stock 243 heads with big cam?
03-05-2013, 08:42 PM
#1
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stock 243 heads with big cam? How well will stock 243's do with a big cam? .630/.620 range. I'm on a budget so cnc port is out of the question. Will they really choke my 346 much? I can get them cleaned up and polished for $300. Is it worth it or should i stay as cam only and leave them alone?
03-05-2013, 08:48 PM
#2
The 243's wont choke the motor with that cam, i know guys running stock heads w/cam specs like that. Your case the cam, along w/untouched 243's, will see some some gains, and it will support the cam along with raising your compression ratio. Just make sure u accompany the heads w/ the right springs etc.
Edit: I think $300 is too much for just a clean up. U should be able to get them cleaned up and atleast a valve job for that.
Edit: I think $300 is too much for just a clean up. U should be able to get them cleaned up and atleast a valve job for that.
Last edited by z28241; 03-05-2013 at 09:43 PM.
03-05-2013, 10:23 PM
#5
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what kinda intake/exhaust are you running? ls6 would be good but with a cam like that a fast would do better. guessing u upgraded ur rockers and push rods as well
03-05-2013, 11:10 PM
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Im actually installing my stock 243's with a valve job,dualsprings,etc,upgraded pushrods with the torquer v3 cam. Im doing the install next weekend...will let you know the results
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03-06-2013, 04:25 AM
#9
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Hi to all, please when giving cam specs, why do people always think a cam is big if it has big lifts. Cam is measured by durations.
And lift has almost nothing to do with piston to valve clearance. NOTHING.
And lift has almost nothing to do with piston to valve clearance. NOTHING.
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DualQuadDave (10-08-2021)
03-07-2013, 06:25 AM
#19
Running a 238/242 .595/.595 112lsa cam in my old 346 and had good ptv when measured, but when I tore the heads off to port them I had marks on every piston where the valves touched atleast once....I guess a few over revs? I got lucky and didn't do any damage, but flycut a hair just to be on the safe side.
03-07-2013, 01:04 PM
#20
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i have been debating on running my 244/244 .613/.613 cam with my stock 863 heads on my truck. or possibly 243/799's but have held back bc i have heard about ptv issues. is it different for every engine?? how come some have issues and others dont? headgasket thickness? CC's?