cam and heads

[drd21968]

hello i have a current motor build and could use some advice.i purchased a block,machined 40 over,forged pistons,had rotating assembly balanced,scat crank.should i use my stock heads and cam,or would there be a better choice.

 

[It's just a six]

Re: cam and heads

Get some L35 heads, they bolt right on & flow much better than the stock heads.

Go w/a bigger cam w/approx 204 duration @ .050 .450 -.480 lift on a 114 lobe center .

 

[neildemo]

Re: cam and heads

What cam would be ideal 412 415 422? I am a cam idiot Thanks.

 

[drd21968]

Re: cam and heads

are the heads hard to find.who sells them ?i spent alot extra making it strong i would want to get the most out of the build.my crank broke in my original motor so its pretty much all new anyway.the heads were all i was thinking about re using

 

[NecroWolf]

Re: cam and heads

L35 heads are pretty common

 

[undrcvr_ty]

Re: cam and heads

You should be able to find the heads in a junkyard. I found mine in a 93 Blazer with CPI. I think the casting number ends with 181. You can do a search for L35 casting numbers to get the exact numbers.

 

[qbnkiller]

Re: cam and heads

The L35's are nice heads to drop right in. If the combo is right, it can make some nice power. If you can afford to convert to VORTECs, make the switch - definitely worth the performance gains! That, and I happen to have a fully built set for sale

 

[It's just a six]

Re: cam and heads

Yes w/a mild build & L35's you could make this power.
http://www.youtube.com/watch?v=sZ4zWQR8qwE

 

[qbnkiller]

Re: cam and heads

I took my L35's to 670hp, and some untouched VORTECS with 2.02/1.60 valves to 780+hp. Cam and heads are a part of the puzzle, but not the only part!

 

[It's just a six]

Re: cam and heads

If your heads do not flow, they will not make the power, it's a big,big part of the build.

What was done to your L-35's & what did they flow?

 

[qbnkiller]

Re: cam and heads

bowl and blending...some runner work but not much. I will have to see if I can find the paperwork, but I think intake side flowed just under 200 and the exhaust was in the 140's. Not terribly impressive numbers, but the proof was in the times I ran last year and power it made before they let go.

To answer the OP's question, the L35's are a decent drop-in replacement that can net some gains. The VORTECs will, however, flow more with additional work to your intake manifold. All things being equal, I saw a 70HP jump with the exact same tune (fuel, boost, timing).

 

[dgoodhue]

Re: cam and heads

If your heads do not flow, they will not make the power, it's a big,big part of the build.

Agreed. Stock unported L35 flow about 10% more than stock. Stock Vortec flow about 40% more than stock.

 

[drd21968]

Re: cam and heads

The L35's are nice heads to drop right in. If the combo is right, it can make some nice power. If you can afford to convert to VORTECs, make the switch - definitely worth the performance gains! That, and I happen to have a fully built set for sale

ok im sure it has been covered before.you have alredy had trial and error with making power.what is involved with converting to vortec heads.i really went with some good parts on this build i want to finish it right.vortec heads,what cam?

 

[drd21968]

Re: cam and heads

Yes w/a mild build & L35's you could make this power.
http://www.youtube.com/watch?v=sZ4zWQR8qwE

damn,that is impressive.if i could see 400hp i would be happy

 

[DubJG]

Re: cam and heads

ok im sure it has been covered before.you have alredy had trial and error with making power.what is involved with converting to vortec heads.i really went with some good parts on this build i want to finish it right.vortec heads,what cam?

http://www.syty.net/forums/showthread.php?t=50970