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I need to figure out if a stock fbody pan has enough capacity to safely supply and lq4 with .005 over pistons with 243 heads reving til around 6700 tops with a stock oil pump. all input is greatly appreciated/ if not will a ls2 gto pan fit in a stock fbody chassis. any suggestion on a pan? thanks ...also this car is auto with a 4l60e
I don't think any other stock pan fits an fbody chassis. If you want better oil control look into an Improved Racing pan baffle for the stock pan. It will control the oil movement during acceleration and cornering keeping your motor from starving. And generally most people run 1/2 to 1 quart over filled since the pan can hold it but gets pumped down quick at higher rpm.
And not that it matters for NA but compromises block strength by not being the structural member the stock pans are.
Looking at pics of the GTO pan it is nothing like the f-body, I would say no chance of it fitting.
Still curious what the OP thought the point of it would be.
The only factory pan that will fit the stock chassis is the F-Body pan.
The only other option I'd recommend is the Holley front clearance swap pan, along with our baffle, which is similar to the F-Body pan. It does have slightly higher oil capacity too. http://www.improvedracing.com/baffle...pan-p-443.html
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will either of those you guys listed fit without modification, also do i need one?
The Holley front sump pan fits without modification in the F-body. Do you need one? Not really, just adding our baffle to the factory oil pan will achieve similar results.
You may want to also consider our crank scraper (EGM-300) as that also helps reduce oil starvation and customers have been gaining as much as 9 RWHP with it.
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Oil pan choice?? 
