Can i put a set of 87 corvette alum heads on my LO3 305
#1
Junior Member
Thread Starter
Join Date: Dec 2008
Location: Pahrump, NV
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Firebird
Engine: Had a LO3 305 am now building a 355
Transmission: 4l60
Axle/Gears: 2.73 one wheel spinner...for now
Can i put a set of 87 corvette alum heads on my LO3 305
I building up my LO3. yeah i know, get a 350. well its a good 305 with very low miles on it. so i want to use it up. the whole bottom end was redone and it was bored .30 over so now i want to do the top. i was thinking about these heads with a LT4 cam with .494/.494 lift. Will this setup work? Will the compression be too high?
#2
Junior Member
Thread Starter
Join Date: Dec 2008
Location: Pahrump, NV
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Firebird
Engine: Had a LO3 305 am now building a 355
Transmission: 4l60
Axle/Gears: 2.73 one wheel spinner...for now
Re: Can i put a set of 87 corvette alum heads on my LO3 305
Ok i figured out the these have a 58cc chamber and will work on my 305. They already have 1.94/.150 valves in them. I was going to port them anyways to make sure i get good flow since the eastwood kit is only $30. Next i'm going to put a set of roller rockers on them. I'm thinking that i should upgrade the springs though. With 1.5 rockers ill get .494/.494 lift from the LT4 hot cam i want to put in this setup. Will Z-28 springs work for this or should i go with different springs?
#3
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,119
Received 428 Likes
on
368 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Can i put a set of 87 corvette alum heads on my LO3 305
Ok i figured out the these have a 58cc chamber and will work on my 305. They already have 1.94/.150 valves in them. I was going to port them anyways to make sure i get good flow since the eastwood kit is only $30. Next i'm going to put a set of roller rockers on them. I'm thinking that i should upgrade the springs though. With 1.5 rockers ill get .494/.494 lift from the LT4 hot cam i want to put in this setup. Will Z-28 springs work for this or should i go with different springs?
I ran the very same cam, cylinder heads, and engine in my 5,300 lbs 1983 G20 van with a stock stalled 700r4 and 3.08 gears in the rear end. I had a TPI setup on it and doug thorley tri-Y headers. No shortage of getup and go in the heavy van. I didn't even really get on it hard until about 20-25 mph. In fact if you listen to the video you can tell my poorly "built" 700r4 was slipping badly on the 1-2 shift, so bad it hit the 6,200 rpm rev-limit in the TPI ecm several times. It was in Drive and upshifted 2-3 about 5,000 as well.
http://s243.beta.photobucket.com/use..._1468.mp4.html
This same motor is now in a 1980 Corvette wearing an edelbrock victor jr 4bbl intake, a Holley 650 vacuum secondary carb, stock exhaust manifolds backed to a 2spd powerglide with 2,800 stall converter and 3.73 gears. Still need to do a little tweaking on the car but it runs very well for being a small engine.
Last edited by Fast355; 10-20-2012 at 10:37 PM.
#4
Junior Member
Thread Starter
Join Date: Dec 2008
Location: Pahrump, NV
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Firebird
Engine: Had a LO3 305 am now building a 355
Transmission: 4l60
Axle/Gears: 2.73 one wheel spinner...for now
Re: Can i put a set of 87 corvette alum heads on my LO3 305
I decided to go with a L31 350 with vortec 906 heads, ported with 1.94/1.50 valves, 1.6 aluminum roller rocker arms, forged pushrods, comp cam's 280XFI HR13 that has a .576/5.70 lift with 230/236 durations at .050, Silv-O-Lite short skirt .30 over pistons for a compression ratio of 10:1, Cfm tech's throttle body, edelbrock performer tbi intake, a 2500 stall and 3.73 gears. The motors almost done and then I gotta word on the body since a bobcat ran out in front of me 3 years ago and she's been sitting in the garage since.
Thread
Thread Starter
Forum
Replies
Last Post
kah992
Engine/Drivetrain/Suspension Parts for Sale
2
08-19-2015 02:55 PM