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  #31 (permalink)  
Old 12-19-2012, 11:57 AM
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The amount of actual chamber de shrouding is very very small. and its not where you think it is.
A very minimum of metal removal is all that is nessessary in the chamber to fit the larger valve.
These heads can be flat milled to a finished 51cc when all done. The physical limit is the spark plug boss and edge of the 1.94" intake valve seat.

CC the heads after rework/before milling for compression.
they will end up around 62cc when all done. CC and mill as required.
use a thin .015" felpro 1094 head gasket
Does this 305 have a flat top w 4 valve relief piston (L-69 motor) or a dish piston in it?
ya it matters. that 218deg cam needs compression.

you do not need to get all carried away with deshrouding on this head.
Use a drill bit to "gauge" the chamber wall to stock valve edge clearance, when the valve is partally open. Compare the to the larger new valve.
(.050" bigger valve radius) don;t get carried away. This is not a hi flow area. most of the flow is directed towards the spark plug in the chamber, on a SBC head. On this motor you need the compression ratio more than the chamber flow improvment.
Do not get carried away deshrouding.
Thats the whole point of just going to a 1.94" valve on this head.

flow your garden hose thru the intake port to see the flow pattern.

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Last edited by F-BIRD'88; 12-19-2012 at 12:22 PM.
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  #32 (permalink)  
Old 12-19-2012, 12:06 PM
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Unless you got and will run a 25" tall tire the 4.11's are useless on this combo.

35" tires need a 5.13 gear minimum ( not less than)
a 5.57:1 ratio is just right for this combo with 35" tall tires.

the hot rodded 305 needs to rev to make its power.
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Old 12-19-2012, 02:54 PM
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35 tall tires/4.11 gears/turbo 350 transmission/2800 pound car/6500 rpm

first gear=66//second gear=109//third gear=165

5.13 gears

first gear=52 ///second gear=87///third gear=132
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