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Old 02-09-2013, 09:08 PM
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feel like i'm new to this. sorry man. back in the day 10.2:1 on pump gas was almost unheard of. but technology and advancements have come a long way. and the vortecs are supposed to burn effeciently. ok.

i have read that a 4.166 will create a dead zone, but it has also been noted as a tested and commonly used size. so, i'll go with it. greatly, greatly appreciate all your help. by far the most help i've found. thanks everyone.

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Old 02-09-2013, 09:21 PM
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had planned on 32-34 degrees already. also, not used to having a million different size head gaskets. not my first rebuild, but is first "real" build. just trying to get it right the first time. thanks!!!!
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Old 02-09-2013, 10:49 PM
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Quote:
Originally Posted by maxxman04 View Post
had planned on 32-34 degrees already. also, not used to having a million different size head gaskets. not my first rebuild, but is first "real" build. just trying to get it right the first time. thanks!!!!
Calculators:
Some use a negative number for a dish or valve relief, some use a positive number. BTW, the same discrepancies exist between various manufacturer's published volumes- some are negative, some positive for a dish or valve relief. Be sure of what the calculator you use calls for, and be sure of what the published figures are as well. Use the same calculator. The one I like is here, it states what to use (- or+).

You are looking to use as thick of a head gasket as possible, while keeping the quench distance within reason.

Dynamic is not voodoo, it can give insight as to whether or not to expect detonation from any particular combination. In your case, if the static CR is 10.15, the DCR is about 8.6:1 using the XE262H-10, which is at the upper end of what's recommended for pump gas.

You are correct on your total timing estimation of ~32 degrees max.

BTW, you do know you'll need self aligning rockers OR guideplates (just not both), and a Vortec intake, right? More on Vortec heads here.

Good luck.

Last edited by cobalt327; 02-09-2013 at 10:56 PM.
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Old 02-09-2013, 11:05 PM
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Quote:
Originally Posted by cobalt327 View Post
Calculators:
Some use a negative number for a dish or valve relief, some use a positive number. BTW, the same discrepancies exist between various manufacturer's published volumes- some are negative, some positive for a dish or valve relief. Be sure of what the calculator you use calls for, and be sure of what the published figures are as well. Use the same calculator. The one I like is here, it states what to use (- or+).

You are looking to use as thick of a head gasket as possible, while keeping the quench distance within reason.

Dynamic is not voodoo, it can give insight as to whether or not to expect detonation from any particular combination. In your case, if the static CR is 10.15, the DCR is about 8.6:1 using the XE262H-10, which is at the upper end of what's recommended for pump gas.

You are correct on your total timing estimation of ~32 degrees max.

BTW, you do know you'll need self aligning rockers OR guideplates (just not both), and a Vortec intake, right? More on Vortec heads here.

Good luck.

yea. i ended up getting an rpm performer with the heads. it is in fact a vortec intake. and yea. already ordered self aligning roller tip rockers for vortecs. goin with a 4.166 bore .041 thick head gasket. great info. thanks!!!!
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