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Hi lads. I'm chasing flow figures for a stage 4 YT head for a red motor. I've called YT and a thousand head reco/port shops but the best answer I have to date is 25-35% above standard? What's standard? I'm going crazy.

Most of the shops said they "haven't touched 'em for years"

Does anyone have any numbers/estimates from back in the day?

I think I was born 30 years too late - I've missed the boat

Cheers
Jim

This topic has been moved to [link=http://www.fefcholden.org.au/cgi-bin/yabb/YaBB.cgi?board=howto;action=display;num=1155125107;start=0]General Technical[/link] by stinky.

This is a good question Dave

Hi lads. Myself and Dave (aka Dave_EH) are planning a cam change including a conversion to straight cut timing gears on a 186. Being young and wet behind the ears we are in need of a little help regarding finding TDC.  

Assuming that the harmonic balancer hasn't slipped, should the harmonic balancer mark be at the long timing mark on the block before the cam is removed? We are assuming that the long timing mark is standard timing which is 6 degrees so is that really TDC? The “screwdriver down the spark plug hole” method has been suggested but we are dubious about its accuracy.

To further complicate the issue, the new gears enable cam advance/retardation adjustments to be made without removal cam removal…….apparently

Any help would be much appreciated.

Cheers
Jim â€" attempting to live the dream.

Hi lads. Just thought I'd introduce myself. I'm good mates with Dave_eh and thought I'd join to hopefully make some useful contributions and learn a thing or too. He has been harping on about the quality of the information and how keen people are to help each other out.

Anyway, I have a LX hatch with triple SU's, not quite an fe/fc but running a red motor none the less.

Cheers
jim

How did the old/new carb go?

I think you'll find Megs is happy now that stuff has been moved. Nothing will stop our collection of old Holdens now, nothing.