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Old 12-04-2002, 01:48 AM
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Post 305 Chev looking for flat 14's


I'm from Australia and I have a 1973 Holden HQ sedan with a stock Holden 253 V8. If what I've read is true this is a the same as your Chev "F-body" cars, it should be about 3350 pounds with a small block chev installed. I happen to have a 305 chev and TH350 in the garage, it's been there for years and since this car had the 350 chev as an option I've decided to use the 305 engine in the HQ. The heads are stock 14014416. Looking around on the net tells me that this engine is from a 1980 Camaro So far I've pulled the heads off and and ported them more less exactly like David Vizard says to in his sbc heads book I also polished the combustion chambers removing the least metal as possible. I also put some smooth edges on the back of the exhaust vavles and a 30 deg cut on the inlet valves (to save money I'm using the standard valve sizes 1.84 and 1.5 inches), It took me weeks to port the heads and I must say they are a work of art if not a work of performance I hope both : D, I think I've done enough to get my aim of 350 hp (I've spent hours and hours with dyno software to learn whats going on with this engine). I'm going modify and use the Original Quadrajet that came with the motor, I also had laying in the garage a Weiand 7546 single plane manifold so I'm going to use that, to me this manifold looks like it's got a really bad design where it curves or infact doesn't curve much into the head so I'm not sure if I should reshape this or if it's ok, still it should be better than the stock 4bbl manifold right?. What else? well the bore or the engine looks really good so I might be able to get away with just new rings, I'm considering flat top pistons but the fuel here in Australia isn't what it used to be so anything more than the stock compression (I think is 8.75 to 1?) might give me problems. For a camshaft the one I really want is a Summit 1105 but I don't think it's available in Australia and I havn't seen anything similar to it from another company yet, I'm looking for decent torque and peak power (350 hp )to happen at 5500 to 6000 rpm. Headers in the shops here are also shorter than what I want (also cost too much for what they are) so I'll probably have to learn how to make myself some tuned length headers aswell. Anyway I just wanted to introduce myself and let you know what I'm up to, this is the first time I've atempted to build a car engine so I've got lots to learn, I just hope I learn enough fast enough to not make too many big mistakes. If anyone has any little go faster ideas for a 305 then please let me know oh one more thing I was wondering about is the holes in the inlet ports under the rocker studs, I have a question about those, can you use mallory epoxy in those without too much risk of it falling out and is the hp gain worth it, is there any gain? sure looks like it would be worth a few hp to me. I thnk welding/filling the egr ports is beyond me so I'll just forget about those for now and remember them when I'm trying to make some very "extracting" extractors


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Old 12-04-2002, 02:19 AM
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Ahh that epoxy I was looking at using for the intakes (under the stud) was Manley A & B epoxy

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Old 12-04-2002, 06:16 AM
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In this post there are several links to 305 build ups. Might give you an idea of what needs to be done. Dan

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