Has anyone attempted or successfully pulled off doing a .020" or .030" big bore on their 3800 engine?
If so, what was your approximate horsepower gain, and what pistons did you use?
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04-23-2014
Has anyone attempted or successfully pulled off doing a .020" or .030" big bore on their 3800 engine?
If so, what was your approximate horsepower gain, and what pistons did you use?
04-23-2014
I think there's been a few and it ends up being like a 4.2L or something, not really sure on the horse power or anything like that though. Just look it up on google, there used to be someone who had a kit put together for it I think, that or it was like a stroker kit or something.
04-23-2014
Here's a link t someone who was successful with it, but it's from back in 2009.
http://www.thechicagogarage.com/foru...2-stroker.html
04-23-2014
After the time, money and gains etc wouldn't be worth it. There's others things that will do more for you and cost you less.
04-23-2014
red winter is over i dont think he wants a coat
Originally Posted by Bio248
Originally Posted by Kilroy
04-23-2014
Damn autocorrect
04-23-2014
was thinking thats what happen so i wasnt trying to be to hard on ya cuz that does happen to everyone
Originally Posted by Bio248
Originally Posted by Kilroy
04-24-2014
Come on now 3.8 is gay, 4.2 is where its at.
04-24-2014
MCbatt - thanks for the link
ITHURTZ - no replacement for displacement eh? haha
04-24-2014
for the money i would turbo the stock motor and make twice as much power
04-24-2014
To do something crazy you could grab a vortec 4.3L, throw in a 4T80 trans and then turbo it. Might need an adapter plate for the trans. Would be different for sure.
04-24-2014
Well to do the work myself, the parts and machine work would only cost $1500 or so, and I believe a turbo costs around $3000 or so? Correct me if I'm wrong.
Overall, I wouldn't mind having a turbo on there - more immediate power is always nice, rather than building up the supercharger.
04-24-2014
Labor and money going into a stroker build would be more expensive than a turbo.
04-24-2014
I would have went with a 4.2 stroker but the only companies I found that offered them were in Australia and they wanted way too much for them
04-24-2014
20 overbore gives you what like 2 extra cubes at most.
the stroker kits are not worth it unless you have a SI tall deck motor.
the SII already has horrible rod/stroke ratio from stock....why make things so much worse.
a tiny turbo on a bone stock 3800 will break most transaxles.
04-24-2014
My motor is .020 over, made the holes round again and gave me a nice fresh cylinder wall finish. Speedpro/Sealed Power hypereutectic pistons with ceramic coating. As stated above over bore of .020 - .030 gives such a negligible difference in displacement you would never realize any measurable gains in output. A C.O.M.E 4.2L stroker kit with a completely custom rotating assembly might. However at $3k for rotating alone not including machine work, valve train, heads, assembly labor, big blower or anything and everything else needed to utilize the setup. A turbo is a much smarter option
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