 Deck Height and Valve Relief, What would you do? |
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| BeatNavy |
 Mar 4 2019, 06:44 PM
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Certified Professional Scapegoat  Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region 
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While I wait (seemingly forever) for back-ordered rocker shims to arrive from aircooled, I keep debating in my head which way to go on deck height on a 2056 rebuild I am doing:
CC volume is 59.8 (calculated by Len Hoffman) Raby 9950 (FI) cam JE Pistons with valve relief Deck height w/o any barrel shims is .032. That gives me a CR of 8.6, assuming the valve relief adds about 2 cc's to CC volume. Adding a .010 shim puts me just shy of 8.4 CR with a deck height of .042. .042 deck height is safer. Pretty sure I wouldn't go .032 deck height with flat tops, but does the valve relief give me enough "safety?" This is my first Type 4 rebuild, so maybe I should go conservative? Am I crazy considering going less than .035? I've done the "clay test" with deck height at .042, and there's no issue there. What would you do? |
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Posts in this topic
BeatNavy Deck Height and Valve Relief Mar 4 2019, 06:44 PM
r_towle Go with the shim Mar 4 2019, 06:49 PM sixnotfour valve relief cuts no mystery...find a local shop..... Mar 4 2019, 06:53 PM BeatNavy So I should probably add: I did go to my "lo... Mar 4 2019, 07:03 PM
McMark ... had him cut .035 off the jugs...
Off the top o... Mar 7 2019, 01:42 PM BeatNavy
... had him cut .035 off the jugs...
Off the top ... Mar 7 2019, 07:21 PM sixnotfour ya shims Mar 4 2019, 07:06 PM BeatNavy
ya shims
Ok, you and Rich are going to keep me o... Mar 4 2019, 07:10 PM VaccaRabite The old rule of thumb was that .040 was the smalle... Mar 5 2019, 09:48 AM BeatNavy Thanks, Zach. No head gasket. I did the play-doh ... Mar 5 2019, 10:01 AM Bleyseng Add the shim..... Mar 5 2019, 10:10 AM ChrisFoley I doubt you need valve reliefs with the FI camshaf... Mar 5 2019, 10:13 AM BeatNavy Yeah, live and learn (which is a large part of wha... Mar 5 2019, 10:22 AM Mark Henry Piston rocks at TDC, .040" is my minimum.
Th... Mar 5 2019, 10:27 AM Olympic 914
Piston rocks at TDC, .040" is my minimum.
T... Mar 5 2019, 11:20 AM  |
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