Dirt track heads?
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Joined: Feb 2002
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From: Buffalo, New York
Car: 88 Camaro
Engine: 305TBI
Transmission: Stock
Axle/Gears: 3.42?
Dirt track heads?
Can someone take a look at this and tell me what you think?
http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT
A while back I got a rebuilt motor with a rebuilt set of 305 heads.
Casting no 354434 262/267/305 heads 1.7 In and 1.5Ex
Are these the same thing?
How can you put such big valves in a 305 head? Or can you but now they have to be used in a 4" bore motor?
I did not think my heads had any performance potential so I got different ones ( '601 castings)
Did I mess up and overlook what I already have?
http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT
A while back I got a rebuilt motor with a rebuilt set of 305 heads.
Casting no 354434 262/267/305 heads 1.7 In and 1.5Ex
Are these the same thing?
How can you put such big valves in a 305 head? Or can you but now they have to be used in a 4" bore motor?
I did not think my heads had any performance potential so I got different ones ( '601 castings)
Did I mess up and overlook what I already have?
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Joined: Jan 2002
Posts: 3,852
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From: Valley of the Sun
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Those are the same heads as your 434 but with bigger valves. For the bigger valves to have any effect the chamber and blow need to be ported and unshrouded. It would not be a good idea to run those on anything other than a 4" bore motor. The valves will simply be too close to the cylinder wall restricting flow below smaller valve values.
Thread Starter
Member
Joined: Feb 2002
Posts: 147
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From: Buffalo, New York
Car: 88 Camaro
Engine: 305TBI
Transmission: Stock
Axle/Gears: 3.42?
So is it the valves and higher compression ratio that make these heads good performers? or is it the combustion chamber shape?
Are these heads (when stock) any good for a 305 ?
Are these heads (when stock) any good for a 305 ?
Thread Starter
Member
Joined: Feb 2002
Posts: 147
Likes: 0
From: Buffalo, New York
Car: 88 Camaro
Engine: 305TBI
Transmission: Stock
Axle/Gears: 3.42?
So what would perform better?
A set of 601 casting 305 heads with oversize intake valves 1.94 x 1.5 or these 354434 but in stock form with 1.7 and 1.5 valves or the stock heads on my LO3 '88 tbi motor?
I am assuming the '601's are best, the 354434 next in performance with the TBI heads the worst right?
A set of 601 casting 305 heads with oversize intake valves 1.94 x 1.5 or these 354434 but in stock form with 1.7 and 1.5 valves or the stock heads on my LO3 '88 tbi motor?
I am assuming the '601's are best, the 354434 next in performance with the TBI heads the worst right?
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
For a budget built 305 the 1.94x 1.50 valve combo is best.
I perfer the 416 castings. For a 350 use 1.94 x 1.60"
Apparently according to some that have reworked and flowed these heads, the TBI heads when ported have good street performance potential and flow. I've never flowed them thou.
The 2.02 valve is overkill in a 305 head wether for the 305 ( not recommended) or a 350. The 1.94's flow plently otf air (when combined with porting and a quality valve job) and require less unshrouding and the head is more durable.
The 2.02 valve is way too close to the 305 bore wall.
I perfer the 416 castings. For a 350 use 1.94 x 1.60"
Apparently according to some that have reworked and flowed these heads, the TBI heads when ported have good street performance potential and flow. I've never flowed them thou.
The 2.02 valve is overkill in a 305 head wether for the 305 ( not recommended) or a 350. The 1.94's flow plently otf air (when combined with porting and a quality valve job) and require less unshrouding and the head is more durable.
The 2.02 valve is way too close to the 305 bore wall.
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