View Poll Results: 10.75:1 or 11.5:1
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11.5:1 Cr?
04-29-2009, 10:00 PM
#42
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Where were you when I couldn't even get anyone to commit to a 228R with 59cc heads and 2.055 intake valves! We did have a ton of clearance with the VRX3, but a lot of people start looking at cutting in the low 23x range. Milled heads make it worse. I would measure before flipping the key over...
04-30-2009, 05:00 AM
#43
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My new cam choice 224/230 .581/.588 114LSA. I'm thinking about milling my 5.3L head to 60cc. Bcuz of the shitty gas in CA can't run too high CR without KR issue.
05-01-2009, 02:14 AM
#46
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always always measure. i have 2nd hand experciance. my buddy decided to take texas speeds advice when they told him his PRC heads would clear no problem with his cam, well. they were wrong. i'll see if i can find the pictures, but it was a mistake that cost him 4000 bucks or so. honestly, just fly cut. just plan on it. plus you can get more compression that way anyways. big cam + big compression = 
05-02-2009, 02:38 AM
#47
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always always measure. i have 2nd hand experciance. my buddy decided to take texas speeds advice when they told him his PRC heads would clear no problem with his cam, well. they were wrong. i'll see if i can find the pictures, but it was a mistake that cost him 4000 bucks or so. honestly, just fly cut. just plan on it. plus you can get more compression that way anyways. big cam + big compression =
05-02-2009, 03:26 AM
#48
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Ok, guys new project for my friend.
I'm doing a cam swap for him. It's a custom Comp cam 228/232 .588/.591 112LSA. Original plan is cam swap only, now he wanna port his 241 head (Stock valve) too. He'll be using stock NON-MLS head gasket. According to previous post, 241 is 67cc. If I ask the machine shop to mill the head .020, will this cam still clear PTV? If I do the math right, after the mill it should be 64cc just like the 243. It should clear no problem.
Also from another previous post that use modeling clay to measure PTV clearance, is there other way to measure it? I've the 241 out of the engine already.
I'm doing a cam swap for him. It's a custom Comp cam 228/232 .588/.591 112LSA. Original plan is cam swap only, now he wanna port his 241 head (Stock valve) too. He'll be using stock NON-MLS head gasket. According to previous post, 241 is 67cc. If I ask the machine shop to mill the head .020, will this cam still clear PTV? If I do the math right, after the mill it should be 64cc just like the 243. It should clear no problem.
Also from another previous post that use modeling clay to measure PTV clearance, is there other way to measure it? I've the 241 out of the engine already.
05-02-2009, 03:57 AM
#49
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it SHOULD be ok, but honestly just check it. it takes an extra 10 minutes when you're doing the heads anyways... all of us on here could sit here and say YA YA! ITS GONNA WORK GREAT! but your buddy isn't gonna be happy with you if something DOESN'T work out. i know how it goes, I've built cars with/for numerous good friends of mine. i always treat them as if they were a customer, and would feel horrible if something went catastrophic because i told them how awesome this new cam would be.
05-29-2023, 02:23 PM
#51
Im looking into building my first engine. LQ9 flat top pistons zero deck, TEA 243 heads milled, 228r 112lsa or BTR stage 2 cam, Johnson lifters to rev out to 7k-8k. looking to get a .041 gasket quench to get me around 11.3 cr. How much cr is to much for 91 pump? Build would be on C5 mild street with occasional track
05-29-2023, 05:51 PM
#52
Staging Lane
Start a new thread please
06-08-2023, 12:49 AM
#53
Im looking into building my first engine. LQ9 flat top pistons zero deck, TEA 243 heads milled, 228r 112lsa or BTR stage 2 cam, Johnson lifters to rev out to 7k-8k. looking to get a .041 gasket quench to get me around 11.3 cr. How much cr is to much for 91 pump? Build would be on C5 mild street with occasional track
If you’re going to throw nitrous on top run a stand alone and either run VP Racing 109 or C16.
