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well i searched the site and google but was unable to find 2 things. im going to rebuild the heads and use them(unfortuneately) for about a year or so. i can not however find the stock sping dimensions or the length of the valves. i know its 1.94/1.5 76cc heads but i just need that last bit of info to get some parts priced and ordered.
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Unless you have some really weird application, you'll never get a valve that's shorter than stock. The shortest length available is stock.
Longer valves are available for longer and wider springs. They will allow for more lift on the cam, higher spring rates and will have a higher installed height. They will also change the valve train geometry changing the length of the pushrods required.
Ask your local machine shop on the cost to rebuild and install new valves, springs etc in the head. Then price out a set of factory assembled replacement heads. The replacement heads will probably be cheaper.
993 is a decent stock head, just have them redone, maybe some 2.02/1.60, shave down to 70cc. and a little port matching and wa-la! We run them on our round track cars. 882,993, and 441 are the best we can run (441 being the best of the 3)Andthat way you can spend a little bit of money at a time instead of a bunch all at once
Stock replacement heads are not that much. You can get a new set of iron vortec heads for $600 fully assembled and they'll be much better than those 993 heads.
Ask your machine shop how much a new set of valves and springs will be plus the cost to assemble and machine the heads to new specs. Even if it's close to the same price, the aftermarket heads will still be better to use. The only way assembling old, used heads is worth it is if you can get parts dirt cheap and do all the machine work yourself. There's more to it than just putting valves and springs onto the heads.
im rebuilding the engine but dont have enough money to buy new heads. do you think i should put any money in these (use them as is for a little while) and wait to get some good heads?
993 is a decent stock head, just have them redone, maybe some 2.02/1.60, shave down to 70cc. and a little port matching and wa-la! We run them on our round track cars. 882,993, and 441 are the best we can run (441 being the best of the 3)Andthat way you can spend a little bit of money at a time instead of a bunch all at once
here you go. unless you want a 64cc head,461,462,186,041,291, and so on......but good luck finding these, and you'd still need them checked out and probably at least valve job and seals
Yeah, But if he finds Vortech heads hes gonna have to buy a new intake. Is that in his budget?
lol i have like $3000 in my cart at summit. more then i want to spend but an intake is in that price all ready. so i would just have to change it. for all your input guys. ill shop around the junk yards and call the machine shop and get an estimate to get the heads worked.
theres a fort about 2-3 hours away. there might be a few small bases around here to. i found some one who just bought some new heads for a stroker but never installed the engine. he paid about $900 so we will see how much he will want for them. they are world heads, they any good?
World products are pretty good but my block and heads are made by Dart. When I purchased my block, I liked the Dart block better than the Merlin block.
I was asking cause a friend of mine signed up and was sent to MO for basic. Figured if you were close you could go slap him up side his head!LOL. I have a stout 355 I can sell you fairly cheap, but it wont run on 93............Thats why I'm not using it. Didnt realize the compression was so high. Some where between 11.7:1 and 12:1. I dont want to spend more money on another set of heads to lower the compression
yeah basic is in texas but their is trainging, i cant remeber what its called, here in mo. its basically to learn to drive all kinds of vehicles. busses, forklifts and what not.
that second set isnt assembled. what abou tthese they seem to be similar in specs. http://www.summitracing.com/parts/SUM-152123/ otherwise i will probly do what you said and buy some of the gm preformer heads.
Quote:
Originally Posted by Stephen 87 IROC
Stock replacement heads are not that much. You can get a new set of iron vortec heads for $600 fully assembled and they'll be much better than those 993 heads.
Ask your machine shop how much a new set of valves and springs will be plus the cost to assemble and machine the heads to new specs. Even if it's close to the same price, the aftermarket heads will still be better to use. The only way assembling old, used heads is worth it is if you can get parts dirt cheap and do all the machine work yourself. There's more to it than just putting valves and springs onto the heads.
for all your input guys. ill shop around the junk yards and call the machine shop and get an estimate to get the heads worked. 
