490 13:1

[FAQ654]

I was just wondering if anyone here has had any problems with a 490 kit with 13:1 compression.

[joe1l]

I'm looking at a similar kit, does anyone have one of these yet??

[chad502ex]

I've not seen anyone use this kit yet, but i would add that this would be the next best kit to the 500; especially, since there have been cylinder cracking issues on the larger 500 big bore on the stock jug.

[jeepnrocks]

who makes the 490 kit ?

[FAQ654]

I got mine from Gt Thunder. It seems to be working great but there is snow on the ground here so I have not really been able to feel any difference yet. The pistion is from J.E.

[jeepnrocks]

is it a different jug or is it just a bored out stock jug ?

[FAQ654]

Bored out stock jug!

[kazpr]

Ya next winter I will go with the 490 kit!!
13:1 and ported head that thing should rip!!

[jeepnrocks]

so how many mm bore is a 500 and 490 as opposed to stock

[chad502ex]

Originally posted by jeepnrocks
so how many mm bore is a 500 and 490 as opposed to stock

98 x 64.8 = 489cc

99 x 64.8 = 499cc

go to http://www.chad502ex.com
under tech talk section and use the displacement calculator

chad502ex.com

[savage_bob]

it might be a risk still I had my 500cc 13.5:1 cylinder sleeved because the wall thickness was only 2mm. This 490 kit will still leave a 2.5mm wall thickness with less comp it could be better/safer, but still pushing it?

Bigger gains would be had through higher comp, even with out going big bore.... not all people like going bigger, just 2 sides of a coin here. 13.8 stock bore has definate power gains, a 470/480 bore with 13.5 or 14:1 comp would be a good setup as well just more expensive. My $.02 invest in a setup that will burn race gas, more power is always welcome, and spend what you feel comfortable with both should make you happy.

[kgbg]

I like the sound of it. I am curious to hear the results.
What piston is GT using?
Savage, who did you have resleve your jug? Was it an aluminum sleve?

[the_hulkamaniac]

Hey Kam I keep forgetting when I'm at my bro's, that's why it's under savage. I finaly have my parts so hopefuly I get to build this weekend.

[mattonln]

just run 110 octane and you should be fine

[Punk'd]

Man I want a 490/500 kit down the road too. How much would they run me?

[FAQ654]

It cost me about $520 to put mine back togather with the 490 kit.

[joe1l]

what cam are you running ? is the power increase significant?