you have to cut valve reliefs into the pistons, afr185 are the perfect head for small ci sbf with conservative hydrulic cam profile, 400-425 hp with streetable cam, 470+ with radical profile hyd roller but expect valve float at high rpm ( not good). upgrade to a solid roller and 500 is easily achievedI know on a 5.0, afr 185's won't clear stock pistons...you may want to look into thiis
i would recomend getting aftermarket pistons alsoyou have to cut valve reliefs into the pistons, afr185 are the perfect head for small ci sbf with conservative hydrulic cam profile, and pay attention to what size cumustion chamber you get. 400-425 hp with streetable cam, 470+ with radical profile hyd roller but expect valve float at high rpm ( not good). upgrade to a solid roller and 500 is easily achieved
i was woundering if i could run a set of afr 185s on a 289 until i am ready to build a 331? will these hurt my power too much? or would they still do me some good. I know this might seem like a dumb question but i was not sure if it hurt the low end if they are to large or what. any advice would be nice
I know on a 5.0, afr 185's won't clear stock pistons...you may want to look into thiis
you have to cut valve reliefs into the pistons, afr185 are the perfect head for small ci sbf with conservative hydrulic cam profile, 400-425 hp with streetable cam, 470+ with radical profile hyd roller but expect valve float at high rpm ( not good). upgrade to a solid roller and 500 is easily achieved
well crap that kinda sucks, but i was thinking maybe i will just take my grand that i have and turn my 289 into a 331 or a 347 for now and go for the heads when i save the money up again. i really wish i could buy them but from what it sounds like and the fact that they are actually 72 cc heads i would have to big of a risk and lose too much compression. So maybe i run a 331 or a 347 with the stock heads for a lil while. I can probably run it with my cam and such as its all aftermarket like my intake and just upgrade now. Im gunna go research which is better and such. Thanks guys!
If a valve won't clear a piston with stock eyebrows and 2.02, it won't clear with 1.90's. Even if you loose compression with the heads, you will still pick up overall. If you yo 58 now, the CR will be low. But a stroker and 14cc dish later will get you where you want to be. You aren't too far away right ? I can notch them here.
Even funnier, I do it for a living and have seen it. Saying 165 will fit without knowing what the cam is, is just as foolish as saying that a .630 cam won't fit, but a .540 will, when you don't know the valve timing of either cam. Your going to get people into trouble just telling them stuff will fit, just because it has a smaller valve. I'm not going to tell a manufacturer anything. They will tell you to still check the valves. Besides, they just want to sell heads. "Will clear pistons up to .600 lift without notching the pistons." Isn't that how it goes from TW ? Funny thing is, the piston is two and a half miles from the intake valve at full lift. So why would they tell you that ? The lift has NOTHING to do with clearing pistons. And valve size does matter. But a 2.02 may not clear, and a 1.90 juuuust might fit. But it's still too close. If a 2.02 will BARELY clear or hit, you shrink the valve by .12 to get a 1.90, you move if from the piston .006. That's a far cry from the standard .030 clearance recommended. One over rev and by by valves.It's funny you're the only one who thinks 1.9's don't clear stock pistons. You might want to let all the manufacturers know this.
Even funnier, I do it for a living and have seen it. Saying 165 will fit without knowing what the cam is, is just as foolish as saying that a .630 cam won't fit, but a .540 will, when you don't know the valve timing of either cam. Your going to get people into trouble just telling them stuff will fit, just because it has a smaller valve. I'm not going to tell a manufacturer anything. They will tell you to still check the valves. Besides, they just want to sell heads. "Will clear pistons up to .600 lift without notching the pistons." Isn't that how it goes from TW ? Funny thing is, the piston is two and a half miles from the intake valve at full lift. So why would they tell you that ? The lift has NOTHING to do with clearing pistons. And valve size does matter. But a 2.02 may not clear, and a 1.90 juuuust might fit. But it's still too close. If a 2.02 will BARELY clear or hit, you shrink the valve by .12 to get a 1.90, you move if from the piston .006. That's a far cry from the standard .030 clearance recommended. One over rev and by by valves.
Even funnier, I do it for a living and have seen it. Saying 165 will fit without knowing what the cam is, is just as foolish as saying that a .630 cam won't fit, but a .540 will, when you don't know the valve timing of either cam. Your going to get people into trouble just telling them stuff will fit, just because it has a smaller valve. I'm not going to tell a manufacturer anything. They will tell you to still check the valves. Besides, they just want to sell heads. "Will clear pistons up to .600 lift without notching the pistons." Isn't that how it goes from TW ? Funny thing is, the piston is two and a half miles from the intake valve at full lift. So why would they tell you that ? The lift has NOTHING to do with clearing pistons. And valve size does matter. But a 2.02 may not clear, and a 1.90 juuuust might fit. But it's still too close. If a 2.02 will BARELY clear or hit, you shrink the valve by .12 to get a 1.90, you move if from the piston .006. That's a far cry from the standard .030 clearance recommended. One over rev and by by valves.
Where did you see me tell him the 165's would fit with any cam ?Jumping to conclusions here aren't you bud ? .
D.Hearne said:Here's a solution: Go with the AFR165's. They have both a 58 cc chamber (the 185's also come in both 58 & 72) and 1.90" intake valves, so you won't have worries with piston to valve contact with your stock 289 pistons.
And where did I recommend anything with TW heads ? You're once again making ASSumptions here as you have in the past.
That was my point smart guy. If 2.02 will barely hit the valve pocket, and you go to a 1.90 valve, it only moves the vale in .006. So now with a smaller valve, that you recommended, it still doesn't have the required clearance. See my point here ? The smaller valve does not mean it WILL not hit. Which is what you claimed.It gains a little depth, but that's rarely a problem, ever.And .030 clearance is still cutting it close.
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