Need opinions for LT1 Boosted Heads/Cam combo
Need opinions for LT1 Boosted Heads/Cam combo Long story short I took my car to get dynoed. Car fell on its face around 4500rpm from what I believe to be valve spring seat pressure is to low. The car also has a severe oil leak that I have been chasing for two years now.
The cars current set up is as follows:
355 Lt1 block
mahle dished 5cc pistons
eaglr H beam rods
stock crank
heads are AFR190 port flowed 294/208 CFM
60cc 2.05/1.60 @.600
cam custom grind LE 223/230 .565 112 LSA
Crane 99893 double valve springs
ls7 lifters
Comp 1.6 rockers NSA 7/16
7/16 rocker studs
intake is LE ported
current compression ratio is 10.3:1
I believe when the engine builder milled the heads from 65cc down to 60cc and they did not mill the intake as well because the bolt holes did not line up when I had a friend remove the intake for the oil
leak. He basically oblonged the intake holes and made it fit. Which makes be believe it’s not sealing properly.
Here are my options:
1. Keep AFR190 heads/LE cam and have Lloyd Elliot make up another intake to mate up with heads and put new Lunati springs in heads. (cheapest) compression ratio would stay around 10.3:1
2. Purchase new Trickflow heads, intake and LE boosted cam from Lloyd Elliot. (Expensive). Can make Compression ratio whatever I want.
3. Purchase a used set of AFR 210 heads with 75cc chambers and new ported intake. (Mid range on expense) compression ratio would drop to 8.8:1
i am running 10lbs of boost so I am not sure how much power the car would make with 8.8:1 CR.
I am also running meth.
I know people will say it depends on my budget but I am wanting the most “reasonable” without the thoughts of failure.
Opinions are greatly appreciated!
The cars current set up is as follows:
355 Lt1 block
mahle dished 5cc pistons
eaglr H beam rods
stock crank
heads are AFR190 port flowed 294/208 CFM
60cc 2.05/1.60 @.600
cam custom grind LE 223/230 .565 112 LSA
Crane 99893 double valve springs
ls7 lifters
Comp 1.6 rockers NSA 7/16
7/16 rocker studs
intake is LE ported
current compression ratio is 10.3:1
I believe when the engine builder milled the heads from 65cc down to 60cc and they did not mill the intake as well because the bolt holes did not line up when I had a friend remove the intake for the oil
leak. He basically oblonged the intake holes and made it fit. Which makes be believe it’s not sealing properly.
Here are my options:
1. Keep AFR190 heads/LE cam and have Lloyd Elliot make up another intake to mate up with heads and put new Lunati springs in heads. (cheapest) compression ratio would stay around 10.3:1
2. Purchase new Trickflow heads, intake and LE boosted cam from Lloyd Elliot. (Expensive). Can make Compression ratio whatever I want.
3. Purchase a used set of AFR 210 heads with 75cc chambers and new ported intake. (Mid range on expense) compression ratio would drop to 8.8:1
i am running 10lbs of boost so I am not sure how much power the car would make with 8.8:1 CR.
I am also running meth.
I know people will say it depends on my budget but I am wanting the most “reasonable” without the thoughts of failure.
Opinions are greatly appreciated!
Fix your leaks and valve springs. Then let it eat.
I have stock heads with a decent port job on them and they perform fine. You have boost, use that while you can to get power, Cheaper to pulley down or add more wastegate spring than new heads etc.
I have stock heads with a decent port job on them and they perform fine. You have boost, use that while you can to get power, Cheaper to pulley down or add more wastegate spring than new heads etc.
Yes, seems like the most economical way of making this work aswell. Just not sure if Lloyd Elliot will need my heads shipped to him to determine the angle required for the intake to be milled or not! I will def be following up with him about this! On a side note it may be good for him to have the heads to put the new springs on it!
Are you 100% that its leaking air charge or is it just a correlation from the oil leak?
I would suggest running a smoke test to see if intake is sealed up to heads and then if that passes just redo the china walls to fix the oil leak.
I would suggest running a smoke test to see if intake is sealed up to heads and then if that passes just redo the china walls to fix the oil leak.
I did also search as I have MLS cometic .030" head gaskets that they possibly leak as well as the surface on the heads were not ideal from dexcool coolant. So maybe pulling the heads and using copper gasket spray or new gaskets would benefit me as well.
Ive tried the oil dye three times with no luck now. so pulling the heads might be my only option and redo.