L48 Heads
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L48 Heads
[[FONT="C
entury Gothic"][/FONT]ONT="Arial Black"][/FONT]Hi, I have a 75 L48 that needs heads I was told that the heads off a 305 would work fine and produce more power or should I look for something else?
entury Gothic"][/FONT]ONT="Arial Black"][/FONT]Hi, I have a 75 L48 that needs heads I was told that the heads off a 305 would work fine and produce more power or should I look for something else?
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
IMHO, best heads for this combo if you don't mind changing the intake are the stock GMPP Vortec heads. 64cc chamber that will bring you to 9.5 CR and outstanding flow through about .450 lift. Match these heads with a good cam and headers and that L-48 will make about 320 HP at the flywheel. They're about $600 for a set, assembled. You'll need to add a set of self-aligning rockers and you're ready to go.
If you don't want to change the intake, then there are more choices, but all more expensive. Budget then becomes the question, along with what you want from the engine (power, driveability, etc.)
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
The 305 heads are garbage. They have small ports and tiny valves. Don't waste your time. Yes they have 58cc chambers for an increase in comp. ratio but everything else about them is not good for HP. Use them for a door stop or anchor.
Former Vendor
Joined: Oct 2007
Posts: 2,092
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From: walpole ma
