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#1
12-05-2011, 11:28 PM
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Ross piston question
I have a friend with a set of rods and pistons I want to get but I want to make sure they are going to work with the combo I am trying to build.
They are ROSS pistons, they have 412F inside them, the bore size says 4.211 they have a .990 pin diameter and compression height of 1.30 I think they are for a 400 block with a 4.25" stroke and a 6.8 rod? Does anyone know for sure? Chris
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Chris Collier 1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans "There is no such thing as too much horsepower" |
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#2
12-05-2011, 11:49 PM
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I went on wallace racing and used their calculator and it looks like it is for a 4.25 stroke but the bore would be .085-.086" over bore on a 400 block. I dont think they can go out that far safely. looks like they are a .060 455 piston.
does that sound right?
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Chris Collier 1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans "There is no such thing as too much horsepower" |
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#3
12-06-2011, 07:43 AM
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Quote:
Yes... 4.210 is .060 455
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 1968 Firebird 10.817/122.33 3600lbs trw 455, iron d-port heads/SD intake/q-jet, 9" tires 1.440 60ft1962 Catalina 4100lbs trw 455, iron d-ports,perf RPM, 800holley, 9'' tires,(12.157@108.91)1.578 60' Oct 2010!!    
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#4
12-06-2011, 08:24 AM
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So your buddy does not know what size motor his Ross pistons came out of?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#5
12-06-2011, 09:20 AM
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He has so much stuff there, I think he just lost track of what is what.
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Chris Collier 1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans "There is no such thing as too much horsepower" |
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#6
12-06-2011, 02:30 PM
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My 67 400 Block is .090 (4.211) and is probably gonna be 4.25 shortly, and has plenty of meat in the cylinders. The early blocks can take alot.
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Kenny Cincinnati, Oh 1971 Ventura II 400 .060 Eagle Rods |
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#7
12-06-2011, 03:03 PM
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Did you fill the block or anything special?
__________________
Chris Collier 1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans "There is no such thing as too much horsepower" |
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#8
12-06-2011, 03:14 PM
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It was not filled at the time, but is now.
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Kenny Cincinnati, Oh 1971 Ventura II 400 .060 Eagle Rods |
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#9
12-06-2011, 04:41 PM
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I once had a 59 389 at 4.21 bore... Stock is 4.06 That's .150" over. However those blocks were made before Pontiac adapted thinwall casting techniques. I may take my present 59 block to 4.25" if new sono backs up sono done several years ago at another shop with less sono experience. Yep some 400's 421's, 428's, and 455's can go to 4.25".
All of them can be sleeved to that bore. |
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#10
12-06-2011, 06:03 PM
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sounds like for a 455 the 4.211 would make it a 474
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#11
12-06-2011, 08:08 PM
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I've never had a block sonic tested. What are they looking for? What is a good minimum wall thickness?
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Chris Collier 1969 firebird, pro touring build. Full Global West suspension 474 Stroker with Molnar Crank and Rods, DCI Ram Air 5 Top end, Holley fuel injection, Vince Janis 200-4R trans "There is no such thing as too much horsepower" |
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#12
12-07-2011, 01:45 AM
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If you go on Ross website you can ask a question and they will get back to you quick. I believe we need to know pinn height, those will fit in a few apps I am sure but with the wrong stroke or rods might be in the hole way to much and have no comp.
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1969 GTO 4spd. Antique Gold/black, gold int. 1969 GTO RAIII 4spd. Verdoro Green/black, black int. 1969 GTO 4spd. Crystal Turquoise, black int. 1970 GTO 4spd VOE Pepper Green, green int. 1967 LeMans 428 Auto. Blue, black int. |
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