I'm debating on either getting the TFS Twisted Wedge heads or the Edelbrock Performer RPM heads. What have you guys used and how do you like them? The TFS heads need differnt length pushrods right? What length pushrod is needed with them? Will the 2.02 RPM heads work with my stock pistons or will I need the 1.90 version to clear the pistons? Stock '72 short block. Also I plan on using a Voodoo cam with; advertised duration: 262/268, duration @ .050: 219/227, lift: .499/.522, LSA/ICL: 112/108, rpm range: 1400-5800rpm. Will them heads and that cam work well? thanks, Jon
summit has a complete RPM top end kit, that i am going to get. i have heard that the RPM heads work great for our cars. havent heard too much about TW heads..
i like twisted wedge a whole lot more than performers but thats JMO but i dont have either , but if i had to choose i would go with TFS
I would go TFS myself. I have never heard about the pushrod thing??? Seems like a small detail though. If you think about it, every engine should pushrod length checked and proper length ordered. There are MANY variables that affect that. Even production tolerances... The square heads, like Edelbrock, cannot run 2.02s on a stock engine. The twisted heads are angled enough to allow 2.02s as long as the valve lift is sane. Good luck Dave
Yeah I was leaning toward the TFS heads, but I've heard they wear out valve guides quickely. I like the RPM's because the bolt holes are already heli-coiled. Will the TFS heads work with the cam mentioned above?
Depends on what you're doing. A good example of what not to do would be putting a set of fully hogged Yates heads and matching intake on a stock '73 302. We have 2 cars with RPM heads. Dad's fairmont and my '84 Mustang. Both run 6.80's in the 1/8 in good air, and they're an excellent choice for a mildly built street/strip car. Ported, they will work a lot better of course. Dad could stand a little better set of heads on his 347 but it's what we can afford, so they'll stay on there. I would suspect at least a .3 improvement in ET with a set of heads that more closely match the rest of the car. That said, they're hard to beat. TFS makes nice stuff, but keep in mind that the valves are angled differently than on standard inline-valve heads...which can throw you a curve if you plan on using any kind of camshaft.
I assume the stock '72 pistons are dished enough for valve/piston clearence with the TFS heads and the Lunati voodoo cam; 262/268, duration @ .050: 219/227, lift: .499/.522, LSA/ICL: 112/108, rpm range: 1400-5800rpm. Right? The 2.02 RPM heads will not work with my pistons but the 1.90 ones will, correct?
i have heard that a .512 is the highest lift on a stock engine.. make sure you use some clay to check clearances
A pretty good engine builder once told me the TFS heads are the best flowing head for cams under .550 lift for the money.
You should read up on the heads, but I believe TFS says they are good to around .550" lift before pistons need work. Your cam is well under that, and then the LCA is not aggressive at all. That can make a big difference in piston/valve clearance too. IMO you are okay... but check with TFS. The .512" for stock engines is a general figure for stock heads (before using screw in studs), not the TFS valve/piston clearance. Personally, I won't go over .500" on press in studs, even though they say you can. 1.90" valves are good on stock engines well over .500" lift from my experience. I had 1.94s in stock iron heads with around .550" lift and no piston issues.
