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SKeown 
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Joined: Jul/30/2009 Location: Texas Status: Offline Points: 2058 |
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 Posted: May/24/2012 at 1:17am |
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What bore will the pistons be for? I'm asking to determine availability of rings.
SKeown
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amx39068
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Joined: Feb/21/2008 Location: Arizona Status: Online Points: 10218 |
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Posted: May/24/2012 at 1:49am |
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Seems we both have the same set of questions. It is always best to know what we are dealing with before making a firm recommendation.
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Dan Curtis, AZ AMC collector quality Restorations, Parts & Engines - amcmusclecars.com
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BDCVG
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Joined: Dec/19/2007 Location: Indiana Status: Online Points: 316 |
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Posted: May/24/2012 at 9:28am |
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The bore is 4.195, I have a set of Speed Pro Moly rings that are 5/64 5/64 3/16. I can get what is needed.
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1965 Austin-Healey 3000
1970 AMX 390 1986 Ferrari 328 GTB 2005 Subaru RS25 |
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SKeown
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Posted: May/24/2012 at 12:28pm |
Can you exchange those for a set with 1/16 top rings?
SKeown
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amx39068
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Posted: May/24/2012 at 12:43pm |
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With the block being confirmed as accurate, a compression height of 1.525 and an 18cc D shaped dish will render a compression ratio of 10.075 which should work great with your 8601 cam and Indy heads. The 401 in my SC/Rumbler with steel nicely street ported heads and a Torker with an Eddie 800 AVS and same cam is an animal at a slightly lower compression ratio of around 9.6 due to having the stock 28cc valve relief center ridge style Speed Pro pistons with around .002 deck.
I doubt my steel heads flow as well as your Indy heads and suspect your engine will be even more of a powerhouse based upon first hand experience, The 401 stroke produces a tad more torque with all else equal compared to the 390 stroke but your better heads should more than compensate for the negligible difference in stock torque from the stroke difference. Should be a really fun and kickass engine when done. Edited by amx39068 - May/24/2012 at 12:44pm |
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Dan Curtis, AZ AMC collector quality Restorations, Parts & Engines - amcmusclecars.com
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SKeown
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Joined: Jul/30/2009 Location: Texas Status: Offline Points: 2058 |
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Posted: May/24/2012 at 2:13pm |
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Yes, a -18cc reverse dome including the valve reliefs of 2.200 x .325 deep intake and 1.800 x .250 deep exhaust. Those reliefs are a bit deeper than you'll require with the current cam, but later? The valves start out further from the pistons on Indy heads than OEM. I would use 1/8 x 1/8 x 3/16 rings myself.
SKeown
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BDCVG
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Posted: May/24/2012 at 3:37pm |
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The Indy heads I have are 10 years old , I don't think They have changed the design.Are the thicker top rings just tougher or seal better?
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1965 Austin-Healey 3000
1970 AMX 390 1986 Ferrari 328 GTB 2005 Subaru RS25 |
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tsanchez
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Posted: May/24/2012 at 3:58pm |
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I think he meant 1/16 1/16 rings
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SKeown
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Posted: May/24/2012 at 5:33pm |
Sorry, that's what I meant.
SKeown
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BDCVG
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Posted: May/24/2012 at 7:15pm |
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Another item I found interesting, My old custom Wiseco's were 536 gms. compared to 516 for the newer Pro Tru. The old valve reliefs were noticeably smaller and the edges of the reliefs were not radiused like the new ones. The new Wiseco's really looked cool just sitting there, too bad they were useless to Me.
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1965 Austin-Healey 3000
1970 AMX 390 1986 Ferrari 328 GTB 2005 Subaru RS25 |
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BDCVG wrote: