L35 or not????

[johnboy89]

How much of a performance gain do you get with L35's??????

I'm on the fence on whether to re-use the stock heads which were re-done not that long ago or use a set of L35's that will most likely need to be re-done???

I've seen posts they flow 10% more is that worth the price of a valve job or not?????

Thanx

 

[The Devils Own Chariot]

Re: L35 or not????

It depends on your goals. What are they?
The L35 head is just a better design. The stock heads cause detonation because of the flowing characteristics. I would think right away a stock L35 head would be 20whp gain over the stock ones. Just a guess, its not like I benched tested either cylinder heads.
Think about the money you will have in a tune if you change heads also. You cant put L35's on and expect to gain anything without a tune.

 

[dgoodhue]

Re: L35 or not????

What other mods do you have or planning to do? If your keeping it stock, use the stock heads.

 

[johnboy89]

Re: L35 or not????

What other mods do you have or planning to do? If your keeping it stock, use the stock heads.

I'm keeping it stock and using the stock chip......

I figured if it was enough of a gain and I could use the stock chip I would go with it.

Appears though to see the full benefit I would need a tune????

 

[the baPhoon]

Re: L35 or not????

A tune in itself is one of the absolute most beneficial things to make any power out of these turds.

If you want stock, stay stock.

If you mod, tune tune tune tune. It'll save you massive amounts of heartache and moola.

 

[It's just a six]

Re: L35 or not????

If your in need of a valve job or there is a reson you need to pull the heads off,,,then install some L-35's.
It's a bolt on affair.

I would think it would run just fine cruising around w/the L-35's,,, but,,,if you are wanting to turn up the boost & get more power out of it,then you would @ least need to turn up the fuel pressure.
The tune will most likely be off, but there are some ways to get around from a full blown tune.

I've been playin around on my Sy for years w/out any so-called tuning or hacking the factory ECU & have run a best of 12.0 w/a 100% stock longblock.

The thing about the LB4's being detonation prone heads I think all stated when Kenne Bell stated in his brochure & mag test that the stock heads are detonation prone.

IIRC, Tooky said himself the Vortecs heads will detonate as much as the stock heads & he is doing all the tuning you can do w/the stock ECU.

So w/the Vortecs heads being much better as far as chamber shape over the LB4's or the L-35's,,,Josh did not all of the sudden stop having detonation when he switched to the Vortecs.

 

[BigBadSmoosh]

Re: L35 or not????

where does one get the informaiton that l35s are that much better than stock heads?

also, since when do stock heads cause detonation?

why wouldn't a nice set of a ported and polished stock heads flow the same if not better than l35 heads?

vortecs i understand..

i'd love to see pics of all three side by side and the true differences pointed out.

 

[It's just a six]

Re: L35 or not????

The reason that the stock heads cannot possibly flow as much as the L-35's is because there is a major bottle neck in the intake port,there called a high swirl head because of this vane in the intake port.

Now,if you can take out this bottle neck,,then you can flow just as good as the L-35's ,,,but I have heard some of those intake port vanes are hollow & therefore cannot be removed,while if they are the solid type vane,you can remove it completely,,,but that is a lot of work to remove these vanes.

BTW,,,,if you have ever seen the stock cyl head intake ports,you will understand completely of what I am taking about.

I believe a set of nicely ported L-35 heads should be very close in flow numbers as compared to the newer 1996 & newer Vortecs.

 

[Syclone #1721]

Re: L35 or not????

the reason that the stock heads cannot possibly flow as much as the l-35's is because there is a major bottle neck in the intake port,there called a high swirl head because of this vane in the intake port.

Now,if you can take out this bottle neck,,then you can flow just as good as the l-35's ,,,but i have heard some of those intake port vanes are hollow & therefore cannot be removed,while if they are the solid type vane,you can remove it completely,,,but that is a lot of work to remove these vanes.

Btw,,,,if you have ever seen the stock cyl head intake ports,you will understand completely of what i am taking about.

I believe a set of nicely ported l-35 heads should be very close in flow numbers as compared to the newer 1996 & newer vortecs.

x2