Summit Racing: Trick Flow® Twisted Wedge® Track Heat® series cylinder heads are capable of producing 600 plus horsepower on naturally aspirated engines-the winningest head in NMRA racing. Twisted Wedge® Track Heat® heads so dominated that the NMRA saddled them with a weight penalty! Twisted Wedge® Track Heat® heads include all of the features of the famous Twisted Wedge® series heads, plus higher-rate valve springs (125 lbs. seat pressure at 1.780 in. installed height), 10 degree machined steel super locks, and manganese bronze guides to support camshafts of up to 0.600 in. lift when used with the proper pistons. Track Heat® 170 heads with Fast As Cast® runners are perfect for dual purpose street/strip cars and for racers looking for the best combination of performance and value. These heads feature cast intake and exhaust runners with Twisted Wedge® CNC-ported profiles. You get near CNC-ported power and performance for the price of ordinary cast heads. Twisted Wedge® Track Heat® series heads work with most OEM and aftermarket intake and exhaust manifolds/headers. The heads are ready for installation straight out of the box. They come with stainless steel valves (intakes are backcut), 1.460 in. dual valve springs, locks, retainers, ARP 7/16 in. rocker studs, and guideplates. Bare cylinder head castings are also available.
I am not NA, running a blower, but I am well past that with the 170 heads. The heads are capable for sure. There are other heads that can do better, blah, blah, blah......there always are. It comes down to personal choice, money to spend, and the overall combo. Just match everything together that is proven to work well together vs guessing. Lots of models/examples to show this on the internet.
Here is a 347 combo with both sets of heads:
http://hotrod.automotive.com/131598/hrdp-1003-small-block-ford-heads/index.html
And moving on: The Twisted Wedge® 205 heads combine the proven power-building features of the Twisted Wedge® 170 heads with five-axis CNC-porting to give small block Fords an even bigger performance boost. When dyno-tested on a fuel injected 347 stroker mill, the Twisted Wedge® 205 heads made 50 more horsepower than the Twisted Wedge® 170 heads. That's power you can really feel! All Twisted Wedge series heads work with most OEM and aftermarket intake and exhaust manifolds/headers. I sure wish my car had these on it.
I have been checking this info out myself, cuz I may upgrade heads this winter.
