anyone running l31 heads on 350 tbi

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Oct 4, 2011 | 11:01 AM

#51

$Zach/90\irocZ's Avatar$

Zach/90\irocZ

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Joined: Aug 2011

Posts: 2,381

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From: San Diego, California For Now

Car: 88 Formula, 90 Iroc RIP, 92 RS Sold

Engine: 305 to 350

Transmission: 700r4

Axle/Gears: 10 Bolt

Re: anyone running l31 heads on 350 tbi

i was going to change and make l05 into a roller due to flat tap is not that good in the long run if you drive often it wears out quicker due to more friction

Quote:

Originally Posted by bluers91

I agree alvan. I have noticed big differences while creating cam files measured @.050 vs Advertised duration. DD2000 also favors some Roller cams from what I have seen.

To make the intended power range it will require better valve springs and some work to the heads for a little increased lift. You may consider some flat tappet cams since you have the L05.

Oct 4, 2011 | 11:03 AM

#52

bluers91

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Joined: Dec 2005

Posts: 443

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From: Wild Blue Yonder

Car: 1991 RS Camaro

Engine: 350 TBI

Transmission: 700R4

Axle/Gears: 3.42 Posi

Re: anyone running l31 heads on 350 tbi

Quote:

Originally Posted by alvanwie

bluers91,

What did you use for the intake centerline for the LT4 cam?

I just used a cam file I had already sitting around. It appears to be 110. Not sure if that is correct or not.

Oct 5, 2011 | 05:57 PM

#53

thomas1976

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Joined: Jun 2006

Posts: 2,199

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From: West-Central

Car: 91 Trans am

Engine: built 360 TBI

Transmission: built 700r4

Axle/Gears: 10bolt/3.23

Re: anyone running l31 heads on 350 tbi

In case you have not came across this tread https://www.thirdgen.org/forums/tbi/...i-buildup.html it has good information, including max lift with the vortec heads.

I would also suggest to play with camquest6 http://www.camquest.com/, skip the flat tapped cams.

This is the first to do list before buying anything