ascott 500 head swap onto a 350x.... with pics

[scrawny]

i do know a guy with a new atv dyno....hmmmmm

let me be the first to guess...

im going to say 44 hp. ever figure out what compression its going to end up being?

[SWIGIN]

yeah im useing a 10.25 or 10.5 ( whatever they call it)


since the piston is made to be used with this head im thinking the addvertized compression ratio should be right


im keeping the comp low and the cam on the small side to lenghthin the fuse on this time bomb...lol


you might be real close on the hp guess ...... we will see

[Dirtcrasher]

All nice stuff SWIGIN!!

Funny though, this just proves what BS is out there. How many of us have read that the "ascott swap" just needed a few minor mods to get it to fit. LOL... Turns out it takes big mods, allot of machining and plenty of brains. At least you have posted it for us all to know what is truly involved in this swap.... Thank you.

[NOS_350X]

Quick question, for you Swigin, Is a ascott 500 cam a drop in for a 350x?

[SWIGIN]

Quick question, for you Swigin, Is a ascott 500 cam a drop in for a 350x?

i would think so....i have a xr500 cam witch should be the same as a ft500 and it fits perfect in the 350x head


edit..... on second thought i know its a direct fit

[SWIGIN]

All nice stuff SWIGIN!!

Funny though, this just proves what BS is out there. How many of us have read that the "ascott swap" just needed a few minor mods to get it to fit. LOL... Turns out it takes big mods, allot of machining and plenty of brains. At least you have posted it for us all to know what is truly involved in this swap.... Thank you.

thats 100% why i posted all this

its crazy all the crap out there you hear about this swap.........now get to work....lol

[scrawny]

about the cam swap:

do the pistons deck out the same between the 500 and 350x? you might run into piston/valve clearance problems. just a thought...

[SWIGIN]

the 500 piston pin is like 3mm lower then the 350x so the piston is higher but powroll knows this and shrinks the rod the extra amount.

if you had a old streched timing chain you could also run a 3mm cyl spacer


in other words my 500 piston will be as the 350x highth and lower then the 500 highth so valve clearence will be nothing to worry about

[scrawny]

no i meant running just the 500 cam in a 350x, like NOS said.

[SWIGIN]

it will work since the xr500 cam is not much different then a stock 350x cam spec wise


stock 350x specs... .313 .303 lift 221 221 dur

i dont have stock xr500 cam specs but here is mega cycles smallest drop in cam

.333 lift 234 242 dur

i would think a stock 500 cam is not even that big

now heres the 350x race cam iv used in the past

.405 lift 249 dur.... with any cam you need to check for clearences



but whats so nice about this head swap is i can use all the xr500 cams without any special clearnceing other then the normal need to maybe shorten the guides and check piston clearence

if you want to see the 2 cams im thinking about its megacycle #144-20 and #144-21 but im leaning toward the smaller #144-20

[scrawny]

good info to know!!

ya got me lol! ive only got the biggest web cam which is as follows: .392 lift and 279 duration. runs good likes to rev. especially with the relatively small 82mm wiseco and a stock stroke.

[The Goat]

is any other topend just a bolt up? machining the cases if the sleeve doesn't fit, but besides that.

I'm doing a highlift cam, but i'm curious about air flow, seems like it would benefit from a lot more.

[SWIGIN]

is any other topend just a bolt up? machining the cases if the sleeve doesn't fit, but besides that.

I'm doing a highlift cam, but i'm curious about air flow, seems like it would benefit from a lot more.

sorry man, im not following you

this dont just bolt up if thats what you mean, and you dont think this head will not give enough air flow?

[The Goat]

lol...if you calculate when that post was written you'll see it was at a very random hour. I've been up since....jeez...uh 2 p.m. thursday. exams this week.

your headswap is perfect, but, it's also a bit more labor intensive, and expensive than i was looking for.

[Dirtcrasher]

I think GOAT was asking if any other larger topend was close to a bolt on a 350X with maybe some case work but not all the intense work - drilling/welding/fabricating that goes into this ascott head swap.