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Old 12-28-2003, 07:28 PM   #1 (permalink)
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what is the most lift can you put in a stock nonstroked 302? with out the vavles hitting the pistons?


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Old 12-28-2003, 08:06 PM   #2 (permalink)
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You probably shouldn't go much beyond .500 lift without changing out the pistons. Whether or not the engine is stroked has nothing to do with whether you can install a high lift cam. The concern would be striking the pistons at the top of the stroke. Stock 302 pistons are pretty much flat tops. To run a high lift cam would requrie fly cut pistons that have reliefs to clear the open valves.
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Old 12-28-2003, 08:17 PM   #3 (permalink)
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i'm running a 512 exe. lift now. what do I need too do too change too a higher lift cam?
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Old 12-28-2003, 08:42 PM   #4 (permalink)
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I'm also running a 512 lift. Why would you want to go higher? More power or more lope at idle.
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Old 12-28-2003, 08:50 PM   #5 (permalink)
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Power!! you can never get enough can you? the car is just for drag.
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Old 12-28-2003, 10:38 PM   #6 (permalink)
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I wouldn't go above .500" lift even if it would take it. A 270 advertised cam would probably work best. If you over cam you'll just lose power anyway.
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Old 12-28-2003, 11:21 PM   #7 (permalink)
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How about adding 1.7 ratio rockers if you are not using them already ?
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Old 12-29-2003, 04:37 AM   #8 (permalink)
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Why would you want to rasie the power off of stock 302 heads? If you rasie the cam then you need spring to handle them then better valves and rockers and heads and crank and pistons, and connecting rods then a improved oil system and intake and exhast and carb and ignition and rear end and better ratio for rear gears and better tranny and better stall speed if you get even more power then axels and drive shaft. don't get in to the ands and and and and and just plan out your use for the car then decide where you want the engine to go. If you were to say hmm"a 302 with blah heads and blah pistons and I wanted to get in to drags then I would want a motor to make power at a decent RPM like 5000-6000 then we can help you plan out a motor. plans are always good like when you need to poo and you check to see if there's enough toilet paper for the end result. maybe that's were the saying "your [censored] outta luck" was from.
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Old 12-29-2003, 08:03 AM   #9 (permalink)
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Quote:
what is the most lift can you put in a stock nonstroked 302? with out the vavles hitting the pistons?
chris
Peak lift has virtually no impact on clearance because the pistons are well down the cylinders when peak lift occurs. Tight clearance occurs during overlap when the intake is just opening and the exhaust is just closing and the piston is passing through TDC. From the cam's perspective - anything compared to stock that opens the intake sooner and/or closes the exhaust later will also reduce clearance. So more duration, more overlap and tighter LSA's are what reduce clearance - not more peak lift.
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Old 12-29-2003, 10:53 AM   #10 (permalink)
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I have already ported the heads have double springs am planing larger vavles full lenth open headers getting new carb holley s/a 650 ported F4B intake forged pistons with vavle relfes MSD 6AL 9mm wires stall 2500 flash and 4.30 gears we run 1/8 mile around here and a 100 shot of N2O for getting out of the hole.

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