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Old 03-06-2006, 09:16 AM
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Too much cam???

I'm going to be assembling my 355 here shortly but i'm having some indecsion on what cam to run. Heres the engine specs 355 sbc, gm steel crank, eagle 6" rods, speed pro hyper. pistons around 9.8:1cr, Bowtie phase 2 heads ported and polished, dart kool can intake topped off by a 750dp. The engine will be going in either a early 70's datsun z or a s10 so it'll be fairly light. I plan at least a 3.73 ratio and it will be a stick shifted. Okay on to the cam part currently i have a melling hyd. with 234/244@.050 .488/.509 lift 112lsa. My machinist has a nice used set of crane energizer rockers with a 1.6 ratio for cheap, this would put my lift to .520/.543 will I have clearance issues with the pistons and is there too much duration?? I was looking into a comp cams xe274 with the 1.6 rockers would this be a better choice?? This will be street driven but I plan on bracket racing on the weekends. Any input would be great.


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Old 03-06-2006, 10:01 AM
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According to the website below, those heads started life with a 184cc intake runner. I would assume that after porting they are close to 200cc. That being the case, I would recommend the larger of the two cams that you are looking at (234 244 @.060 with the 1.6 rockers). The motor will probably start to come in strong around 2500 RPM, but being that you will be using a stick, that doesn't really matter. It is hard to say if you will have clearance issues, but I have a friend with a 383 with a 236 242 @.050 cam with .530 lift after 1.6 rockers, and he had no problems with valve clearance with .045 quench. Your motor is a little different from his in that he had a slight dish, and I am pretty sure you will be closer to a flat top. In any case, the only real way to know is to check once you have the motor together.

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