5.5 or 6.0 High Compression Head?

[BRENT in 10-uh-C]

Originally Posted by Henry's Lady's Man

The two Snyder heads (5.5:1 and 6.1:1) do have slightly different shapes for combustion. I have only experience with the 6.1. I would suggest you repost it as a separate question or contact Snyder's. They probably get the most feedback.

FWIW, I am pretty sure it was Bill Stipe that flogged the 6:1 head for Don Snyder. For those that know Bill, that in itself should be the "proof" right there.

[Del in NE Ohio]

Check out the dyno results on Snyder's website. The two heads on an otherwise stock engine show minimal advantage of 6:1 vs 5.5:1. When you start making other modifications (valve timing/cam, increased fuel air mix via carb set-ups) the gap between the two designs widens considerably.

[Bob C]

They show it as 6:1 on their web site. http://www.snydersantiqueauto.com/ca...mpression-head

Bob

[captndan]

Originally Posted by CarlG

I would put new studs in with any new head -- regardless.

This is just common sense. Like replacing the head gasket at the same time. Or buying reclaimed oil.

[Tom Wesenberg]

Originally Posted by captndan

This is just common sense. Like replacing the head gasket at the same time. Or buying reclaimed oil.

About 1977 I bought a quart of reclaimed oil for my Corvair, and I swear it came straight from a semi's drain pan without even filtering it.
Never again.

[George Miller]

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Back in the day in My Dads repair garage, people use to come in and get used engine drain oil.

[Mitch//pa]

How far we came.. Now I burn it for heat..
Used motor oil WANTED

[George Miller]

There use to be a gravel road going up a hill next to the garage. We used use oil on it to keep the dust down. Would not want to try that today.