Ported Viper with Cut SRX600 heads

the vipers center and mag domes are said to be 21cc. you must have measured the pto dome. i always measured 25.8cc to 26.1cc on the stock viper pto dome.....not saying its right, that's just what i got.
 
mopar1rules said:
the vipers center and mag domes are said to be 21cc. you must have measured the pto dome. i always measured 25.8cc to 26.1cc on the stock viper pto dome.....not saying its right, that's just what i got.
Click to expand...

LOL shit I think your right!!

Let me go check I comepletly forgot about the PTO side being bigger!

Damn well at least I know i'm not nuckin futs!
 
klrgreenis said:
LOL shit I think your right!!

Let me go check I comepletly forgot about the PTO side being bigger!

Damn well at least I know i'm not nuckin futs!
Click to expand...

DING!!
You sir are correct, that was the PTO side, so now it all makes sense.

OK so back to the original question, Since these are ~18.75CC would they be OK for ported heads?

I also noticed that the viper base gasket is 1 layer versus the 3 layer SRX does this sound correct?
 
viper and srx base gaskets are the same thickness. if you have 3 base gaskets on your srx, that was because someone was giving it what people call "a poor man's port job". the thicker base gaskets, advance the port timing. the 18.75cc heads may work, but i believe that would partially depend on how high the exhaust port was raised, how many base gaskets used, and the quality of fuel used. higher exhaust ports give you a lower trapped compression ratio.....lower exhaust ports vice versa.
 
klrgreenis said:
OK just tried this out using the above guide with some grease and plexi.

The SRX600 heads measured in at 18.75cc
BUT I also did the stock viper head and it measured in at 25cc..??

I measured filling the chamber and then measured again by drawing out the fluid.

So now i'm confused because I thought the viper head was 21cc <scratches head>
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WOW! That's a small chamber! DO NOT RUN IT!!!!!!
 
mopar1rules said:
viper and srx base gaskets are the same thickness. if you have 3 base gaskets on your srx, that was because someone was giving it what people call "a poor man's port job". the thicker base gaskets, advance the port timing. the 18.75cc heads may work, but i believe that would partially depend on how high the exhaust port was raised, how many base gaskets used, and the quality of fuel used. higher exhaust ports give you a lower trapped compression ratio.....lower exhaust ports vice versa.
Click to expand...


Those heads would give a "BOOM" Effect if used, lol. The stock Squish angle isn't steep enough, and the chamber is to small. I would imagine it has a tight squish. Although I don't think it was shaved .030", From my previous head work I would say it was shaved .010".
 
mopar1rules said:
viper and srx base gaskets are the same thickness. if you have 3 base gaskets on your srx, that was because someone was giving it what people call "a poor man's port job". the thicker base gaskets, advance the port timing. the 18.75cc heads may work, but i believe that would partially depend on how high the exhaust port was raised, how many base gaskets used, and the quality of fuel used. higher exhaust ports give you a lower trapped compression ratio.....lower exhaust ports vice versa.
Click to expand...

Yea that's what i thought, this was a "kit" I bought for my SRX600 when I had it, so that makes perfect sense!

Thanks!
 
98700 said:
Those heads would give a "BOOM" Effect if used, lol. The stock Squish angle isn't steep enough, and the chamber is to small. I would imagine it has a tight squish. Although I don't think it was shaved .030", From my previous head work I would say it was shaved .010".
Click to expand...

Yea my first thought was .010, and then I second guessed myself with the .030 so the .010 sounds about right.

I may just pop in a rear heat exchanger, the hauck cooling head gasket with the stock viper heads and call it a day...

In the middle of a rebuild and i'd rather ride than have a longer build with a few more horses :letitsnow
 
forgot to say that the elevation at which you ride, also plays a role in how tight of domes you can run, along w/octane of fuel, and squish angle. higher up in elevation you go, the tighter domes you can run.
 
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