AFR 225's on a 346?
 

I was wondering if there were any issues with running AFR 225's on a stock displacement motor. Piston to valve, valve to cylinder wall? I was planning on running a cam in the high 220's low 230's. Is any one running these on your 3.900 bore?

Brett

Patrick G is doing this. I believe he only gained 5 horsepower over his previous 205's....but I believe he lost throttle response and fuel mileage. Quite frankly you would be better with 205's.

Hammer

Little to large of a cylinder head for a 346. 205 is all you need.

heads
 

sorry to jump in but i'm in the market for heads but from what i've seen like from ttperformance and even afr does say if you have a wild 346 with a big cam and lots of spray or stroked then use this one. i have 346 motor with the xx cam so i want to make as much power as possible, i was thinking about getting the trickflows or getting the afr 225 and porting them out even more or porting out the rhs heads i got this idea from racing prep engineering

225's would be great on a 346 race setup but the 205's with a mild cam on DD car is more than enough.

i'm already use to my cam it has nothing down low its a top in package my cam starts shining around 2800-7500

I was referring to the original poster. For yours, sounds like the 225 will be fine.

ok good my bad

hopefully 228/232 range on cam. 225's will do the job, but from the way the 205's have been performing, there hard to beat. i think most of the 205's people are using have been ported.

There are ton's of results on the 205's. LG went a 10.4 at 141 mph in their race vette (2950 lbs) with a 346 CI and 205's out of box some time ago. The 225's will shine more on a large bore setup. Look at this thread https://ls1tech.com/forums/dynamometer-results-comparisons/384450-383-engine-dyno-results-graphs-included.html. Lots of good info/testing in here from Tony.

Dan

your piston might come very close to your cylinder wall. i'd worry about rings rubbing. :lock:

Thanks for the imput guys. I went with the 205's. I don't think any thing N/A is going to feel fast right now. I just had to sell my FI combo that was making 635rwhp to finance my new motor. I think the 205's are a great choice right now. The car will be a mid size cammed daily driver. I can port them later and grow if I want to put more motor under them. A few friends of mine are having great results with the 205's on stroker motors as well.

67RS. I just realized that I put Piston to Cylinder. I think I do want that. I meant Valve to Cylinder but I am sure you already got that.

The key words are "wild 346" amd "stroked". A "wild 346" isn't your average 224 through 232 Intake duration cammed motor. We are talking darn near balls to the wall race 346, not a street motor. And then there's "stroked"...it's not a 346 any more if it's stroked.

Hammer

good decision on picking the 205's, you will be happy.

I'm looking at the same heads. AFR 205 or AFR 225. I was thinking the 225's over the 205's. I am using nitrous, 150-200 shot. Anyone have any results with these heads and nitrous?

I have a forged 346 I built mainly to take spray, it has a fast 90 as well.