UnderCover89TBI

iTrader: (25)

a cnc combustion chamber vs non cnc is it really worth the extra money on a street engine for the cnc chamber? what are peoples opinion do you pick up horsepower with the cnc and are we talking signifigant or minimal?

UnderCover89TBI

iTrader: (25)

mod can you move this to power adder section I think it'd be better suited there. my bad.

ASE doc

CNC chambers are good for a few ponies on a max effort race motor. Key reasons for chamber clean up is preventing hot spots for detonation resistance and to improve mixture motion for best quench. A machinist may use CNC to match chamber volume as part of blueprinting. Much better ways to spend your money on a hot street motor.

This thread doesn't belong in power adders. Power adders is for nitrous and supercharger questions.

CNC porting is good when you start getting over .500 inch lift numbers. Port work gets you more bang for the buck.

NagleMac

iTrader: (1)

For a street motor I wouldn't even worry about it. It might give you a few ponies but not anything noticable. Now if you have a lower quality head where the chambers arent very uniform, then i can see getting them cnc'd at a machine shop.

UnderCover89TBI

iTrader: (25)

yeah it is trickflow and just the combustion chambers so we are talking like 300-400 dollar difference for that. didn't think it was worth the money unless trickflows are known for being horrid which i have not read about

Orr89RocZ

iTrader: (20)

If you wanted to you can clean up the chambers yourself. Unshroud valve if necessary, clean up the bowl where the seats were cut. For trickflow i would never spend 300-400 on cnc chamber option. Id put that towards better valve springs and or custom cam to extract what i can out the heads. Or mild hand clean up port work to the as cast casting, as a good porter can get nice gains with minimal work

Depends tho on the motor. 375 crank hp build doesnt really need a trickflow 195 casting. A 500 hp one would benefit with mild work

NagleMac

iTrader: (1)

I just bought some trickflow super 23s with the 62cc non-CNC'd chambers, and they look like a VERY quality piece.

Check it out undercover:

https://www.thirdgen.org/forums/engi...383-build.html

UnderCover89TBI

iTrader: (25)

So 195s are too big for a 'mild' build? That's what I was kind of on. But they don't offer 180cc anymore...I could get some used twisted wedge 180cc but I bought used heads before and I kind of don't wanna go that route. This is also my daily driver for now so it is a lil rough to pick a proper combo

NagleMac

iTrader: (1)

If youre still rocking a 305 they might be a little big, but i dont see a problem with that, i dont think it'll hurt anything, youre just not using them to full potential. 195s were a conservative pick for my build, mostly based on price and the fact that i want a lower powerband with a lot of torque, not really a high reving ponypower beast

Orr89RocZ

iTrader: (20)

I wouldnt put the 2.02" valve 195's on a 305. It wont fit the valve. Need the smaller 175 cc casting for 1.94" valves

And you can use a small cam large head combo just fine for milder hp setups. Its not considered optimal but does work well sometimes. Guys use 195 heads from all the major manufacturers on all kinds of 350 builds from 300 whp to 450 whp.

NagleMac

iTrader: (1)

Good point, i didnt even think of valve size. Maybe look at some jegs or summit brand heads? Theyre supposed to be decent quality

UnderCover89TBI

iTrader: (25)

it'd be on a 355 not a 305

UnderCover89TBI

iTrader: (25)

I feel alright about buying the 195 trickflows now. Then later if I decide to go 383 I will have heads that can feed it too.

NagleMac

iTrader: (1)

Oh then those will be a pretty good head to put on the 355. Like i said, 195s are a more conservative choice for me, I could have run 210s with 1.6 rockers and got much better results, but price was a big factor. I think youll be happy with those heads on a 355

Orr89RocZ

iTrader: (20)

All depends on your rpm and power goals. 400 whp seems popular around here for a target. A good 195cc head will get there on typical 350-383 builds. 6500 rpm. You want much more of either rpm and or power, need to start thinking bigger area ports

UnderCover89TBI

iTrader: (25)

yeah that is where I am at. sounds good. i feel good about the 195s now