well after measuring the total deck height from base to top the measurement is 6.300 inches !!!
that makes it the same as sst60 , BUT the pistons on the oval port DO NOT protrude above the deck !!
Both My standard oval port56.1 cu in blocks are both the same measurement as in deck height of 6.300 inches
( will be measuring this again to make 100% sure with different gauge)....
ive took a pic of the internals of the ports, they realy do need a clean up big time.
the exhaust port measured from the top of deck is exactly 1.500 inches and could be taken to 1.450 by grinding the sleeves.
to my surprise the oval port sleeves are already chamfered on the top and bottom of the port in the middle as in picture below.
this would need to be put back if port is raised to stop any snagging of the rings. ( I think ).
I did hear of someone putting in a chamfer on his oval port engine so I dont know if they are all like this.
the transfer ports and boost ports are real bad inside, the glue lines are very thick and deep causing a lot of un-wanted turbulence of fuel/air flow. with these cleaned up performance must be a tiny bit better.
here is a pic of the foam glue lines inside the ports ,
now if the ports are raised and the chamfers put back in and angled upwards and inlets cleaned up and head shaved to
sst60 spec what sort of power gain over the existing standard amount of hp could this roughly achieve ?
( I know its not going to be exact but a rough estimate would be good).
I dont want to be touching anything if some real big gains are not going to be seen.
I would want atleast in the region of a 10hp gain for it to be worth stripping everything down and rebuilding an otherwise
perfectly normal engine.
ALSO more to the point, would this cause any detriment to the life expectancy of the engine /
it would never be pushed above 6700 rpm.
.