GT40 heads good deal?

[oneslo5o]

I know someone who will sell me a set of iron GT40's (not P's) for $200. I have not seen them but am told one head has a worn valve guide and the springs are worn. No rockers come with the deal. I know new springs would be smart anyway since I would install an e cam with the heads, along with a cobra intake. My questions are with the valve guide. I don't want to spend another $400 rebuilding the heads, or else I would just go with alum in the first place. Including new springs I don't want the total investment to go over $350 (not including rockers). Things I'm wondering:


1. Do GT40's have replaceable guides or would machining be required?

2. If replaceable, where would I find one and can it be done at home?

3. Does this worn valve guide still make this a good deal, if so should all guides be replaced?

4. What other cheap repairs should be done to the heads?

Any help would be appreciated.

 

[Foxfan88]

the guides are part of the head, machined in the metal. So you could have to have a machine shop drill you out and put new replacable guides in.

I think 200 is great deal, i think the gt40s are underrated heads by far.
i would get them dipped, magnaflux, inspected real good, replacing worn parts like the guides. and valve seals are easy.

get a basic 3 angle, milled, mild port and polish, port match and your good to go.

the work you might need might cost a couple hundred, more if you want them ported. But it will be a solid, performing head.

 

[RYC CUKR]

A new spring kit will run you around 100-130 for the kit. I believe that my trickflow kit was 120 and I put the springs on and all that fun stuff.

With any used head you should really get at least a 3 angle valve job. That, springs and the price of the heads will probably put you over your $350 limit. That said I think that they are good heads. I would call around and find out how much a valve job and repairing the retainer are going to cost and then you will have a better idea. If it starts getting up around 500-600 for everything I would save up for some aluminum heads.

 

[rd]

I have 2 sets of iron GT40's, and recommend them.

The valve guides can be replaced just like all other iron heads. Standard machine shop work.

 

[fidstang]

My GT40 irons cost $200.00 and the machine work, magniflux, 3angle valve job and everything inspected cost me $300.00. I did the port match, smoothing of ports and bowl blend myself before the shop got them. I bought better springs and gave them to them to install. They cost me $123.00 with a grand total of $623.00. It was worth it for me and it got me over 300rwhp! Can't wait till I get my powerdyne!