head work ?
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Member
Joined: Dec 2002
Posts: 212
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From: Bentonville, Ar
Car: 1991 RS
Engine: 305 TBI
Transmission: auto
head work ?
getting ready to start on my heads. Do I want to get the valve job done first and since I am talking about a 305 I'm goona have tha valves opened up to take 1.94 valves, before I do the prot and polish work.
Thanks Scoty
Thanks Scoty
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Joined: Sep 2001
Posts: 6,111
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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
You can do it either way.
Port the heads first, then take them in for a valve job etc.
Make the bowl a little smaller than the stock 1.84" valve seats'
lowest cut. This will work out just about right with the new larger 1.94" valve seat.
Or have a shop "bowl hog" and cut new seats for the larger valves and then port them. (Will save you some time.)
They may want to have the new valves in hand first to establish the actual seat location. ( makes a difference)
Some shops will "touch up" a seat or two after for ya if you get carried away and nick a seat while porting.
Port the heads first, then take them in for a valve job etc.
Make the bowl a little smaller than the stock 1.84" valve seats'
lowest cut. This will work out just about right with the new larger 1.94" valve seat.
Or have a shop "bowl hog" and cut new seats for the larger valves and then port them. (Will save you some time.)
They may want to have the new valves in hand first to establish the actual seat location. ( makes a difference)
Some shops will "touch up" a seat or two after for ya if you get carried away and nick a seat while porting.
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