area is between pushrod pinch and small cross section, out to venturi in bolw under valve.
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Mopardoctor
318 Duster
After milling Mopar 318 open chamber 0.05 inch, there is only 0.062 inch left of chamber.
That's beautiful...I like the fact,you did the complete options of research, before you picked up a tool....And you thought about the whole combustion process,instead of just pure airflow...(Google Larry Widmer,...you will LIKE it....)
yellow rose
Overnight Sensation
How wide is the bottom cut on the intake port?
Mopardoctor
318 Duster
My bottom cut 46 degress is 2.5 mm wide.
Polish the sharp edge from 60 degress.
Throat under seat is 39,24mm in diameter/82.5% of 1.88 valve. The grey line on seat is from diamond paste.
Polish the sharp edge from 60 degress.
Throat under seat is 39,24mm in diameter/82.5% of 1.88 valve. The grey line on seat is from diamond paste.
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yellow rose
Overnight Sensation
As long as you don't have a radius under the seat it will be fine. I can't see in the pics a distinct bottom cut. Could just be the way I'm looking at it.
MOPAROFFICIAL
Oogliboogli
What exactly ate you going for here, you're milling and polishing away...depth checking shallow/quench side of the chamber...are you trying to use some custom quench dome pistons...what are the final flow numbers??
I have had so many people bring in their works of art all shiny and uniform and once they settle onto the flowbench flow not half as good as they look.
Looks are very deceiving in this biz.
I have had so many people bring in their works of art all shiny and uniform and once they settle onto the flowbench flow not half as good as they look.
Looks are very deceiving in this biz.
Mopardoctor
318 Duster
I believe a 318 combo can make nearly as many horsepower as a 340/360 cui, but not as much torque. These heads is bought/made for under 400$ with new valves, and i`m just showing how much is left of chamber, when milling cylinder heads 0.05 inch/1.3 mm for more compression, before milling 68 cc, now 56 cc chamber, this will be my version of a junkyard jewel 318 engine with stock piston.
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