Ditto . Pull the backplate & inspect in strong light . " NEVER FUELED " means it wont have rotted out .
The Ealier dual ring head is the open ' hemi ' . Later said to vary a bit between series, perhaps .
The tapped muffler bolt / blind hole ones are generally ( ALL ? ) P.D.P. , 4 or 3 ( concave head fins ) port ' windows ' .
If you MUST fiddle with it , theres info about , but appoach varies to a slight degree .
http://clamf.aerosports.net.au/newsletters/ACLN/Issue39.pdfI believe Mr Garifoi may have known what he was doing , regarding FITS . So I wouldnt Alter Them !!!!!!!!!!!!!!
The Wrist Pin . ( or gudgeon pin , to those that speak english
) is the archiles heel , on a USED MOTOR .
To the extent that if you DO dismantle any S Tigre ( or OS Max 40 old type ) you may be in for grief, a test of patiance at least .
the clean & ( singer Sewing Machine ) OIL , is only needed , after the fustration of extracting the thing . Wot Fun .
You can only drop the sleeve a iota , before you get sub piston induction . ( Open under piston at T D C ) only say 8 thou. ? on the 3 window P D P ones .
Most others open at ends from piston crank cut away , so adding to it wont help . Picture of alleded T & L below ( Tom Lay Stunt Tuned )
Most / All T & L have the Piston Baffle scalloped both sides , at the center . Said to alieviate heat distortion of piston . Hight still full right thru tho .
A knife blade edge'll do it . the ' remove all burrs & sharp edges ' in the combustion chamber - piston , means . . .
Very Light dressing of baffle & baffle slot ' hard edges ' , in any full size engine this is to remove ' hot spots ' that can create ' Pre - Ignition ' .
Obviously theres the ' Cross Drilling ' the case for a central spray bar . If yours is the stock C L Intake , I wouldnt . Or do it & send the intake to ME .
A Steel Rod , 4 m.m. / 5/32 through the Std spray bar hole , alows all sorts of measurements and parrallelity . a foot long . DONT drop it though .
a SEALED Front Bearing , if its a early one , may give better economy . plus theres bushed & unbushed rods .
theres the ' Big Jim ' with the reduced hight fins . 3/32 they say . ( 2.4 or 2.5 mm left ) . Tho some are ' No Fin ' . said to eliminate ' stumble ' .over cooling.
Best things to find a real nice muffler , Not a toungue if its the S P I prevelant one , due to back feeding / back pressure .
parently theres two I D outlets in Big Art ( adamisin ) mufflers . says Windy , on a tape . Small ones restrictive .
Std. ' Big Jim ' Intake is .312 inch . Also , a head a good fit , diameter matching bore , not loose. will help .
From picking the eyes outta the stuff we've seen . over the years . CLEANLYNESS is imperitive . Ferrari was No Smoking in the Engine assembly rooms .
One of the classis SPEED Engine Prep articals ,
http://www.avia-it.com/act/biblioteca/periodici/PDF%20Modelismo/Aeromodeller%20Annual/Aeromodeller%20annual%201968-69.pdfIf they got the clearances next to clapped out , they went best. As everyone new a engine went best just before it blew up .
LOOSENING the fits was mainly to ease servicing . Correctly Aligned Interfearance Fits are what most things have most times . In high output engines .
Intro to mares nest ,
http://classicpattern.com/super-tigre-st-60/?lang=en Early liners 26 O.D. , soon revised to 26 . 5 m.m.
Is your engine the ' Muffler Lug ' on case , type . Gotta Picture . blue or red box . or big red box .