alwayscode390
pppssssshhhhhtttttttttttt
Which are the best choice for a 412 or 415 cammed stock turbo'd engine? I am new to the 4.3's so I was curious of everyones opinions, thanks ---
Vortech, L-35 or stock ported heads?! ---
- Thread starter alwayscode390
- Start date
KIER24601
Darrick
Re: Vortech, L-35 or stock ported heads?! ---
Here is something I found on the boards a long time again, can't remeber who posted it or how true the figures.
Intake at .500 lift at 28" water
LB4 stock SY heads 165 cfm
1995down L35 heads stock 193cfm
1995down L35 heads minor porting 211cfm (at 24" water)
1996 up vortec head possibly 250cfm
1996 up ported vortec head 270cfm
brodix -8head stock 240cfm
brodix -8head ported 285cfm
brodix -10head stock 253cfm
brodix -10head ported 289cfm
hope this helps
Here is something I found on the boards a long time again, can't remeber who posted it or how true the figures.
Intake at .500 lift at 28" water
LB4 stock SY heads 165 cfm
1995down L35 heads stock 193cfm
1995down L35 heads minor porting 211cfm (at 24" water)
1996 up vortec head possibly 250cfm
1996 up ported vortec head 270cfm
brodix -8head stock 240cfm
brodix -8head ported 285cfm
brodix -10head stock 253cfm
brodix -10head ported 289cfm
hope this helps
Black Knight
I Glow Therefore I am
Re: Vortech, L-35 or stock ported heads?! ---
Can you flow too much? I mean assuming you change your cam.
Can you flow too much? I mean assuming you change your cam.
alwayscode390
pppssssshhhhhtttttttttttt
Re: Vortech, L-35 or stock ported heads?! ---
Hmmm I never knew you had to upgrade your turbo when you upped the cam, this is all new to me
. What turbo works good with the 412/415 comp cam then?! ---
kreepinty said:
Hmmm I never knew you had to upgrade your turbo when you upped the cam, this is all new to me
. What turbo works good with the 412/415 comp cam then?! ---
jwaller
Evil Genius/SyTy Guru
Re: Vortech, L-35 or stock ported heads?! ---
it seems you are asking whatever comes to mind without doing any reasearch on your own. all of these questions have been asked 100 times and the turbo question is like asking whats your favorite color. your going to get a lot of different answers. and with every question you are asking you must ask yourself and then tell others what you are planning on doing with the truck bc that will change the answer. if you want to race, drive or in between. I'm not trying to be nasty or mean, I've just been watching you ask the questions for some time and I've tried to answer some of them but most of them are easily found through some searching.
carry on---
alwayscode390 said:Hmmm I never knew you had to upgrade your turbo when you upped the cam, this is all new to me
it seems you are asking whatever comes to mind without doing any reasearch on your own. all of these questions have been asked 100 times and the turbo question is like asking whats your favorite color. your going to get a lot of different answers. and with every question you are asking you must ask yourself and then tell others what you are planning on doing with the truck bc that will change the answer. if you want to race, drive or in between. I'm not trying to be nasty or mean, I've just been watching you ask the questions for some time and I've tried to answer some of them but most of them are easily found through some searching.
carry on---
cloneman315
Active member
Re: Vortech, L-35 or stock ported heads?! ---
another thing u can do is like what i did go with a proven combo that works and has been proven and tested.
another thing u can do is like what i did go with a proven combo that works and has been proven and tested.
QUICK STORM
B.A.M.F. BMW Tech
Re: Vortech, L-35 or stock ported heads?! ---
i've gone with a proven combo as well, see my sig
i've gone with a proven combo as well, see my sig
alwayscode390
pppssssshhhhhtttttttttttt
Re: Vortech, L-35 or stock ported heads?! ---
I guess a proven combo it is then....I honestly did a search and didnt find ANYONE ask what was best between the three heads; the only way I knew there WAS a l-35 head was by searching .... same with the cam needing a turbo swap thing; there is no way I could have searched something I didnt even know was a possibility, but thanks anyway ... its not like that with a supercharged engine , or the n/a stuff I was working on before---
I guess a proven combo it is then....I honestly did a search and didnt find ANYONE ask what was best between the three heads; the only way I knew there WAS a l-35 head was by searching
.... same with the cam needing a turbo swap thing; there is no way I could have searched something I didnt even know was a possibility, but thanks anyway ... its not like that with a supercharged engine , or the n/a stuff I was working on before---
VermontTy
Support Our Troops
Re: Vortech, L-35 or stock ported heads?! ---
By the way John, I finally, FINALLY got everything dialed in (seems 32lb fuel pressure was pretty darn close; left DM at work and will confirm tonight) and took the bitch out for a dirt road run; she really cranks. I was only able to get maybe 2-3psi out of it before it went wildly out of control on the gravel, but it was a good feeling to be tossed back in the seat again. Thanks again for all of the support and stupid questions over the last year.
Realtree & Mossy Oakjwaller said:
.....where as I have ported Vortecs, a 412 and a stock-ish turbo....I'm definitely going to run out of turbo before I run outflow the heads, but I got to stick with a stock downpipe, air intake system, oil and turbo drain and feeds, etc. It was a financial issue that I can toss bigger crap at if I want to later on.93TyGuy said:
By the way John, I finally, FINALLY got everything dialed in (seems 32lb fuel pressure was pretty darn close; left DM at work and will confirm tonight) and took the bitch out for a dirt road run; she really cranks. I was only able to get maybe 2-3psi out of it before it went wildly out of control on the gravel, but it was a good feeling to be tossed back in the seat again. Thanks again for all of the support and stupid questions over the last year.
alwayscode390
pppssssshhhhhtttttttttttt
Re: Vortech, L-35 or stock ported heads?! ---
What kind of performance do you expect to get out of this combo? I am looking to see SOLID 12's when I am done ( 12.3-12.7 easily ) . Thanks ---
93TyGuy said:
What kind of performance do you expect to get out of this combo? I am looking to see SOLID 12's when I am done ( 12.3-12.7 easily ) . Thanks ---
Re: Vortech, L-35 or stock ported heads?! ---
Honestly I hope to go deep in the 11's up here with that setup. As for what it will do, only time and tuning will tell. If you want to go 12's I would go with a setup like Jer has. He goes 12.25 at bandimere with his setup. Ported L35s, port matched intake, T3/T4 turbo alky and custom turboback exhaust and an Ultimate v9 chip. ( correct me if I am wrong on this Jer)
Honestly I hope to go deep in the 11's up here with that setup. As for what it will do, only time and tuning will tell. If you want to go 12's I would go with a setup like Jer has. He goes 12.25 at bandimere with his setup. Ported L35s, port matched intake, T3/T4 turbo alky and custom turboback exhaust and an Ultimate v9 chip. ( correct me if I am wrong on this Jer)
alwayscode390
pppssssshhhhhtttttttttttt
Re: Vortech, L-35 or stock ported heads?! ---
I think I found a set of VORTEC heads for about $200 complete. The guy selling says they will fit on 96-99 4.3's. Will they just "bolt on" to our engines too?! I keep reading something about not being able to adjust the valves.... is that a problem I should consider? These are casting # #12556140, and he said would interchange with casting # #10235772. What are OUR stock castings? I also found some that are casting # 12561107 (not sure but if its close, lol )...are they the same? I plan on running some 1.6 roller rockers. Thanks ---
I think I found a set of VORTEC heads for about $200 complete. The guy selling says they will fit on 96-99 4.3's. Will they just "bolt on" to our engines too?! I keep reading something about not being able to adjust the valves.... is that a problem I should consider? These are casting # #12556140, and he said would interchange with casting # #10235772. What are OUR stock castings? I also found some that are casting # 12561107 (not sure but if its close, lol )...are they the same? I plan on running some 1.6 roller rockers. Thanks ---
Last edited:
dgoodhue
BuSTeD 4.3
Re: Vortech, L-35 or stock ported heads?! ---
You can do those numbers on a stock turbo and motor. Basically Ultimate chip and tuning. If on pump gas you will need Alky. If you want to be consistently on the low 12's all you need is a bigger turbo and tuning. You don't need heads cam to run that fast. The stock short block doesn't hold up to higher rev anyways so cams that need more RPM tend to short the life s of the stock internal drastically.
alwayscode390 said:
You can do those numbers on a stock turbo and motor. Basically Ultimate chip and tuning. If on pump gas you will need Alky. If you want to be consistently on the low 12's all you need is a bigger turbo and tuning. You don't need heads cam to run that fast. The stock short block doesn't hold up to higher rev anyways so cams that need more RPM tend to short the life s of the stock internal drastically.
alwayscode390
pppssssshhhhhtttttttttttt
Re: Vortech, L-35 or stock ported heads?! ---
Thank you , that taught me alot ---
Thank you , that taught me alot
---
alwayscode390
pppssssshhhhhtttttttttttt
Re: Vortech, L-35 or stock ported heads?! ---
????alwayscode390 said:
cloneman315
Active member
Re: Vortech, L-35 or stock ported heads?! ---
i wents 11.8 on 20 psi with just a 52 turbo and injectors, stock head intake mainifolds etc
i wents 11.8 on 20 psi with just a 52 turbo and injectors, stock head intake mainifolds etc
dgoodhue
BuSTeD 4.3
Re: Vortech, L-35 or stock ported heads?! ---
The most popular solution is the lower intake needs to be modified, (Renz, RPM, Turbotime, Waller, etc), they head also need to be drilled for the diffreent bolt pattern, plus you have to deal with the valve covers as well. The vortec also used metric studs for rockers.
alwayscode390 said:
The most popular solution is the lower intake needs to be modified, (Renz, RPM, Turbotime, Waller, etc), they head also need to be drilled for the diffreent bolt pattern, plus you have to deal with the valve covers as well. The vortec also used metric studs for rockers.