Milling Stage 2 ported heads .035" > Any problems?
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From: SW Florida
Milling Stage 2 ported heads .035" > Any problems? I plan on having a set of 5.7L Stage 2 heads with 1.57"/2.02" Ferrea valves milled .035"
This will be with the stock GM head gaskets.
Do you see any problems with this head combo when used with a TR-220 cam?
I understand the CR should be about 10.6 to 1
Does this sound about right?
Thanks,
Ron
This will be with the stock GM head gaskets.
Do you see any problems with this head combo when used with a TR-220 cam?
I understand the CR should be about 10.6 to 1
Does this sound about right?
Thanks,
Ron
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From: new england
Re: Milling Stage 2 ported heads .035" > Any problems? Yes on both questions, i used stock length pushrods before and after switching to heads shaved .035" with no valvetrain issues. This was with comp grind similar to TR 220.
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From: SW Florida
Re: Milling Stage 2 ported heads .035" > Any problems? Your up early on a Sat morning!
Not me, it's 9:45 Saturday night over here.
Anyway, somebody measured the base circle on his TR cam a while back and came up with a 1.492” across the lobe distance. That would work out to be 0.746” centerline to heel distance. Thats .030” less than stock.
Jason at Thunder is going to measure a TR-220 with a micrometer and get back with me. I would bet that the centerline to lobe heal distance is just about .030" less than stock too.
Milling the heads .030"- .035" would then bring the lifter preload right back to about stock.
In fact, I already purchased a set of Thunder 7.40" stock length rods.
You don't think milling .035" off the heads is any too excessive do you?
Ron,
Not me, it's 9:45 Saturday night over here.
Anyway, somebody measured the base circle on his TR cam a while back and came up with a 1.492” across the lobe distance. That would work out to be 0.746” centerline to heel distance. Thats .030” less than stock.
Jason at Thunder is going to measure a TR-220 with a micrometer and get back with me. I would bet that the centerline to lobe heal distance is just about .030" less than stock too.
Milling the heads .030"- .035" would then bring the lifter preload right back to about stock.
In fact, I already purchased a set of Thunder 7.40" stock length rods.
You don't think milling .035" off the heads is any too excessive do you?
Ron,
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From: new england
Re: Milling Stage 2 ported heads .035" > Any problems? I have run both preload settings and had no issues with noise, valve float or lifter pump up.
My preload was .039" less than stock cam with 7.400" pushrods just as a point of reference. I have no knock issues with 10.6 to1 compression on 93 octane, even with Hpp3 power tune no problems. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
My preload was .039" less than stock cam with 7.400" pushrods just as a point of reference. I have no knock issues with 10.6 to1 compression on 93 octane, even with Hpp3 power tune no problems. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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From: new england
Re: Milling Stage 2 ported heads .035" > Any problems? I have run both preload settings and had no issues with noise, valve float or lifter pump up.
My preload was .039" less than stock cam with 7.400" pushrods just as a point of reference. I have no knock issues with 10.6 to1 compression on 93 octane, even with Hpp3 power tune no problems. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
My preload was .039" less than stock cam with 7.400" pushrods just as a point of reference. I have no knock issues with 10.6 to1 compression on 93 octane, even with Hpp3 power tune no problems. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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From: new england
Re: Milling Stage 2 ported heads .035" > Any problems? Ron i allready answered yes to the compression question up above.You will have between 10.6 to 1 and 10.7 to 1 with .035" off head surface. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
