Thread: L67 build questions

Hello, I have a completely stock L67. In my Fiero with a 5 speed, and I was walking the junk yard, the other day. When I found a gold mine. It look like some one was building a l67 and never got finished because It was not all together, but it did have brand new CNC zzp cylinder heads, xp cam, push rods, double roller timing chain and Billet fuel rail. So I grabbed it all. But now I'm wondering, If I should go with a bigger cam or modified rockers. Before I put it in.
Ok my questions Are,

• would it be worth it to get a bigger cam?
• would it be better to buy 1.9 rockers

I know that 1.9 would be a lot of lift like .617/.636 but the the cylinder heads are milled for .600 and modified retainers with valve seals that give, An extra .05. That gives a total of .650. which give a .0135 of Clarence. Is that enough Clarence? The heads have #136 valve springs.

And where is this junk yard?

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you could add rockers to the XP cam, just need to take measurements and not exceed the limits. you don't have to add 1.9 rockers, you could do 1.7 or 1.8 and maybe not be over the limit.

Originally Posted by jesseC651

And where is this junk yard?

LKQ Pick Your Part Savannah. But I got all the parts sorry

Originally Posted by Scottydoggs

cam is best, xp is as big as your going with out head work really.

rockers help, but they just mimic the stock cams profile.

and you run stock rockers on a aftermarket cam, or 1.6 roller rockers if you like rollers. not needed tho.

The heads I got are ZZP CNC and a xp. I was just thinking with these heads, maybe go with a bigger cam

Originally Posted by SgtMarshal

you could add rockers to the XP cam, just need to take measurements and not exceed the limits. you don't have to add 1.9 rockers, you could do 1.7 or 1.8 and maybe not be over the limit.

Intense only sells roller rockers now and ZZP only have 1.65 and 1.9 now

so get the yella terra roller rockers...

I think you are referring to the study zzp did to show the effectiveness of their "ER Rockers" for NA 3800's, which as it turns out is not applicable in supercharged applications. Plenty of people have made good power with roller rockers. you could just keep it simple and use what you have, but add an intercooler instead of a bigger cam and/or rockers.

My plans for the build are.

• Gen v supercharger
• 2.x-3.2 pulley
• phenolic intercooler
• CNC heads with 136# that is what's in them
• 60 #injector
• Double roller timing chain
• stock l62 lower end
• xp or bigger cam ?

hoping 350whp through the manual