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383 Pistons: L2315 or stock? #1197557 03/15/12 05:13 PM 03/15/12 05:13 PM
Joined: Oct 2011 Posts: 460 Oklahoma V VoodooCLD OP mopar
VoodooCLD OP mopar V Joined: Oct 2011 Posts: 460 Oklahoma	I'm going through my 1970 383 due to main bearing failure. The taper is within spec so i'm going to hone, and buy new rings. I have a chance to buy some vintage TRW L2315 pistons that are brand new for $200. I have 906 Heads that are not cut and one of the chambers checked out to 92cc. Is it worth buying these pistons, or just sticking my .040 stock ones back in? (the trw are .040 also) I've heard about issues with bad quench, but would it be a worthwhile improvement for the engine? I'm curious because i'm fresh out of college and money is really tight. its going in a 73 challenger with open rear engine and 833 4 speed. Its only used for street driving, but its just my toy and i like to drive it hard. I'm going to need to buy a cam as well, so have any reccomendations if i stay stock, or if i go with L2315's? Any help would be great, as i've done all the reading i can, but most post's about 383 pistons end with "man the piston selection for 383's sucks" My situation is a little different since money is definitely a factor.

Re: 383 Pistons: L2315 or stock? [Re: VoodooCLD] #1197558 03/15/12 07:57 PM 03/15/12 07:57 PM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	How far are your current pistons in the hole ? forget about quench , you'll have none with 906 heads unless they have been cut, at 92 cc yours have not. 2315's with be .015 in the hole on a stock deack block , these will be very close to what actually was installed in your 1970 383 . The downside to what you currently have is your compression ratio is going to barely be 9.0 , probably less , use the stock .021 steel shim head gasket or it will be even lower .

Re: 383 Pistons: L2315 or stock? [Re: VoodooCLD] #1197559 03/15/12 08:03 PM 03/15/12 08:03 PM
Joined: Dec 2010 Posts: 1,035 Missouri U.S.A. 7 71yelladustr super stock
71yelladustr super stock 7 Joined: Dec 2010 Posts: 1,035 Missouri U.S.A.	I say go for it. Forged pisons are always a good upgrade in a performance application. Even if they are boat anchor TRWs. Just make sure you got enough skirt clearance. Use a steel shim headgasket to help the quench issue. 392 gen III hemi on E-85 727 trans Dana 60 10.02@134

Re: 383 Pistons: L2315 or stock? [Re: VoodooCLD] #1197560 03/15/12 08:30 PM 03/15/12 08:30 PM
Joined: Nov 2008 Posts: 1,565 tennessee P pushbutton pro stock
pushbutton pro stock P Joined: Nov 2008 Posts: 1,565 tennessee	For the cam I'd go with a Comp XE-268-H or something around 224-230 @ 50. Last edited by pushbutton; 03/15/12 08:32 PM.

Re: 383 Pistons: L2315 or stock? [Re: JohnRR] #1197561 03/15/12 09:06 PM 03/15/12 09:06 PM
Joined: Oct 2011 Posts: 460 Oklahoma V VoodooCLD OP mopar
VoodooCLD OP mopar V Joined: Oct 2011 Posts: 460 Oklahoma	Quote: How far are your current pistons in the hole ? forget about quench , you'll have none with 906 heads unless they have been cut, at 92 cc yours have not. 2315's with be .015 in the hole on a stock deack block , these will be very close to what actually was installed in your 1970 383 . The downside to what you currently have is your compression ratio is going to barely be 9.0 , probably less , use the stock .021 steel shim head gasket or it will be even lower . The pistons arn't in the engine for me to measure how deep they set, but how do you figure the L2315's are closer to what the stock pistons were? I thought the original (real) compression ratio of those engines was like 8.1 or 8.2.

Re: 383 Pistons: L2315 or stock? [Re: VoodooCLD] #1197562 03/16/12 12:15 PM 03/16/12 12:15 PM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Quote: Quote: How far are your current pistons in the hole ? forget about quench , you'll have none with 906 heads unless they have been cut, at 92 cc yours have not. 2315's with be .015 in the hole on a stock deack block , these will be very close to what actually was installed in your 1970 383 . The downside to what you currently have is your compression ratio is going to barely be 9.0 , probably less , use the stock .021 steel shim head gasket or it will be even lower . The pistons arn't in the engine for me to measure how deep they set, but how do you figure the L2315's are closer to what the stock pistons were? I thought the original (real) compression ratio of those engines was like 8.1 or 8.2. The 71 383 has a LOWER advertised compression ratio than the 68-69 which I am well versed in , I could probably recite it's specs in my sleep , Chrysler adjusted compression ratio by sinking the piston in the bore , lower compression ratio means a piston deeper in the hole . Remember 383 piston selection sucks , the different aftermarket makers each basically sell ONE piston to cover all years of the B deck 383 even though these engines came with different compression ratios and different cylinder head configurations .

Re: 383 Pistons: L2315 or stock? [Re: JohnRR] #1197563 03/16/12 07:45 PM 03/16/12 07:45 PM
Joined: Oct 2011 Posts: 460 Oklahoma V VoodooCLD OP mopar
VoodooCLD OP mopar V Joined: Oct 2011 Posts: 460 Oklahoma	ahhh, i see. So stock for 68-69, not for 71

Re: 383 Pistons: L2315 or stock? [Re: VoodooCLD] #1197564 03/17/12 01:54 AM 03/17/12 01:54 AM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Quote: ahhh, i see. So stock for 68-69, not for 71 No they are a compromise. I don't think they are stock for any particular era , a compromise to cover them all . Maybe stock for the early closed chambered head engines ??

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