You haven't said what rpm you plan to run the motor too or how often.
Probably up to 6.5K on a stock bottom end, up to 7.5K on a strapped and
anything
over 7.5K a 4 bolt?
I'm not sure if there is a debate about line boring even when strapped.
I'd rather have a 4 bolt main on stock main cap bolts and a couple of good
bolts on the 2 extras than ARP studs on an ordinary cap.
If you have an A+ crank than you either have the journals machined down for
Spridget rods or have big journal 1275 rods or big journal A+ rods.
If you have a Marina in-line 1275 or Ital +A block either will be clearly
different from the Spridget block.
Daniel1312
In a message dated 21/06/07 07:36:07 GMT Daylight Time,
a_d_webster@yahoo.com.au writes:
>
> I know Vizard et. al. say to strap it or fit a 4-bolt main...
> 4 bolt main...line boring and the necessary deep pockets...say no more.
> As far as the strap goes... I just don't like the idea of milling away the
> guts of the main cap... I'm no engineer.. and no doubt some of you are... so
> feel free to correct me.
>
> Unless you're building a mental engine, wouldn't a set of ARP main studs be
> adequate, and considering no machining is required..similar $$ outlay as a
> strap?
> feel free to shoot me down or reassure me..I'm about to assemble an engine,
> so I might as well get the bottom end up to the task now.
> Inline 1275's are scarce and expensive here...I don't want to break mine.
>
> while on that topic... Is there any way to identify what year/series a
> crank is from by the numbers cast in it?
> I have an interesting situation which i have mentioned before where there
> is about .030 of crank end float when standard thrusts are fitted... Colin
> Dodds mentioned that this arises when an A+ crank finds its way into an A-
> block... or was it the other way around...?
> i have thinned down a set of .030 oversize thrusts to fit... but now I'm
> worried about the crank being in the right place end-wise.
> I figure BMC tolerances would let me proceed as long as there is no
> pinching between big ends and the crank cheeks.. anyone care to shed light on
>this?
>
> Andy
> Brisbane
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