SBC 18 or 15 degree heads...
01-19-2007 | 02:55 PM
#21
Originally Posted by Fire67
First if your not going to go over 7200, forget the different valve angle and forget a solid roller... You'd be wasting your time IMHO as both were designed by the aftermarket with racing in mind, and that means 7200+ revs.
There are lots of carb style intakes available for the 18* and 15* heads, you'd just have to convert one to EFI or run a carb. No big deal unless your gonna go sheetmetal which would be $$$$.
There are lots of carb style intakes available for the 18* and 15* heads, you'd just have to convert one to EFI or run a carb. No big deal unless your gonna go sheetmetal which would be $$$$.
But the different valve angle isn't going to help me in the low to mid range? I'm looking to build a well thought out daily driver with some serious ***** while keeping my costs reasonable, hence beefing up the stock crank. But I'm willing to spend some extra to stand out from the crowd and to get those couple extra hp. Thanks for the help!
01-19-2007 | 03:03 PM
#22
Originally Posted by v7guy
I don't think you really comprehend what you're getting into here (I could be wrong). There have been a few guys that have tried, and less that have completed the project. Typically several thousand in parts and labor and they throw in the towel and sell everything.
You can make an off the shelf intake work with some grinding if I remember right. Afterwards you need custom headers, a way to route the steering linkage, valvetrain specific to your project etc. It turns into big money quick.
If your just doing it to do it and have money by all means please do and show us lots of pics. Other than that, there are alot better (cheaper) ways to make the power
You can make an off the shelf intake work with some grinding if I remember right. Afterwards you need custom headers, a way to route the steering linkage, valvetrain specific to your project etc. It turns into big money quick.
If your just doing it to do it and have money by all means please do and show us lots of pics. Other than that, there are alot better (cheaper) ways to make the power
01-19-2007 | 09:43 PM
#25
if your gonna anny up for a sb2.2 setup, might as well ditch the factory LT1 block and go aftermarket.
having said this, you gotta take a look at the new LSx block. good for 2500hp?!?!
might as well convert over to that since im sure there is going to be some amazing heads available for that in the future.
having said this, you gotta take a look at the new LSx block. good for 2500hp?!?!
might as well convert over to that since im sure there is going to be some amazing heads available for that in the future.
01-20-2007 | 03:02 AM
#26
Uhh, I'm not building a race car here... I'm not gonna put friggin' NASCAR heads on my motor, not in this lifetime anyways, lol. But I still haven't had my question answered. Are there any advantages to reduced valve angle heads at reasonable RPMs? I could get a set of bare 18* TFS heads and have someone port them for my small displacement. Again, correct me if I'm completely off base.
01-20-2007 | 03:28 AM
#27
YES there are, put the port height has to be increased when the angle of the heads is decreased. Shallower valve angles give the port a better shot down the cylinder, and a smaller chamber which can lead to higher compression or better burn.
Bret
Bret
01-22-2007 | 03:58 PM
#28
Someone explain the whole "offset rocker arms/offset lifters." thing to me. And after reading on TFS's page, they made it sound like they were really only for high-rpm applications...
01-22-2007 | 05:55 PM
#29
Offset rockers (shaft mounts) are part of what you need when you widen the pushrod restriction in the intake ports to gain cross sectional area. You couple them with offset lifters so the whole pushrod is moved over.
This is a good picture of what happens (even though it's a MOPAR)
Notice how the intake pushrods and rocker arms are moved away from the intake port?
That is the difference in the lifters.... the one on the left has a centered pushrod cup and the one on the right is a offset pushrod cup.
Bret
This is a good picture of what happens (even though it's a MOPAR)
Notice how the intake pushrods and rocker arms are moved away from the intake port?
That is the difference in the lifters.... the one on the left has a centered pushrod cup and the one on the right is a offset pushrod cup.
Bret
01-23-2007 | 07:58 PM
#32
Thanks for the info man 
But I'm still uninformed as to wether it would be worth the effort on a street-driven 355? So I could have higher compression and a more efficient burn... like how much of a difference are we talking here? Obviously I'll discuss all this with whoever's building my motor when it comes time, I just like brainstorming in the meantime 
But I'm still uninformed as to wether it would be worth the effort on a street-driven 355? So I could have higher compression and a more efficient burn... like how much of a difference are we talking here? Obviously I'll discuss all this with whoever's building my motor when it comes time, I just like brainstorming in the meantime
01-23-2007 | 08:54 PM
#33
TECH Regular
Joined: Aug 2003
Posts: 483
Likes: 0
From: Texas
you'll definately benefit from an 18 degree head if done right. Stay away from the brodix 18x heads..there ok if your on a budget but not worth it, wont make much more power over a good 23 degree head, they use 23 degree valvetrain and you have to use there shitty manifold, but there **** compared to a true 18 degree head like a GM or i guess a TFS are decent to.
01-24-2007 | 03:45 PM
#37
Originally Posted by vtec
Having said this, you gotta take a look at the new LSx block. good for 2500hp?!?!
might as well convert over to that since im sure there is going to be some amazing heads available for that in the future.
might as well convert over to that since im sure there is going to be some amazing heads available for that in the future.
01-25-2007 | 05:09 PM
#38
Originally Posted by SStrokerAce
If your asking about 15-18° heads you ain't real worried about price.
Bret
Bret
01-25-2007 | 11:40 PM
#40
Originally Posted by SStrokerAce
Offset rockers (shaft mounts) are part of what you need when you widen the pushrod restriction in the intake ports to gain cross sectional area. You couple them with offset lifters so the whole pushrod is moved over.
This is a good picture of what happens (even though it's a MOPAR)
Notice how the intake pushrods and rocker arms are moved away from the intake port?
That is the difference in the lifters.... the one on the left has a centered pushrod cup and the one on the right is a offset pushrod cup.
Bret
This is a good picture of what happens (even though it's a MOPAR)
Notice how the intake pushrods and rocker arms are moved away from the intake port?
That is the difference in the lifters.... the one on the left has a centered pushrod cup and the one on the right is a offset pushrod cup.
Bret
I've never seen a setup like that, but what are those extra fittings for? I take it for coolant routing??? Forgive the stupidity