heads
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Joined: Jul 2004
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From: Hopatcong, Nj
Car: 1986 Camaro IROC-Z
Engine: 305 tpi
Transmission: BW t5 W/ short shifter
Axle/Gears: 9 Bolt 3.27 posi
heads
ok i have a set of corvette heads #113, these heads are stock with 0 miles. they came off a zz4 crate motor. I heard some rumors they will fit onto a 305, which i have. now the 305 is brand new, 700 miles, bored 0.030 over. i think its a 350 cam in there now, but if i was to put these heads on it the cam would change and i would be adding tpi. does anyone have any experience or info on this? this idea is not set in stone, please no comments on oh its a 305 blah blah blah, i cant afford a 350 right now and i would like to retain the 305 because it is stock to the car. Thanks
Last edited by nascar2496; Jun 5, 2008 at 02:03 PM.
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Joined: May 2002
Posts: 845
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From: Northern California, Redding
Car: Red 1987 IROC Convertible
Engine: 305 LB9 TPI
Transmission: T5 5-Speed
Axle/Gears: 9-Bolt 3.45
Re: heads
You need to find out what size valves and combustion chambers (cc's)the new heads have.
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
No need to "find out". They have 58cc chambers, 1.94"/1.50" valves.
They will fit. Since the heads are aluminum, which transfers heat more readily than cast iron, it will be an effective lowering of compression on a 305. Remember, those heads were used on a 350, and the 350 had 64cc chambers when cast iron.
Exactly what "350 cam"? There are a bunch out there, and many are worse than 305 cams. Need more specifics.
Most likely you can bolt the heads on and go. Should run a little better than stock 305 heads with cam & exhaust upgrades because of the larger intake valves. Hopefully the engine was rebuilt with stock-like flat-top pistons and not the typical dished rebuilder pistons.
(By the way, it's "0.030 inch over", not .30". Can't bore the typical 305 .30" over.)
They will fit. Since the heads are aluminum, which transfers heat more readily than cast iron, it will be an effective lowering of compression on a 305. Remember, those heads were used on a 350, and the 350 had 64cc chambers when cast iron.
Exactly what "350 cam"? There are a bunch out there, and many are worse than 305 cams. Need more specifics.
Most likely you can bolt the heads on and go. Should run a little better than stock 305 heads with cam & exhaust upgrades because of the larger intake valves. Hopefully the engine was rebuilt with stock-like flat-top pistons and not the typical dished rebuilder pistons.
(By the way, it's "0.030 inch over", not .30". Can't bore the typical 305 .30" over.)
Thread Starter
Member
iTrader: (2)
Joined: Jul 2004
Posts: 295
Likes: 0
From: Hopatcong, Nj
Car: 1986 Camaro IROC-Z
Engine: 305 tpi
Transmission: BW t5 W/ short shifter
Axle/Gears: 9 Bolt 3.27 posi
Re: heads
No need to "find out". They have 58cc chambers, 1.94"/1.50" valves.
They will fit. Since the heads are aluminum, which transfers heat more readily than cast iron, it will be an effective lowering of compression on a 305. Remember, those heads were used on a 350, and the 350 had 64cc chambers when cast iron.
Exactly what "350 cam"? There are a bunch out there, and many are worse than 305 cams. Need more specifics.
Most likely you can bolt the heads on and go. Should run a little better than stock 305 heads with cam & exhaust upgrades because of the larger intake valves. Hopefully the engine was rebuilt with stock-like flat-top pistons and not the typical dished rebuilder pistons.
(By the way, it's "0.030 inch over", not .30". Can't bore the typical 305 .30" over.)
They will fit. Since the heads are aluminum, which transfers heat more readily than cast iron, it will be an effective lowering of compression on a 305. Remember, those heads were used on a 350, and the 350 had 64cc chambers when cast iron.
Exactly what "350 cam"? There are a bunch out there, and many are worse than 305 cams. Need more specifics.
Most likely you can bolt the heads on and go. Should run a little better than stock 305 heads with cam & exhaust upgrades because of the larger intake valves. Hopefully the engine was rebuilt with stock-like flat-top pistons and not the typical dished rebuilder pistons.
(By the way, it's "0.030 inch over", not .30". Can't bore the typical 305 .30" over.)
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
See sig.
The ZZ4 cam only works if the block is a factory roller type.
The ZZ4 cam only works if the block is a factory roller type.
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