What is my compression with L2316 pistons

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duster360

duster360

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I am doing a build on a 340 and am considering the Speed pro (used to be TRW) L2316 pistons. I have read that they are the stock replacements for the 10.5:1 compression 340. I know I will have to take measurements but just off the top of my head with stock J heads I should be right around 9.5:1. Does this seem to be a fairly close guesstimate? Are they an exact duplicate of the original 340 pistons as in how far they go above deck?
 
they have the same compression height of 1.84....should stick out the block the same as a stock pistion.

as you say...compression will depend on your individual measurements for your engine.. ..head cc and gasket thickness.

Personally...i would also look at other pistons...the L2316F with pins weight a ton....
 
As already stated will depend on your head ccs and gasket thickness. My 340 was closer to 10.2:1 with 68 cc X heads and a fel pro 1009 .039 thick gasket. Pistons stuck .015 above the deck
 
70aarcuda said:
they have the same compression height of 1.84....should stick out the block the same as a stock pistion.

as you say...compression will depend on your individual measurements for your engine.. ..head cc and gasket thickness.

Personally...i would also look at other pistons...the L2316F with pins weight a ton....
Click to expand...

Ya, I am going to shop around a little. The 2316 are priced reasonable for a forged piston is why I am considering them. I am sure they will lose a little weight once the rotating assembly gets balanced.
 
What would the cam lift maximum be with the valve reliefs on these pistons. I would like to be able to run up to a .520 lift
 
Lift really isn't the issue. It's the duration you have to worry about but be sure to check it and you'll be fine.
 
I thing them are the piston that i have in my 340. have lasted a vary long time. BUT when i check valve to piston clearance with 474/280 Mopar Performance cam.

The valve relieves, on the piston , had a lip at the end of it causing me to not have enough valve to piston clearance.

took that lip off and had over .120" valve to piston clearance.

As has been said before, there are better option out there.
 
sireland67 said:
I have not tried this but the price looks ok.

http://www.summitracing.com/parts/cca-4975
Click to expand...

That should work just fine.
What i did was, when to the local glass shop and had them cut me a piece of plexi glass that would cover the combustion chamber. Drilled a small hole for air and a larger hole for the syringe. Next i when to the animal hospital aka vet, and got a 50 cc syringe. now you can cc you heads an well as check the valve reliefs cc of your piston.
 
as far as weight...they will only lose a few grams to get lighten up to the lightness piston of the 8...

ok..i ran a mopar 590 cam with these pistons...Valve to Piston clearance was checked and was about .080 on the intake..and little more on the exhaust due to the cam being advanced.
 
nice kit for CC heads...never seen it before. thanks
 
70aarcuda said:
as far as weight...they will only lose a few grams to get lighten up to the lightness piston of the 8...

ok..i ran a mopar 590 cam with these pistons...Valve to Piston clearance was checked and was about .080 on the intake..and little more on the exhaust due to the cam being advanced.
Click to expand...

Were you running aftermarket or factory iron heads? The only forged pistons I see available for my combo are these and a set of $600 Ross pistons on the summit racing site.
 
duster360 said:
Were you running aftermarket or factory iron heads? The only forged pistons I see available for my combo are these and a set of $600 Ross pistons on the summit racing site.
Click to expand...

Got a link?
I have the Ross racing pistons flat tops in my eddy headed (closed chamber) 340. I don't have any piston to valve problems with a cam lift of .525"/.550.
 
http://www.jegs.com/i/SRP/867/142068/10002/-1?parentProductId=753722

Here's something a little cheaper and IMO better than a Ross piston... Ross isn't "bad", but I'd rather have a J&E/SRP product.
I would not use the old battleships anymore. If you want forged pony up for them and get something decent. Compression will depend on the block's deck height and the chamber size your heads end up at along with head gasket choice.
 
moper said:
http://www.jegs.com/i/SRP/867/142068/10002/-1?parentProductId=753722

Here's something a little cheaper and IMO better than a Ross piston... Ross isn't "bad", but I'd rather have a J&E/SRP product.
I would not use the old battleships anymore. If you want forged pony up for them and get something decent. Compression will depend on the block's deck height and the chamber size your heads end up at along with head gasket choice.
Click to expand...

I will look into the SRP pistons. It wouldn't hurt to get a little weight off the rotating assembly.
 
"they have the same compression height of 1.84....should stick out the block the same as a stock piston." from an early post by 70aarcuda
SRP says 1.804

WTF
shows using stock Mopar pin size you have to watch out for chevy pin sizes
 
NHRA says

340 68-71 275-290 Trw L2316F 1.815 0.984 5/64, 5/64, 3/16
 
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