I'm looking at a set that are suppose to be 180cc intake, 63 cc chambers, 2.02/1.60 valves. Supposed to be pre '04. I can't find refernce to any 180cc intake runner TF heads. They're supposed to be perimeter valve cover heads with an exhaust cross over. Are these the "old-old" design that ate valve guides? Or something discontinued in favor of 195cc intake runners? F-Bird, you out there?

Looks like Summit still sells them, so they aren't out of production or anything...

TFS Twisted Wedge were the first ones that did have a guide problem. (ask me how I know this) They did have a runner volume of 185. The chamber and valve sizes are 63, and 2.02/1.60. TFS-31400001, is the part #.

If you can get them for a good price, get them, and get the guides replaced, with bronze guides, as I had done. The heads worked fantastic after that. I used them on my old 357, with a ZZ-9 cam. Car had a MPH of 107.

Also TFS are equipped with shorter length valves than other heads. You cant just go and get a Manley valve if you need a replacement. You have to get a TFS valve from Summit.

when I was looking for heads I found that TF Twisted wedge had a early style and a later style and then stopped all togeather and they only offer the trickflow heads (to twisted wedge)


the first ones would eat guides very quickly (almost right away!) this was with everything setup right

second ones were better but, as you stated they needed better parts and seemed to be ok at least much better than the first style however since they seemd like nothing but trouble they are no longer made well for the sbc that is


I found most of this info by just doing a search on this board so I guess I would only take half of that as fact

Thanks Guys,

Funny, I couldn't find anything on Summit's site about 180cc TFS heads.


The P/N that Brutalform listed is what the seller posted as well, that p/n doesn't come up on Summit or Trickflow site.

Seems like after adding new parts and taking them to the shop has to be considered.

Thanks again.

Summit just came out with these 180CC's Heads with smaller valves in favor of using these heads on 305's and 350's. Go to www.trickflow.com to find out more.

My bad. The new ones are 175cc. I dunno what hes talking about then. The 175's also have perimiter bolt holes and X over.

I dunno, I must be "search-impaired" or something, I can't find a 180 or 185cc runner TFS head on Summit either.

Funny, I couldn't find anything on Summit's site about 180cc TFS heads.


The P/N that Brutalform listed is what the seller posted as well, that p/n doesn't come up on Summit or Trickflow site.

Seems like after adding new parts and taking them to the shop has to be considered.

Thanks again. [/b][/quote] [B

I just so happened to have my old invoice from Summit ( approx. 8 years old), and that is the part # on it. They very well may be not avaliable any more. I remember the G2 heads coming out right after all the problems with the original ones.

Yea, now I rememebr all the talk about them, IIRC, some folks had good luck with havng different guides replaced, others still had problems.

Thanks for the update.

This is from the G1 twisted wedge heads

I know this thread is pretty old but I came across it when I was searching for info on these heads. I have a chance to buy a pair of the TrickFlow Twisted Wedge part number 31400001 for $500. Would it be worth it to buy these heads for that much or should I just hold out for some other heads? Gonna use them on my 400sbc. Also was looking for the valve guides just to see how much they run and I cannot find them on summit or on the trickflow websight all the have are the valve guides for the G2 heads, so I am thinking buying these would be a bad idea? let me know what you guys think, thanks.

I had the old G1 heads on a 400 with a 218/228 cam, Weiand Street Ram (7525) and 850 ad. The car was brutal through the midrange, but ran out of steam fairly quick around 5500 rpm (5800 rpm shift point). Still,, it was one of my favorite daily driver combos,,, smooth idle and instant throttle response.

He may or may not have replaced the guides already. While the guides gave many folks problems, I never had any problems with the guides. I did experience the main problem with the heads,,, a number of the K-Motion springs on MY heads broke. All the G1 heads didn't come with the K-Motions (they also used Manley and Crane - without problems),,, so some have bad springs to boot. The K-Motion have a tan stripe going down the side. If the heads you're looking at have those,,,,, budget for springs. Just an FYI,,, K-motion was still having trouble with these spring up until 1999,, don't know past that as I sold my speed shop and don't use K-motion products for the engines I build.

Anyway,, the heads are what I'd consider to be one of the best if not the best street heads available for combinations going to run dish or flat-top pistons and NEVER will run a cam over 230 degree duration and .530 lift on the intake side (roughly - depends on the lobe centerline). Any larger than that and you have to buy a special piston to clear the 13-degree intake valve. So you see they are somewhat problematic and depending on what you MAY have to replace on them,,, and MIGHT be planning to do with the engine/car (now or later),, they might not be that good a deal at $500.

Thanks for the quick response, the guy just had them at the machine shop to be checked out and they cleaned them up and told him everything looks good so I am going to buy them and see how they turn out. Thanks again for your help.

I ran those heads on my 355 for the past nearly 10 years and had no problems with the guides, just the springs that was said above. I changed out the springs for a set of Z-28 springs and could run that motor to 6300 rpm with no issues. I really like that motor combo and I am right now in the midst of a new 400 with Dart heads. A friend of mine bought my 355 complete to drop in his ride. Go for it I say..