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Old 08-21-2010, 11:15 AM
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SBC Dart Pro-1 215cc Heads - which valves?

I recently purchased a pair of these heads (bare) and have seen conflicting advice re. valve length. The supplier I purchased the heads from state +.100" required, yet looking at a Dart spec sheet for the Platinum heads (which these are NOT), they specify +.100" valves are required only if 1.550" springs are used. I'll be using Comp 986-16 springs (1.430"), so I'm now thinking that stock length valves are needed.

Can someone clarify please?

Thanks.

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Old 08-21-2010, 11:36 AM
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This is a tough call, spring is listed as 1.800" installed height and puts you right at the point it could go either way, depending on spring seat or cup thickness, retainer style and valve lock ledge location. Standard length may leave you without enough room to get the spring height spec and then searching out higher retainers and plus height locks, which can sometimes lead to rocker arm interference with the retainer. A +.100" valve would give you room to juggle the other way, shimming under the spring seat or cup and/or using minus height valve locks to dial it in.

I myself would go with the +.100, and IIRC all the Dart Pro heads with larger than 1.250" stock diameter springs come assembled with +.100 valves,... at least all the Pro-1's and Iron Eagles I have touched are that way. Sportsman II's also.
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Old 08-21-2010, 11:42 AM
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Have you ever been to the Dart website. They have a page devoted to answering tech questions if you don't want to call them. They are very good at answering quickly. Don't you think it would be best to call Dart about this? I know that is what I would do.
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Old 08-21-2010, 11:55 AM
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Quote:
Originally Posted by ericnova72
This is a tough call, spring is listed as 1.800" installed height and puts you right at the point it could go either way, depending on spring seat or cup thickness, retainer style and valve lock ledge location. Standard length may leave you without enough room to get the spring height spec and then searching out higher retainers and plus height locks, which can sometimes lead to rocker arm interference with the retainer. A +.100" valve would give you room to juggle the other way, shimming under the spring seat or cup and/or using minus height valve locks to dial it in.

I myself would go with the +.100, and IIRC all the Dart Pro heads with larger than 1.250" stock diameter springs come assembled with +.100 valves,... at least all the Pro-1's and Iron Eagles I have touched are that way. Sportsman II's also.
Great info, thanks. I'll stick with the +.100... what you say definitely makes sense; it's easier to shim than to be stuck with insufficient installed height to start with.
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