92-93 LT1 Rocker question
Thread Starter
Instructor
Joined: Mar 2016
Posts: 184
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From: Bowling Green Ohio
2021 C5 of the Year Finalist - Unmodified
2020 C5 of the Year Finalist - Unmodified
92-93 LT1 Rocker question
Has anyone put a 1.52 or 1.6 rocker on a 92-93 LT1 WITHOUT any edit to the tune? If so, did this work?
Can the ECM correct for the additional air flow?
The second part of the question would be, and please forgive my ignorance on the matter, would a larger fuel injector with the rockers help? This is a just a hypothetical question based on the idea that the stock tune remained and was not altered. Most threads on the matter come down to tuning which would be ideal.
Can the ECM correct for the additional air flow?
The second part of the question would be, and please forgive my ignorance on the matter, would a larger fuel injector with the rockers help? This is a just a hypothetical question based on the idea that the stock tune remained and was not altered. Most threads on the matter come down to tuning which would be ideal.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
A 1.52 rocker is IMO close enough to stock that it wouldn't make a difference.
A 1.6 IMO would work "fine" from an ECM/tune perspective, but I doubt the stock valve springs would like the added lift.
A 1.6 IMO would work "fine" from an ECM/tune perspective, but I doubt the stock valve springs would like the added lift.
Le Mans Master
Joined: Feb 2005
Posts: 6,479
Likes: 565
From: Clearwater Florida
..... With the stock camshaft , the added lift from installing a 1.6 rocker ratio vs 1.5 amounts to right around .030" ... not enough to upset the factory ECM ... but , anytime changes are made to the valvetrain , they need to be verified before you start the engine ... the OEM springs are lightweights in terms of spring pressure but will handle the extra lift ... where things get dicey is the clearance between the very bottom of the Valve spring retainer and the top of the valve guide/valve seal ... If your cam has anywhere near .500" valve lift , you will likely need to have the guides machined for clearance and some better than stock springs .....
