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Old 10-07-2002, 11:57 PM
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Post cam and timing

I was putting together a 327 for my truck and thought I would ask for some opinions on cams and timing.. The engine is bored .060 over and the heads are 64cc. I think the compresion ratio is close to 10:1 but correct me if I am wrong (ohyeah, I used flat top pistons) The heads are stock and the block hasn't been decked either. I used a fel-pro head gasket and the valves are 1.94 and 1.50. I was wanting to use pump gas and maybe tow a boat once in a great while, but still would like it to be quick on the street. What should I set the timing at also? How big of a cam should I look at. The tranny is a th400 and I think the gears are 3.55 or maybe 3.73. (3000 rpm at 55-60mph with a 29 inch tire?) Anyway, thanks in advance!

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Old 10-08-2002, 05:30 AM
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You don't want to get carried away with duration, if this were my truck, I'd keep duration down to around 212-215 degrees at .050, if I were going to tow with it. . This is an easy cam pick, because there are so many manufacturers and grinds to choose from. Contact your favorite manufacturer, and be honest about how you intend to drive this, and you'll be happy with their recommendation. Maybe a comp 260H hydraulic or equivalent would be a good deal for you. As far as the timing goes, I would start out at 6 degrees initial lead, and adjust from there, I've always found that all of the engines I build always like a little more or a little less lead, depending upon cam, ect. I wouldn't surpass 36 degrees total advance. You are going to be right on the edge of detonation with the 64 CC chambers and flat-top pistons, especially when you hook a trailer to it. You will probably find that if you use a short duration cam, which you should, with your application, you will be getting into a little spark knock with your timing maximized, I bet you will need premium unleaded fuel especially when you tow your boat. I would buy a torque converter with a little more stall speed, maybe 2500 or so, this will help you.

[ October 08, 2002: Message edited by: NAIRB ]</p>
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Old 10-09-2002, 08:54 AM
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What is the difference between detonation and spark knock? A couple guys I asked about setting timing say two different things. One says to have the vaccum advance connected when checking the TOTAL timing and the other says not to... Thanks for your reply..
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Old 10-15-2002, 01:30 PM
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on your tyming you want to set your timing at a 34 degree mechanical advance this is done by disconnecting the vaccum line to the distributor. Then just plug in your vaccum line. If you have a adjustable vaccume advance call your local dealer and find out what the max advance should be. on a mopar small block and my total advance is around 50 degrees. the only thing that the vaccum does is get you better mileage on the road If you have it to high you will get early an early spark while driving and it will tear up your motor.
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