L-31 vortec heads???
Thread Starter
Racer
Joined: Mar 2001
Posts: 326
Likes: 44
From: Newberg,Oregon,U.S.A.
L-31 vortec heads???
I have located a set of L-31 vortec heads w/manley valves 2.0/1.6 and a RPM intake , Iam thinking of putting them on my stock 8.5-1 L-48 when I put in a XE258 cam kit, has anyone done or know about these heads? Iam also in an emision state :mad , I dont know the cc of the chambers but I hear they flow better than stock and are cheaper than alum. heads,any advice would be appreciated :yesnod:
Instructor
Joined: Sep 2001
Posts: 204
Likes: 0
From: winston salem nc
Re: L-31 vortec heads??? (stingraynick75)
These are the vortec truck heads, very popular cheaply priced addon. These are great heads for the $$.
This production Vortec iron cylinder head was first used on the 1996 pickup truck RPO L31 with fuel injection. The intake and exhaust port are very similar to Corvette 350 LT1 heads. This head includes 1.94" intake valves and 1.50" exhaust valves, with pressed-in 3/8" studs. This head with compatible valves flows more air than bow tie head P/N 10134392, but the casting may not be as durable. The water passages are the same as the original 1955 small block design. The eight-holt intake bolt pattern is totally different than the early model V8 12-bolt design.
These heads will bump you up 1-2 points cc wise. You mentioned Emissions required and here is the biatch of it.
1. the edelbrock performer rpm intake does not come with EGR fitting, so if you use this intake your egr is gone, and egr is the primary emissions on a 75 is it not?
2. These heads do not have emissions passages. They require an adapter to be ran with a egr intake. I think Sallee chevrolet can provide more info on it. Not many chevy places are familier with this egr kit for the heads, but Sallee does if I remember correctly.
This production Vortec iron cylinder head was first used on the 1996 pickup truck RPO L31 with fuel injection. The intake and exhaust port are very similar to Corvette 350 LT1 heads. This head includes 1.94" intake valves and 1.50" exhaust valves, with pressed-in 3/8" studs. This head with compatible valves flows more air than bow tie head P/N 10134392, but the casting may not be as durable. The water passages are the same as the original 1955 small block design. The eight-holt intake bolt pattern is totally different than the early model V8 12-bolt design.
These heads will bump you up 1-2 points cc wise. You mentioned Emissions required and here is the biatch of it.
1. the edelbrock performer rpm intake does not come with EGR fitting, so if you use this intake your egr is gone, and egr is the primary emissions on a 75 is it not?
2. These heads do not have emissions passages. They require an adapter to be ran with a egr intake. I think Sallee chevrolet can provide more info on it. Not many chevy places are familier with this egr kit for the heads, but Sallee does if I remember correctly.
