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Speed master bare heads ? 215 cc with 60cc chambers 2.050 and 1.6 valves gotta be trash? They are 320 each bare.
i figure for 1600 total I can have some great flowing high compression heads witj my choice of parts.
the other comparable option is 706 heads to the PRC , katech , TEA, ect for larger valves or 799s miller and thin HG (but my cam is 238/242 and Im not looking to fly cut.
I got a set of Mast CNC ported 243's that were pretty decent for $900, no core charge. Mast themselves were a total pain to deal with, but the heads were nice enough I would do it again. They come bate, but I can direct you to what hardware to put them together.
I'd do 706s CNC w/ 2" or bigger "IF" bore is 5.7-6.2 L sized, keep the 1.89" if your building a 4.8-5.3L.... Or if your building a bigger bore and can find 799's at a good price then go that way but they loose some compression vs 706's unless you mill them... 799's are if its a pure race and going to be over 6500 RPM most of the time, otherwise 706s are cheaper, flow as good or better than 799's till around 6k and .600" lift and will up CR vs the 799s... I only use 799s if its a big, high RPM engine but customer doesn't want to spend as much as maxed out aftermarket heads IMHO...
Look at the AFR Enforcer. Same overseas castings but the put quality parts on them. You can buy them bare too but they are more money than the speedmaster. Atleast AFR inspects the castings they sell...
Look at the AFR Enforcer. Same overseas castings but the put quality parts on them. You can buy them bare too but they are more money than the speedmaster. Atleast AFR inspects the castings they sell...
Just out of curiosity, what are the AFR Enforcers a copy of? I have a set of AFR Enforcers on an SBF and they are a copy of an SBF Dart head. In the Ford world the Enforcer Dart clone castings are sold under a bunch of different names, such as Procomp. All of which Im sure are cast in China but AFR uses the valvetrain stuff that they use on their name brand AFR heads. I dont believe the castings are cleaned up by AFR though.
i would trust a junkyard head over those, for reliability and power
How unreliable can a bare head be if good parts are installed in them? I can see being low on power if they dont flow very well but it seems like the reliability would come down to what valvetrain was used and who put the valvetrain in. Just like if you had a junkyard head rebuilt.
Just out of curiosity, what are the AFR Enforcers a copy of? I have a set of AFR Enforcers on an SBF and they are a copy of an SBF Dart head. In the Ford world the Enforcer Dart clone castings are sold under a bunch of different names, such as Procomp. All of which Im sure are cast in China but AFR uses the valvetrain stuff that they use on their name brand AFR heads. I dont believe the castings are cleaned up by AFR though.
I have no Idea what China used to model this casting from. If I had to guess, Its a 243 based casting with an LS3 type combustion chamber.
AFR does not do any Porting on them all they do is machine there logo and install the parts on them. The come from China with the guides and seats already installed and the valve job already cut. I was told by an AFR rep that they supply there own valve seat and guides to the company that cast and machines them. They supposedly inspect all the incoming castings and install there own good quality parts. My self and others asked them to come up with a small bore version or offer it with out the valve job so us DIY guys could machine them ourselves. Initially I was told it wasn't worth it for AFR. However a year later they were offered that way. I fell that's an excellent offering for people building 5.3L and 4.8L engines. So lets say the average 243's cost around $400 and its roughly $300 in work at the local machine shop to clean them up, check them and do a valve job on them. Now you need a decent spring kits... So lets say another $300 and this is assuming you don't need to replace any major parts like guides or valves. You can easily spend nearly $1000 on some stock castings with no additional work.
How unreliable can a bare head be if good parts are installed in them? I can see being low on power if they dont flow very well but it seems like the reliability would come down to what valvetrain was used and who put the valvetrain in. Just like if you had a junkyard head rebuilt.
doesnt mean the guides or valve seats were done well and if youre redoing those you could just buy good heads or totally redo stock castings at that price point
Look at the AFR Enforcer. Same overseas castings but the put quality parts on them. You can buy them bare too but they are more money than the speedmaster. Atleast AFR inspects the castings they sell...
yup right now I. Sale at kegs for 700 each too!
its pretty close to what I would pay for those Speedmaster heads. The Bear ones are 600. Valves are gonna cost me 300, and then springs and all the other craps that are 400.plus gotta pay to have them setup , the only advantage I get here is I get to choose the spring I want, and while theyre set up, I can have the shop and install powdered metal guides. Which is really the reason Im still considering it.
I appreciate all the responses. Ive given consideration to most of that. At the end of the day, my only concern is the casting itself. And I still think the casting is gonna be fine. Im gonna use my own parts.
I appreciate all the responses. Ive given consideration to most of that. At the end of the day, my only concern is the casting itself. And I still think the casting is gonna be fine. Im gonna use my own parts.
hope the guides and seats are okay, because if not at that point youll be into them for nice head money
How unreliable can a bare head be if good parts are installed in them? I can see being low on power if they dont flow very well but it seems like the reliability would come down to what valvetrain was used and who put the valvetrain in. Just like if you had a junkyard head rebuilt.
There could be porosity problems with the metal itself. The guides and seats could have fitment issues.
I've seen multiple times where the guides leaked oil between the guide and the casting. Valve seats that aren't concentric with the valve. The installed angle of the guide could be wrong. Poor guide material that wears out in only a few thousand miles.
Personally, I'd rework a used factory head, but then again, I'm cheap/ broke.
Alright , the fact that the guides may be installed I. China too has me running. So
e good points about CC here. Afr enforcers are probably the same castings as the soeeemastera BUT Afr probably rejects all the junk where as speedmaster takes all the crap.
funny cuz my local machine shop game me some junk work and I calle them on it and they tried to say they will redo it. No. You. Wont. Now they offering me a rusty set of heads to take elsewhere. My cores were good one I take valve has 25% leakage. This is how I got into this bare casting mess in the first place. I really dont wanna spend 2k on heads but prc 220 or pre ported 799s gonna be the win for me. The 799s after spring are almost 1400 and the prc as cast are 1799 on sale. I wish they had PM guides. TSP is hell bent that the CHE bronze guides are fine with factory rockers. Smh everything about Texas speed is great to me except that one statementstill deciding what Im a do
Alright , the fact that the guides may be installed I. China too has me running. So
e good points about CC here. Afr enforcers are probably the same castings as the soeeemastera BUT Afr probably rejects all the junk where as speedmaster takes all the crap.
funny cuz my local machine shop game me some junk work and I calle them on it and they tried to say they will redo it. No. You. Wont. Now they offering me a rusty set of heads to take elsewhere. My cores were good one I take valve has 25% leakage. This is how I got into this bare casting mess in the first place. I really dont wanna spend 2k on heads but prc 220 or pre ported 799s gonna be the win for me. The 799s after spring are almost 1400 and the prc as cast are 1799 on sale. I wish they had PM guides. TSP is hell bent that the CHE bronze guides are fine with factory rockers. Smh everything about Texas speed is great to me except that one statementstill deciding what Im a do
che are some of the best rocker trunnion replacements there are....you need to do a ton of research
Alright , after doing all the math I said fuxk it and got the PRC 225s
thanks everyone heart for your comment!
They will get me to 10.8:1 with .040 HG and with the 238/242 it should do pretty good.
I dont think Ill be disappointed. Im guessing 450 wheel with the ls6 intake and 42lb injectors.
Now the question is do u use my old howards tie bars lifters ?
They have maybe 4 hours of runtime , but came from a motor with a piston valve failure. Its possible the intervals of one of the lifters is filled ?
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Speed master bare heads ? 
