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Thinking about swapping heads
I’ve been toying with this idea for sometime. The current heads are TMS CNC 317s at 69cc. I believe the intake is 235cc. I procured a set of 243s. I want to have them gone through and milled down to 59-60cc, which bumps my compression up quite a bit. Here’s the hard question, is it going to run better or worse? Anyone have any thoughts? |
So, I'm moving forward with this.
I am going to mill the 243s .025, run a .051 gasket. I should be around 11.5-11.8cr. Thoughts? |
Doubt it will hurt it. Just don't expect huge gains.
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With no port work? Don't be surprised if you lose some power on the top end.
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Originally Posted by 1FastBrick
(Post 5440830)
With no port work? Don't be surprised if you lose some power on the top end.
On top, it pulls like a damn freight train. 3rd gear, from 80'ish to redline (6500) it holds a rock steady 12.5-12.7 afr. Would it be better to to swap head gaskets? Even with a calculator, going from a .051 HG to .027 (Cometic) only bumps up the compression to around 11.5. I also understand that this will tighten the quench up and my DCR goes from approx 9.1 to 9.7. |
With the higher compression it should feel way better at low rpms and still perform at high rpms.
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Your quench will probably be too tight with a gasket that small.
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