Finally getting around to rebuilding a large log for my 200. I've been scheming with Bill (WSA11) and do have a pretty mild crane cam 265/275 intake exhaust at 194/202 duration. Milling for 9.5:1 compression (.070 off) and backcutting the valves. probably leaving the stock 250 valve size. What I do need are some valve springs that will work for this thing. Who can point me in the right direction? thanks!
All Small Six Valve spring help needed
- Thread starter sefus
- Start date
This relates to all small sixes
Selecting the Proper Valve Springs
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Selecting the Proper Valve Springs
Selecting the Proper Valve Springs Valve springs are one of the most critical components of your engine. It is very important to match the camshaft and it's potential RPM range with the correct spring rate. We will attempt to explain it in this...
fordsix.com
How much valve lift at what rocker ratio?
What does the cam maker say, have for their cam.
What does the cam maker say, have for their cam.
The closest I can get is by using the
Comp 903 valves springs and using the PAC L8149 keepers to move the retainer up .050”.
At an installed height of 1.675”, the seat pressure will be 87 lbs.
They are specifying a spring rate of 271 lbs/in
The Comp 903 springs have a rate of 293 lbs/in.
The Comp 903 springs fit the stock retainers.
You will still need to measure the present retainer height to verify the installed spring height.
Comp 903 valves springs and using the PAC L8149 keepers to move the retainer up .050”.
At an installed height of 1.675”, the seat pressure will be 87 lbs.
They are specifying a spring rate of 271 lbs/in
The Comp 903 springs have a rate of 293 lbs/in.
The Comp 903 springs fit the stock retainers.
You will still need to measure the present retainer height to verify the installed spring height.
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Why is this a bust?
I thought it was a very good solution.
Here's what I'm asking you to measure;
If your head has the same retainer height as the 250 head in the picture, then the Comp 903 spring and Pac + .050" retainer will give you the "spot on" spring pressure shown on the cam sheet.
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