Would you mill an ecotec head?
Shit's getting real here, and I'm wondering about milling my head for an increase in compression instead of having some one-off pistons made. This is a common option for SBC builds. I'm doing this very thing on my 307X build for my Nova. Is this a viable option for this car? Why or why not? Is clearance going to become an issue? Looking for serious answers here, so Sl0wbaltSS GTFO.
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Measure the ptv clearance first, determine how much you can take off, then do it.
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Would you mill an ecotec head?
Pretty sure you can get away with some. The guy on the top of this whp list for NA 2.2 power shaved his head irrc, I just can't recall his user name
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Originally Posted by Slowbalt2000
(Post 7543402)
Measure the ptv clearance first, determine how much you can take off, then do it.
Originally Posted by ECaulk
(Post 7543409)
Pretty sure you can get away with some. The guy on the top of this whp list for NA 2.2 power shaved his head irrc, I just can't recall his user name
I'd reeeeeeeeally like to take that top spot on the dyno list. |
Originally Posted by supernovanator
(Post 7543486)
But... but... I'm lazy!:bye::lol: I really need to get a second car. This one can't be down more than a day.
I'm glad you said that. I looked at his old FCOTM and it was shaved .020" with the stage 2 comp cams(whatever those are) so I'd probably assume a stock set of cams would be fine. Shaving .020" would reduce combustion chamber size by a theoretical ~1.7cc. Good enough for me. I also have the liberty of owning HP Tuners and being able to make changes. Previous guy had an 06 with trifecta(barf). I'd reeeeeeeeally like to take that top spot on the dyno list. |
You will need to compensate with a thicker head gasket. The tolerences are very minimal
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Originally Posted by Omiotek
(Post 7543496)
You will need to compensate with a thicker head gasket. The tolerences are very minimal
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i got my complete block and head for 400 bucks :)
1800 miles on it haha |
Originally Posted by 07blackg5
(Post 7543511)
i got my complete block and head for 400 bucks :)
1800 miles on it haha |
Originally Posted by supernovanator
(Post 7543501)
That would kinda defeat the purpose of milling it. I wish I could just drop a few hundred bucks on a spare engine to build but 07-08 are just impossible to find, and when you do they are crazy overpriced
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Originally Posted by supernovanator
(Post 7543515)
There was one here with 236k miles for $850. I can't drop that much into a shit engine
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dude look on car-part.com
i got a 42k mile le5 from a junkyard for less than $500 picked up |
Originally Posted by supernovanator
(Post 7543486)
But... but... I'm lazy!:bye::lol: I really need to get a second car. This one can't be down more than a day.
I'm glad you said that. I looked at his old FCOTM and it was shaved .020" with the stage 2 comp cams(whatever those are) so I'd probably assume a stock set of cams would be fine. Shaving .020" would reduce combustion chamber size by a theoretical ~1.7cc. Good enough for me. I also have the liberty of owning HP Tuners and being able to make changes. Previous guy had an 06 with trifecta(barf). I'd reeeeeeeeally like to take that top spot on the dyno list. |
Transmission delete. Weight reduction AND less drivetrain loss
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right lol
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Originally Posted by Slowbalt2000
(Post 7543685)
swap to a manual that may give you a few hp hahaha
Originally Posted by 07blackg5
(Post 7543692)
Transmission delete. Weight reduction AND less drivetrain loss
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Will 14s clear our front brakes? The 14x7 Rpf1 are like 8.6lbs or something
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Originally Posted by 07blackg5
(Post 7543705)
Will 14s clear our front brakes? The 14x7 Rpf1 are like 8.6lbs or something
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Originally Posted by Havok_Cobalt
(Post 7543516)
that's what I was gonna say, why mill the head then compensate with a gasket?
so you wont be decking it enough to gain any compression. |
Like i said, measure it and do what you can. The tensioner should be able to compensate for .020 of difference...
I say at least measure it out and try it. I could maybe put a test motor together to see what stock ptv clearance is. |
Originally Posted by Slowbalt2000
(Post 7543757)
Like i said, measure it and do what you can. The tensioner should be able to compensate for .020 of difference...
I say at least measure it out and try it. I could maybe put a test motor together to see what stock ptv clearance is. Honestly though, I think I'm overthinking this. If you can buy cams that offer .05" more lift than stock then a stock cam should be just fine with a .02" shave. Plus it's been done before, with a larger than stock(comp stage 2 whatever the eff that is) cam. Sure, the 07+ cam is different but there's no way it's bigger than the 06-prior aftermarket cams. |
The 07 cams are actually the worst of all ecotec cams but thinking that just because aftermarket cams have higher lift doesnt mean they dont have a different ramp rate or duration. Still a good idea to measure it. But youll probably be fine.
My "test" motor is blown up in my garage so it wouldnt be super hard to do i just have to put it together. |
Originally Posted by Slowbalt2000
(Post 7543764)
The 07 cams are actually the worst of all ecotec cams but thinking that just because aftermarket cams have higher lift doesnt mean they dont have a different ramp rate or duration. Still a good idea to measure it. But youll probably be fine.
My "test" motor is blown up in my garage so it wouldnt be super hard to do i just have to put it together. |
I guess we'll see
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Well 07blackG5 just has to go and give me a great fucking offer on a set of stage 2 LSJ cams modded for the 07-08 L61... Maybe a spare bottom end is the way to go after all.
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