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  #16 (permalink)  
Old 12-15-2012, 07:59 PM
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That Datsun should run low 14s or maybe high 13s in the 1/4 mile with the 305

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Old 12-15-2012, 11:03 PM
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Looking for help on 305 SBC

Well to start I would bore it .030 and add a set of flat top pistons. With your heads the compression would be about 9.3. For a cam I would use a Lunati hyd. roller PN. #20120712 Voodoo Retro Fit Hyd Roller Cam - Chevrolet Small Block 282/290 - Lunati Power. with roller lifters and valve springs. Use the .015 steel shim head gaskets to have a quench of .040. Have heads checked out, valve guides and new positive stop valve seals. In stall a MSD ready to run 8360 Pro-Billet distributor to make it easy to set the advance curve. This 305 engine should make the 260Z fly.
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Old 12-15-2012, 11:06 PM
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Understood. If I verify what 327/350 says about the heads (194/150), and we shave .030, would you
guess the lift would necessitate head modification? I also need to make a decision on pistons and I'd guess this has dished, doubt they're flat. Getting into domed p's is getting into $'s. Anyone have a
guess at what result can be had with the current head/intake/carb combo, shortie headers / free flow exhaust, best cam/valve set up hp/tq/rpm?
Jack
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Old 12-15-2012, 11:23 PM
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Every engine needs to be checked for critical clearances. This needs to be measured, not computed from published figures. At lifts above 0.480" or so, this becomes more critical and at those lifts the chances increase for the need to machine the valve guide bosses for seal to retainer clearance.

On those heads I don't really see a need for lifts above 0.500 or so unless the heads are ported.

Milling heads
Valve spring installed height
Points to check
Geometry

Last edited by cobalt327; 12-15-2012 at 11:29 PM.
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Old 12-15-2012, 11:36 PM
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How to negate air flow issues with a shouted intake valve on these 305's I have seen successful use of EFI/turbo charging.As long as you are sensible with the tune and turbo's don't like engine high rpm's or long duration cams,the stock bottom ends live fairly well.The turbo's aren't that hard on bottom ends as say nitrous would be.The toughest part is getting a size turbo from a pick and pull that is just alttle undersized for a 305 to limit turbine lag time and to tap off a oil feed for the turbo.The rest is just fabrication time.
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