Cheap Vortec 350 Longblock Build

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May 29, 2008 | 07:49 PM

#51

DM91RS

Supreme Member

Joined: Jul 2000

Posts: 1,854

Likes: 0

From: Ga

Car: 91 RS

Engine: 305

Transmission: T5

Axle/Gears: 3.73

Re: Cheap Vortec 350 Longblock Build

Quote:

Originally Posted by graebz28

Sorry, I am getting my terminology mixed up. The tool in mention is what you would used to cut the spring seat to the correct diameter for LT-4 springs as opposed to buying the beehives.

That's what I figured but was not sure. I do know the cutter that I have is for 1.4 double springs........

You gotta watch all the little things and how they can add up compared with buying complete heads.

May 29, 2008 | 11:43 PM

#52

slow_90firebird

Senior Member

Joined: Jul 2007

Posts: 1,461

Likes: 1

From: Manchester, CT + Nashua, NH

Car: 90 Firebird Formula

Engine: LO3

Transmission: T5

Axle/Gears: 3.08 one wheel peel

Re: Cheap Vortec 350 Longblock Build

Quote:

Originally Posted by TonyC

"Absolute Pain" is a fairly aggressive statement to make, what is your basis for claiming this? Have you tuned an engine with an LT4 cam before? Have you tuned your engine? What are the specs of it? My point being that this is a mild combo and "pain" is of course relative. Fast355 lays out how to tune nearly this exact combo in the sticky to this forum! Don't rush it Mike, it sounds like you're getting all of your bases covered, it will be a fun car when you're done with this!

Well I am looking at getting the EBL, and eventually the LT1 cam or similar. I posted up on here a while ago, and asked how hard it would be for a beginner to tune for a hotcam. And the experienced members said that with the TBI + the hotcam, it will be a "nightmare" or some other word to that degree. They said the LT1 cam is enough of a project in itself to tune for in some LO3's.

May 30, 2008 | 12:16 AM

#53

Fast355

Supreme Member

iTrader: (2)

Joined: Jan 2005

Posts: 10,419

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From: Hurst, Texas

Car: 1983 G20 Chevy

Engine: 305 TPI

Transmission: 4L60

Axle/Gears: 14 bolt with 3.07 gears

Re: Cheap Vortec 350 Longblock Build

Quote:

Originally Posted by slow_90firebird

Stock ECM the LT4 hotcam is pretty difficult to tune for. With the EBL and a wideband its ALOT easier. I ran a cam that spec'd 224/224 @ .050" lift in my 305 on the stock truck ECM. It wasn't all that hard to tune. The biggest issue that I had to fight out was a high map code. I eventually found the address in the ecm code where the limit was and upped it to a more reasonable (for the cam) figure.