11R Heads Questions

apierce

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Jul 30, 2019
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So I'm putting together a build hopefully soon and have started researching for my 302. I'm pretty dead set on the TF 11R Heads, and it says max lift of 0.600 but I'll be getting pistons with valve reliefs for the specific heads. Just curious if that really pertains the how much the valve springs can take involving bind and float, or if it's just a number based on assuming someone is using stock pistons. I'd like to go with a tfs2 cam, or maybe a stage 3 cam if that'll work with the setup without major issues (custom cam is better, blah blah) It'll be a track car with maybe some street use from time to time. So basically, can I go bigger than 0.600 lift if I wanted too without any serious issues, and are the springs with the 11R heads capable of such? Thanks, research is hard work :)
 
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revhead347

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Most likely the springs that come with the heads. I had a TFS3 cam, there are much better cams out there now.

Kurt
 

96pushrod

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The springs on the 11r can handle up to .650 lift. Tfs rates them on the low side.

For a 302 you really won’t need more than .600 usually though.
 

revhead347

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The springs on the 11r can handle up to .650 lift. Tfs rates them on the low side.

For a 302 you really won’t need more than .600 usually though.
I don't think it would be wise to spin a stock 302 block up high enough where you would make more power with a 0.600' lift cam.

Kurt
 

a91what

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Agreed.

a 57x lift cam in the 23x/24x duration with a 112*lsa will drive nicely and make great power, the 11R has great mid lift numbers use that to your advantage.
 
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96pushrod

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I forgot to mention I'll be stroking it out to a 331 btw, my apologies.
It’s still not going to make a whole lot of difference. Sub .600 lift is still good with the 11r heads for a stroked 8.2 block.

If you really get squirrelly the springs in the 11r will take more lift than they’re advertised. You can find the same springs on PAC’s catalogue and there they will spec out to .650 max lift.

It would be wise to check for coil bind if you go past .600 though. It’s never a bad idea to check whenever you install a cam though.
 
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