ported 241's on a lq4?

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03-22-2009, 08:45 PM

#11

Pewter53

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well I have been waiting on a guy to bring me his 243's and he keeps backing out .

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03-22-2009, 08:53 PM

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dirt track racer 81

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Quote:

Originally Posted by GMCtrk

Well, the nice thing about non milled 243s is no worry about PTV clearance. He's got an LQ4, stock 64.45cc 243s would be perfect, bringing compression to a nice 10.6:1

whats the specs on the cam hes got? 243s would be nice but if the ported 241s outflow the stock 243s he could have the 241s more .020-.030 and get close to the same compression as the 243s, would have to do some figuring to be close. since he has dished pistons i wouldnt think ptv would be much of an issue but i dont remember the specs of the cam right off the top of my head.. its kinda like 6 on one side and a half dozen on the other..

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03-22-2009, 08:55 PM

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Pewter53

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Magic Stick V.4 239/242, .649"/.609" on a 111 lsa

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03-22-2009, 08:57 PM

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GMCtrk

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Well, with that cam you're gonna have to measure PTV regardless. I'd imagine that cam wants a lot of compression to work it's best

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03-22-2009, 08:58 PM

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Pewter53

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i wasnt wanting to mill these heads because of the ptv issue might just go with some 243's and trade this cam for a 23x 23x cam .

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03-22-2009, 09:01 PM

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dirt track racer 81

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yep thats a big cam go with the 243s

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03-22-2009, 09:05 PM

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Pewter53

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i'm just wanting to get in the mid 12's with this set up on motor and be well in the 11's with the 175 shot.

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03-23-2009, 08:35 PM

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SynergyV8

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Ported 241's will walk all over stock 243's.

The combustion chamber sizes aren't worth bickering about in regards to P:V clearances. 66.66cc vs 64.45cc and on an LQ4 most common folks wont mill more than .020" anyway lessening the P:V issues. Match the cam to the heads; not the other way around, especially since neither head *needs* a cam in the .6xy+ range. The Magic Stick 3 looks to be the better choice for the Corvette head selection, especially in a truck.

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03-24-2009, 04:22 PM

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Pewter53

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i could also use an asa cam that my friend has would this be a better cam ?

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03-24-2009, 09:48 PM

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skyhighsami

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The ASA is a low lift cam .525 and I would think that there are better cams out there. A MS4 cam for a truck I think is a bad idea, I wouldn't run it. You will need low end to get the extra weight of the truck moving. That or ALOT of stall and gear