Wow! No takers? I didn't realize this nailhead information was "classified". Hmmm. Maybe I should check Wikileaks ... Seriously, any help would be greatly appreciated and in the meantime, I'll continue searching the web.
Guys:
I'm new to the forum and have done several searches to augment the 401/425 engine specs I already have from other sources. I'm trying to find the following dimensions and any help would sure be appreciated:
1. Block height (CL of crank to head mating surface)
2. Connecting rod big end width
3. Compression (pin) height[s]
4. Piston dome cc where applicable
Russ
Wow! No takers? I didn't realize this nailhead information was "classified". Hmmm. Maybe I should check Wikileaks ... Seriously, any help would be greatly appreciated and in the meantime, I'll continue searching the web.
If your coming up to Sisters some time, you can measure my 425 block. It is disassembled and all the parts are clean.
There is also this in the reference section:
http://www.teambuick.com/reference/n...gine_specs.php
Along with a '66 Chassis Manual, but no deck hieghts there.
Last edited by Bob; 12-11-2010 at 08:21 AM.
WEBNOTE: When inserting an email in a posting, use the "smilie" @ so that web robots don't pick up your address and send you more junk mail!
Members can be contacted by clicking on their "handle", but you are much better off to post to the thread!
Suntreemcanic: Thanks for the offer! Unfortunately, I don't have the tool to accurately measure the block height.
Kitabel: Great web site! I bookmarked it for future reference. Got two of my missing specs (block height a 10.000" and rod big end width at .967") plus a bonus spec of the bore spacing at 4.750".
Bob: I had found TeamBuick and you're right that they have very extensive and detailed engine specs on just about everything you can think of ... other than the few I was asking about.
Anyway, thanks to all. Russ
Most 401/425 block deck heights are between 10.012"-10.020" & usually don't vary by more than .002" per side. Same with block squaring from the factory are usually within .001"-.003" per side. Rod big end widths are between .964"-.968". Compression height for 401/425 pistons are usually between 1.924"-1.926"
Tom Telesco
Classic and Muscle Automotive
12 Cook St.
Norwalk, CT 06853-1601
Day Phone 203-324-6045 ET
NailHead Mini-Starters '53-'66
Adjustable Roller Tip Rocker Arms - All NailHeads
Custom forged pistons
Front & rear neoprene seals
Many other "Nail" parts
"If I can't get it, you don't need it!"
Tom:
Thanks for the more accurate values for the block height and rod width, and for the compression (pin) height. I guess when there's a range and the web site's presentation allows for only a single value, the author picks something in the middle. I, of course, prefer the factory range you provided so I sure appreciate your input.
Russ
Piston Domes, measured:
Stock '64 401:
4 pistons measured:
46.1 cc
45.4 cc
45.5 cc
45.9 cc
Zollner 401 replacements:
46.5 cc avg
Ross 425 Forgings:
44.4 cc
TRW 401 Forged NOS:
45.3 cc
Now would you tell us what you're up to???
Walt
65-66 GS's
wkillgs:
Thanks for the piston dome CCs. I knew from photos that they were substantial (and necessary) to result in the 10:1+ compression ratios, given the size of the Nailhead combustion chamber.
And, as usual, I'm up to no good ... Seriously, I'm setting up my "baseline" engine analysis spreadsheet. From there, I can make various changes and see how that affects various ratios (bore:stroke, rod:stroke, static compression, etc.) and such. Some of these detail specs also allow one to look at possible replacement components from other sources and platforms.
continued ...
Last edited by RussKing; 12-13-2010 at 04:13 PM.
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