RPM 408 Results
12-10-2011, 12:51 PM
#21
I don't recommend modifying those 215 heads, simply sell them for good money and buy the heads you need. If you could sell those for $1600-$1700 and pick up some used 235's for slightly more, that would be your best bet.
A quick search I found some TFS 235's posted for $1750
https://ls1tech.com/forums/parts-cla...d-checked.html
A quick search I found some TFS 235's posted for $1750
https://ls1tech.com/forums/parts-cla...d-checked.html
Too much money to rework the 215's.
12-10-2011, 03:36 PM
#22
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I don't recommend modifying those 215 heads, simply sell them for good money and buy the heads you need. If you could sell those for $1600-$1700 and pick up some used 235's for slightly more, that would be your best bet.
A quick search I found some TFS 235's posted for $1750
https://ls1tech.com/forums/parts-cla...d-checked.html
A quick search I found some TFS 235's posted for $1750
https://ls1tech.com/forums/parts-cla...d-checked.html
12-10-2011, 03:38 PM
#23
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What did your car run? I'm not saying this shouldn't happen or the bigger heads wouldn't make more power but it's making it seem like you can't lean on the cam to make power with the 215cnc heads..
12-10-2011, 04:13 PM
#24
I think that the TFS 215's are the best heads for a 346-383.
But once you get into your 402,408,416 the TFS 235's are the way to go.
You will spend more money by opening up the 215 to 235, than selling the 215and putting alittle more money in and getting the 235.
Instead of the TFS 235's, which are great heads, I went with Mast 245
Cathedral Port. Just to try a different product.
Old 382 went 10.90's @121
12-10-2011, 05:21 PM
#25
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Guys I appreciate the thought process behind switching to a 235, however I am not pulling the heads off anytime soon.
I'm looking to compare and contrast the benefits of the following-
2 inch vs 1 7/8 headers
FAST 102 setup vs single plane Vic Jr style setup.
Cam is a 247/251 .623/.623 111 lsa
Again, I know there would be a nice improvement with the 235 on the top end, but let's pretend that isn't an option right now.
Thanks!
I'm looking to compare and contrast the benefits of the following-
2 inch vs 1 7/8 headers
FAST 102 setup vs single plane Vic Jr style setup.
Cam is a 247/251 .623/.623 111 lsa
Again, I know there would be a nice improvement with the 235 on the top end, but let's pretend that isn't an option right now.
Thanks!
12-10-2011, 05:57 PM
#26
All I was saying is, when the OP decides to upgrades to bigger heads, it would cost less to sell his 215's and then buy some 235's. Than spending the money on opening the 215's up. Hell, he could probably sell his 215's and put acouple hundred dollars with that and get some 235's.
12-10-2011, 09:48 PM
#27
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IMO, the 2" headers MIGHT gain you a couple hp at the very top of the powerband and would be good with a healthy shot of spray, but you might lose some low end in the process. With 1 7/8 I would bet you'd gain everywhere. The 1 7/8 are also going to be easier to install. I'm not sure what your k-member setup is, but the 2" would require a little more clearancing if you have a stock K.
12-11-2011, 08:08 AM
#28
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IMO, the 2" headers MIGHT gain you a couple hp at the very top of the powerband and would be good with a healthy shot of spray, but you might lose some low end in the process. With 1 7/8 I would bet you'd gain everywhere. The 1 7/8 are also going to be easier to install. I'm not sure what your k-member setup is, but the 2" would require a little more clearancing if you have a stock K.
Any thoughts on the intake setup?
12-11-2011, 12:14 PM
#29
99zMD,
I have a 11.14cr 418" motor with AFR 225's running a 245/260 hyd roller cam with a Super Vic/dominator TB and 1 3/4" stepped to 1 7/8" headers. Here is a link to the full set up and dyno sheet. Keep in mind, this is through a 4L80E / 12 bolt / 4.56's and a heavy 315/60/15 drag radial
https://ls1tech.com/forums/dynamomet...na-no-n20.html
That should give you an idea of the power curve.
Why did I go with a Super Vic over a vic JR? I have both intakes. Here are some pics to look at: https://ls1tech.com/forums/10427455-post13.html
The Super vic seems to have better entry, bigger plenem, and the runners are a bit bigger.
I am confident that moving to a 2" stepped to 2 1/8" header with a 4" collector would gain power on my combo.
I have a 11.14cr 418" motor with AFR 225's running a 245/260 hyd roller cam with a Super Vic/dominator TB and 1 3/4" stepped to 1 7/8" headers. Here is a link to the full set up and dyno sheet. Keep in mind, this is through a 4L80E / 12 bolt / 4.56's and a heavy 315/60/15 drag radial
https://ls1tech.com/forums/dynamomet...na-no-n20.html
That should give you an idea of the power curve.
Why did I go with a Super Vic over a vic JR? I have both intakes. Here are some pics to look at: https://ls1tech.com/forums/10427455-post13.html
The Super vic seems to have better entry, bigger plenem, and the runners are a bit bigger.
I am confident that moving to a 2" stepped to 2 1/8" header with a 4" collector would gain power on my combo.
12-11-2011, 07:48 PM
#31
12-12-2011, 08:44 AM
#33
Buy you a set of kooks headers with 3.5" collectors and I have a brand new stainless off road y pipe 3.5" x 3.5" x 3.5" I will make you a hell of a deal on . Just had a baby and I gotta sell it.
