Re: trw 258 slug identified

[Tom Jennings <tomj@xxxxxxx>]

On Thu, 2 Jun 2005, Sandwich Maker wrote:

> went over to my friend's engine shop and scanned his big '73-'91 trw
> book

Wow! Thanks a million!! But not for the bad news :-)

This motor was billed as having forged innards. The rods looked
non-factory but I didn't have them out. I don't actually care that
much -- I'm not planning on doing anything high-output with it --
but it's another mark against this motor being what it was billed
as. I hope the bottom end is OK!

In fact I'm glad it's not high-compression. In fact if it's a
dead-stock rebuild that would be fine by me. The block was
definitely boiled out, not a speck of crud in the water jacket or
in the crank housing.

Thanks again for digging out this data, I really appreciate it.
Daly AUto Parts didn't have a book with this in it.



> the 3000 series is, as i recalled, cast.  forgings are in the 2000
> series.
>
> to wit, all 3.750" bore, 0.931" wristpin:
> L3000F	'steel strut'	1.581" ch	flattop			[199]
> L3101F	'braced'	1.581" ch	.118" cup		232/258 to '76
> L3102F	'steel strut'	1.581" ch	.134" dish		232/258 '77-9
> L3104F	'steel strut	1.581" ch	.140" valve reliefs	304
> L3103F	'steel strut'	1.633" ch	.158" dish		258 '80-'90
> L2340F	'powerforged'	1.598" ch	flattop			[290]
> L2341F	'powerforged'	1.598" ch	.108" cup		?
> L2360F	'powerforged'	1.598" ch	.127" cup		?
> L2480F	'powerforged'	1.598" ch	.140" cup		?
>
> so the 3103 is an '80s stock replacement cast 258 piston.
>
> and yes, that's what the 3104 description maps out to.  maybe they
> mean .140" cup with valve reliefs as well?  i thought no 304 slugs
> were flattops, though the hi-comp 290s were.
>
> and btw the cups above are flat bottomed; dishes are concave.
> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have seen
>
> adh@xxxxxxxxxxxxxxxxx                       and think what none thought

>