71 LS5 cam question

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Feb 24, 2016 | 03:29 PM

530planeman

Thread Starter

Drifting

Joined: Jan 2014

Posts: 1,866

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From: Sadieville Kentucky

71 LS5 cam question

does anyone know if a stock LS 5 can handle a cam with a 652/654 lift?
I have a new cam and lifters and want to see if I can use them ?
Thanks
Wes

Last edited by 530planeman; Feb 24, 2016 at 03:29 PM.

Feb 24, 2016 | 07:42 PM

mikem350

Melting Slicks

Joined: Feb 2006

Posts: 3,105

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From: Sunrise FL

Assume you are asking about piston to valve clearance with a hi lift cam? The usual way is to check with modeling clay on the piston dome, rotate engine couple times and measure the clearance. Lots of variables, including the rate of valve movement (lobe config). Contact the cam mfg, after getting your LS5 engine/cam specs.

At the least, use long slot or roller rockers.

Feb 24, 2016 | 08:06 PM

zwede

Race Director

Joined: Sep 1999

Posts: 11,360

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From: Plano TX

A cam with that kind of lift will be quite long duration. The engine will run awful as the cam won't match the intake & heads.

Feb 25, 2016 | 02:07 AM

Simmo

Pro

Joined: Jan 2004

Posts: 535

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From: Darwin, Australia NT

You will need new springs.

Also agree a cam that wont work well with factory compression of 9/1

Feb 25, 2016 | 02:25 AM

homestead

Racer

Joined: Jan 2015

Posts: 293

Likes: 43

From: Vernon B.C.

Also retainer to valve guide clearance along with coil bind will be issues with that much lift. There will be some machining involved to make it all work.

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