Port heights and confusion about raising the exhaust to sst60 specs.

[phillnjack]

Well loads of people on the net talk about raising exhaust ports to sst60 spec etc.
Now after measuring the port heights several times, and even got someone else to measure them too, on the oval port motors the
exhaust ports are already at the same height as the SST60 !!!
turn the crank so the pistons are at Bottom dead centre and you will find the sst60 and oval port blocks are same height ports !!!
it seems people are measuring from the top (deck ) and thinking the ports are too low comparing them to a SST60 , well I understand that, its
because nobody is taking into consideration that the deck on the SST60 is 55 -60 thou lower than the bridgeport or oval port blocks. !!!
its a skimmed/decked version of the 56 cu in block.
this is why the pistons protrude into the cyl head a touch on the sst60 race motor as standard..
My measurements show the top of the exhaust port to be at 1.520 from the top (deck) , sst60 can be as high as 1.465 , now add
add 55 thou to the sst60 deck height that has been shaved off and you get 1.520.
( SST60 can also be 1.520 as maximum measurement from the top according to APBA rules).
so now what do you do with the oval port ? its already at the same height if you measure from the top of the piston at bdc.
I am not going to get the deck shaved and then have to mess around with different squish bands etc, the head can stay flat ,same as bridgeports

so now I am thinking should I not bother in raising the oval port any higher, and look at other mods instead.
I am thinking about widening the actual exhaust port, but nobody has mentioned anything about the port being made wider on a 56 oval port.
can anyone shed any light on what exactly is the gain if I make the port wider ?
is this something that is not a good idea for some reason ?
some of you might have already done something like this with your oval port motors ?

[phillnjack]

By the way I am well pissed off finding the ports are this height, I was expecting to find them lower so I could raise and gain etc.
so now I am having to seek a bit of power elsewhere.

[outasite]

Making the port wider can bring on other problems,the ring will start to climb into the port,and the champher must push it back in on every stroke.Thats why the Bridgport was born.

[FMP]

Put a degree wheel on it on you'll know for sure.

[phillnjack]

know what for sure ?

[FMP]

Stroke and port height not what it is from the deck

[Hupiveneilijä]

You cant compare those 2 ports because they are so different shapes.
I have in my bp ex.open 176deg, dont know is it too much�� will see. And blowdown is 25deg , might be too little.

[phillnjack]

the shape of the port is not realy oval. the bottom of the port is narrow than the top by around 1/4 inch
this below is the exhaust port with idle relief above to the left.

on the left side behind the port there is about 1/2 inch of room, on the right side of the port its almost level with alloy.

there is about 1/16th of an inch above the port before hitting the roof.
these are not big ports by any means.
will measure the width of the port net time in garage and take a port map to show everything.
.