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Joined: 3/19/2008
Posts: 192
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I dont know alot about machine work, but im pretty sure i can get my heads "bored" out to .202 heads, right now im at .196 i believe...... So my question is for some of you guys out there who have done it, is it cheaper to have the machine work done, put bigger valves in. Or Just buy a new set of heads from Summit or Jegs? And also, if i upgrade my heads, should I put a little bigger cam in it? Better Intake? The Guy that is going to do the machine work comes highly recommended from alot of the local race car drivers, so i think im ok as far as a good machineist. Just wanted to know your thoughts out there! Thanks for the input!
*LIFE MEMBER*
"It was the roar of your engine, not the ring on your cell phone." Brockport, PA
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Joined: 3/19/2008
Posts: 977
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Hey 68, have you gotten a price from the machine shop yet on how much it will cost to modify your heads? If the cost gets high enough, aftermarket aluminum heads could be a better option.
And a better cam and intake than what?
chuck@streetmachineforums.com
"Objects In Mirror Are Slower Than They Appear"
393 Stroker, Tunnel Ram, Dual Quads and other Goodies
Charter Member Since 2/22/05 Chicago
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Joined: 3/20/2008
Posts: 287
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68, I agree with Cam, to make the OEM heads perform to max you would also need to port them. By the time they get the bigger valves in and porting done, and springs and screw in studs...and...and.... You could buy a set of aftermarket heads that still flow better than the stock heads, and are already set up with better springs, and able to handle higher lifts of bigger cams.
As far as cam and intake, you dont NEED to change anything , but do you WANT to change them? With a good set of aftermarket heads you should be able to run a bigger cam with much more lift than with stock heads. Unless you go with a BIG cam, a good dual plane intake is all you need. Not sure what you have now. ?????
Doc......
Live by Murphy's Law, it keeps life interesting.
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Joined: 3/21/2008
Posts: 135
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68, I also agree with these guys. I have thought of the same thing recently in the past. It was cheaper to buy better flowing iron heads. Most heads that you might be able to enlarge the valve diameters do not have very good exhaust flow, most heads that we can get locally are mid 70s and later. they have a big hump in the exaust runner and intake runners need alot of porting. I have over 100 hours in the set on one of my vehicals that are a good flowing set. You can also stop in the local machine shops to see if they have any sets or can get you a set. I live in B.F.E. and i can get an ok set for about 5-6 bills out the door. Post a casting # and Im sure one of us could tell you if they are good or not. good luck
Herron, Michigan
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Joined: 3/19/2008
Posts: 192
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Thanks for the reply guys, i think ill just save up some cash and go for one of those top end kits from edelbrock. Comes with Heads, Cam, Intake, rods/lifters, and all the gaskets for it. About $2000 for the kit i want, they say it will take it up to 435hp on a 350....Weather thats true or not, im not sure. But comming from Edelbrock, I would say they are pretty close. But like you guys said, i could have that much wrapped up in machine work and new valves/springs/lifters/rods anyway.
*LIFE MEMBER*
"It was the roar of your engine, not the ring on your cell phone." Brockport, PA
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Joined: 3/19/2008
Posts: 114
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That's what I did I bought a Trick Flow top end kit from Summit, for $1,600. That was an '07 price.
Fred (Shark)
*Life Member* since 3/28/06
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Joined: 2/2/2009
Posts: 2
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first of all,, the term "bored" is usually used for the engine cylinder bore machining. you are probably refering to "reseating" and "porting". most street engines will never see the rpm range necessary that would justify this type of machining. the amount of money spent as well as the qualifications of the person doing the machine work play an important role in justifying the work done. if i were you, i would purchase aftermarket heads with the specifications taylored for your application. heads nowdays are designed to operate on available pump gas. i personally own a 1970 Z 28 camaro with an LT1 motor. this motor has 2.02 x 1.6 valved heads. there has been no porting done other than port matching to the intake and exhaust. the engine has 11.1 compression and a 30 30 chevy cam. I built another 350 engine using the same 5.7" rod, steel crank and aftermarket heads and matching cam/ intake combo. the torque and horsepower not to mention the drivability was far exceeding the LT1 combo. But hey,,, we are comparing 1970 technology to 2009 technology. i personally believe you would be better off using newer technology vs old school, unless you are keeping up with nostalgia like us old guys. LOL. Just my opinion.
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Joined: 5/3/2008
Posts: 1
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jasmaz nowes what hes talking about listen and learn
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