Dished pistons with a 396 stroker?
Thread Starter
TECH Veteran
Joined: Aug 2002
Posts: 4,055
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From: Hartsdale, NY
Dished pistons with a 396 stroker? What size dished pistons do I need for the following set up that would yield 11.4 compression:
60CC chambers LS6 heads milled .055
4.125 crank
6.125 connecting rods
Stock LS1 alumium block
Stock head gasket
Thanks..
60CC chambers LS6 heads milled .055
4.125 crank
6.125 connecting rods
Stock LS1 alumium block
Stock head gasket
Thanks..
Thread Starter
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
Re: Dished pistons with a 396 stroker? Really: thinks.. I thought it would be more...
I assume that is not too bad and that these pistons will not impact the fast burn combustion chamber too much....
I assume that is not too bad and that these pistons will not impact the fast burn combustion chamber too much....
Thread Starter
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
Re: Dished pistons with a 396 stroker? Hey LS1290:
Somehow I don't think -11CC is the right dished pistion for a 60CC head and 4.125 crank with a 6.125 rod since:
The Lunati web page indicates 10.6 compression ratio with the following dementions:
Head chamber 67CC (BONE STOCK)
Crank = 4.125
rod = 6.125
Piston = -11CC
Stock head gasket
*****************************
To arrive at a 10.4 compression ratio with a 60CC milled head shouldn't the piston dish be around -15CC - 18CC?
Somehow I don't think -11CC is the right dished pistion for a 60CC head and 4.125 crank with a 6.125 rod since:
The Lunati web page indicates 10.6 compression ratio with the following dementions:
Head chamber 67CC (BONE STOCK)
Crank = 4.125
rod = 6.125
Piston = -11CC
Stock head gasket
*****************************
To arrive at a 10.4 compression ratio with a 60CC milled head shouldn't the piston dish be around -15CC - 18CC?
Re: Dished pistons with a 396 stroker? http://www.appletreeauto.com/engcalc.htm
bore: 3.9
stroke: 4.125
deck height: 0.054 <- stock gasket thickness
chambers: 67 ( 60cc for the heads 7cc for the pistons )
compression: 11.4
bore: 3.9
stroke: 4.125
deck height: 0.054 <- stock gasket thickness
chambers: 67 ( 60cc for the heads 7cc for the pistons )
compression: 11.4
Thread Starter
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
Re: Dished pistons with a 396 stroker? Thanks..
I'm confused about the variable measurement for the pistons.
If the 7CC adjustment is designed to capture the fact that Gen 3 motors have pistons that are "out-of-the-hole," shoudn't I deduct 7CC from the chamber size instead of adding 7CC to the chamber size?
Using this logic, my chamber size would be 57CC (60cc - 7cc) and not 67 (60CC + 7CC)
Thanks...
I'm confused about the variable measurement for the pistons.
If the 7CC adjustment is designed to capture the fact that Gen 3 motors have pistons that are "out-of-the-hole," shoudn't I deduct 7CC from the chamber size instead of adding 7CC to the chamber size?
Using this logic, my chamber size would be 57CC (60cc - 7cc) and not 67 (60CC + 7CC)
Thanks...
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Thread Starter
TECH Veteran
Joined: Aug 2002
Posts: 4,055
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From: Hartsdale, NY
Re: Dished pistons with a 396 stroker? I think I have the general idea now.
If the dish is 7CC and the piston is at zero deck hieght, my chamber size is 67 (60CC + 7CC)
Question:
When I buy pistons is it assumed that they will be zero decked even though the stock pistons are out-of-the-whole?
If the dish is 7CC and the piston is at zero deck hieght, my chamber size is 67 (60CC + 7CC)
Question:
When I buy pistons is it assumed that they will be zero decked even though the stock pistons are out-of-the-whole?
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Re: Dished pistons with a 396 stroker? With a stock size .052 head gasket, zero out of deck height, and 3.905 bore I get -8 cc at 11.35, and -7.5 at 11.42 to 1 ratios. Things will change if you want to go a little out of bore with a different head gasket. Ross pistons web page has a great calculator that I always use.
Thread Starter
TECH Veteran
Joined: Aug 2002
Posts: 4,055
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From: Hartsdale, NY
Re: Dished pistons with a 396 stroker? thx stroked one...
Question: Is this engine a bad combo - some have said the stroke is too long for the stock bore....
your view please///
Question: Is this engine a bad combo - some have said the stroke is too long for the stock bore....
your view please///
Re: Dished pistons with a 396 stroker? I don't like the 4.125 x 3.900 bore idea, but I'd probably offset things by running a 114 LSA camshaft maybe straight up to keep the power peak up. My 114 LSA camshaft peaked 200 rpms than my 112 cam.
Re: Dished pistons with a 396 stroker? My old motor was an iron block, 4.060 bore x 4.075 stroke. With a S1 244/244/112 cam it make peak tq at 4400 rpms...
IMO I would not want truck like torque, so I'd run a a 114 or even a 115 lsa cam.
IMO I would not want truck like torque, so I'd run a a 114 or even a 115 lsa cam.
Re: Dished pistons with a 396 stroker?
Well maybe a 4.0 stroke with a stock bore (383CI) would be the better choice?
Re: Dished pistons with a 396 stroker? I would stick with the aluminum and do a 4" stroke. Thr 383ci is a nice setup that makes good power. I have the iron block and have had to lose some things and swap suspension to reduce the weight.
