.600 Max lift
Thread Starter
Teching In
Joined: Aug 2018
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.600 Max lift Hey guys, I"m just really starting to get my feet wet in the LS world and engine building in general and some things are a little fuzzy, even the answers are sometimes a little to vague for me. I have a couple simple questions to most of you but a little confusing to me and I apologize if it's explained somewhere and I've missed it. 1st questions, I was looking at a set of Trick Flow heads for my 99 Z28 that has the 241 heads currently. The heads I was looking at says it has max valve lift of .600", they are fully assembled. Does that mean that the valves in the heads max out at .600" lift, or does it mean that I cannot run a cam with more lift than .600"? The reason I'm asking is - I previously bought a BTR stage 2 cam kit that is .227 int .234" ext. and .613" lift and 113 LSA i believe and the springs have a max of .660". I was hoping to buy the trick Flow bare casting heads and put my .660 springs in and use my .613" lift cam but I'm worried about the max .600" per Trick Flow specs. The cam kit I have is brand new and only had a couple of start ups on it and honestly it just made me want more lol. 2nd questions is- what exactly is "as cast heads" does it mean they are made from a mold with no work done to them as far as cleaning them up inside like deburring and porting, can they be ported later on, or how you buy them is how they have to be ran? And finally, are the "as cast" heads worth it? thank you for you time and thanks to all that contribute info to this site, I've learned a lot.
Valve lift is limited by distance between the underside of the retainer and the spring pocket. Just adding a different spring isn't going to change that. You'll need a longer valve, or you'll need to cut the spring pocket.
Look at this chart here: https://www.racingsprings.com/index....s-springs.html
a .600 spring has an installed height of 1.800". A .650 spring has an installed height of 1.900".
All commonly used cylinder heads are sand cast. You can get billet, but they're pretty expensive. "As Cast" means the ports and chambers are exactly how they came out of the sand cast. No porting, polishing, or smoothing. As you would expect, there are some very small variances in the surfaces that have not been machined. You can hand port and polish them, if you know what you're doing. Or you can have them CNC machined. It's a significant price increase, but not a significant power increase. If you're racing and need every last hp, then it's worth it. If you're building a fun street car, probably not.
Look at this chart here: https://www.racingsprings.com/index....s-springs.html
a .600 spring has an installed height of 1.800". A .650 spring has an installed height of 1.900".
All commonly used cylinder heads are sand cast. You can get billet, but they're pretty expensive. "As Cast" means the ports and chambers are exactly how they came out of the sand cast. No porting, polishing, or smoothing. As you would expect, there are some very small variances in the surfaces that have not been machined. You can hand port and polish them, if you know what you're doing. Or you can have them CNC machined. It's a significant price increase, but not a significant power increase. If you're racing and need every last hp, then it's worth it. If you're building a fun street car, probably not.
Hey guys, I"m just really starting to get my feet wet in the LS world and engine building in general and some things are a little fuzzy, even the answers are sometimes a little to vague for me. I have a couple simple questions to most of you but a little confusing to me and I apologize if it's explained somewhere and I've missed it. 1st questions, I was looking at a set of Trick Flow heads for my 99 Z28 that has the 241 heads currently. The heads I was looking at says it has max valve lift of .600", they are fully assembled. Does that mean that the valves in the heads max out at .600" lift, or does it mean that I cannot run a cam with more lift than .600"? The reason I'm asking is - I previously bought a BTR stage 2 cam kit that is .227 int .234" ext. and .613" lift and 113 LSA i believe and the springs have a max of .660". I was hoping to buy the trick Flow bare casting heads and put my .660 springs in and use my .613" lift cam but I'm worried about the max .600" per Trick Flow specs. The cam kit I have is brand new and only had a couple of start ups on it and honestly it just made me want more lol. 2nd questions is- what exactly is "as cast heads" does it mean they are made from a mold with no work done to them as far as cleaning them up inside like deburring and porting, can they be ported later on, or how you buy them is how they have to be ran? And finally, are the "as cast" heads worth it? thank you for you time and thanks to all that contribute info to this site, I've learned a lot.
The as cast heads are pretty much self explanatory, the ports and chambers are as cast with little to no porting done, however, they are based on a ported head so the ports are a lot better than a stock head. You can port them further as there is still plenty of meat left in them to go bigger.
Thread Starter
Teching In
Joined: Aug 2018
Posts: 2
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More often than not, the max lift is determined by the installed height and coilbind clearance of the springs. The TFS heads usually have a 1.8xx" installed height, so there are plenty of springs out there that support over .600" lift. The PAC link that was posted even shows several options for .750" lift with a 1.800" installed height. You can use your BTR springs on the TFS heads without issues.
The as cast heads are pretty much self explanatory, the ports and chambers are as cast with little to no porting done, however, they are based on a ported head so the ports are a lot better than a stock head. You can port them further as there is still plenty of meat left in them to go bigger.
The as cast heads are pretty much self explanatory, the ports and chambers are as cast with little to no porting done, however, they are based on a ported head so the ports are a lot better than a stock head. You can port them further as there is still plenty of meat left in them to go bigger.
12 Second Club
Joined: Oct 2003
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From: Mpls. Mn.
Hey guys, I"m just really starting to get my feet wet in the LS world and engine building in general and some things are a little fuzzy, even the answers are sometimes a little to vague for me. I have a couple simple questions to most of you but a little confusing to me and I apologize if it's explained somewhere and I've missed it. 1st questions, I was looking at a set of Trick Flow heads for my 99 Z28 that has the 241 heads currently. The heads I was looking at says it has max valve lift of .600", they are fully assembled. Does that mean that the valves in the heads max out at .600" lift, or does it mean that I cannot run a cam with more lift than .600"? The reason I'm asking is - I previously bought a BTR stage 2 cam kit that is .227 int .234" ext. and .613" lift and 113 LSA i believe and the springs have a max of .660". I was hoping to buy the trick Flow bare casting heads and put my .660 springs in and use my .613" lift cam but I'm worried about the max .600" per Trick Flow specs. The cam kit I have is brand new and only had a couple of start ups on it and honestly it just made me want more lol. 2nd questions is- what exactly is "as cast heads" does it mean they are made from a mold with no work done to them as far as cleaning them up inside like deburring and porting, can they be ported later on, or how you buy them is how they have to be ran? And finally, are the "as cast" heads worth it? thank you for you time and thanks to all that contribute info to this site, I've learned a lot.
