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Heads

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dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#536137
Yes the CB heads fell short too but were still very good, despite being an
"out of the box" head.

Hi Daimo,
It depends on you combo, but the ones we had struggled to fit .550 lift with no shims!
The accepted minimum is .060 form bind, but if you can set them at .100" the springs will like you for it.
The bare min shim will be a .015" to protect the spring eating the aluminium.
If you run into bind you will have to make some room by cutting the seat or facing the valve,
or changing the retainer. Most retainers can be machined(with a radius in the corner!!) to account for a .015" shim.
westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#536138
GB309E is my all time Fav with 1.4 or 1.5 rockers.
With good cyl heads it will not run out of steam.
westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#536141
Talking CFM, and 1/4 mile times, and HP, is very hit and miss when you are ordering heads.

To separate the salesmen from the experts,
tell the company what you car weight is, and what SPEED it has run on the 1/4.

Then tell him what speed you want to run.

If the engine is making the power it will run the MPH.

The ET can be worked on by optimising your combo.
westi wrote:That's mad Alan.

BiX Veteran Volks Folk

2,499 posts · joined Sep 2002 ·

#536208
Dangerous do you have any experince with the tighe cams, grind 148A? it has a duration of 253 @0.050" and lift of 0.509 with 1:4 to 1 rockers?
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 ·

#536235
Not a real fan of that profile with ratio rockers.
See what I posted on the other section.
westi wrote:That's mad Alan.