EA's 67 rag top
Apr 9th, 00, 05:09 PM
Can any one give me some insight on good gm heads? Low to midrange rpm motor. 2.02 or 1.94? Do I need screw in studs? What is a good intake runner size for them?I heard that 292,492 are good are they right or others? Thanks!!!!!!!!
PS I would like to use flat top pistons or maybe dome on my 350.Would the dome help or hurt me?
Apr 9th, 00, 05:19 PM
you might want to check out the gm vortec heads. all the magazines like hot rod and cc are always crowing about them for buildups.should be easy to find in the yard or buy new for around $400 a pair bare.
68 camaro,hugger orange ,white stripes.327 4 speed.
Apr 10th, 00, 03:39 AM
I've got some sweet looking angle plug heads if you're interested. It looks like they've been ported and the exhaust ports are round and measure 1-1/2" across! The casting # is 3991492 and they have guide plates with chromemoly pushrods. They are dated A 12 1 and A 23 1. They have titanium retainers and some trick valve springs. These are some serious heads and I'm asking $650. There is just a little carbon buildup on the exhaust valves, but other than that they look real clean. They are still on the motor so I don't know what the combustion chambers look like. I think they are 64 cc chambers, but I'll have to look that up to be sure. Send me an email if you're interested.
Apr 15th, 00, 05:42 AM
I would recommend the Vortec heads. Jim Pace www.paceparts (http://www.paceparts) offer these at $418.02 complete. The stock valve springs will hold up to as big as a .480" lift camshaft. The flow charts I have seen flow better than a Sportsman II out of the box. They will also raise your compression, which maybe too much if you have a flat top or domed piston. You would also have to run a special intake. I would recommend a Edelbrock Performer or Performer RPM. They cost around $175 but much worth it.
Apr 15th, 00, 07:40 AM
Unless you are restoring your car and need factory heads go with aftermarket. Aftermarket performace heads will flow better than camel humps, they have hardened exhaust seats, and are new. You can pick them up for $450 for Vortec heads, Dart S/R's for around $600, and more performance oriented heads for around $1000. The problem with the Vortec head is that you must run a Vortec specific intake, center bolt valve covers, self aligning rocker arms, and a more expensive intake gasket. I wouldn't even consider an old factory chevy head for anything performance, it just doesn't make financial sense.
EA's 67 rag top
Apr 16th, 00, 07:05 AM
Thanks for the information!It helped me out alot.
Nor Cal Mike
Apr 16th, 00, 07:21 AM
I think that domed pistons are prone to detination on todays pump gas. It is better to use smaller chamber heads and flat top or even dished pistons to achieve desired compression ratio,probably not more than
9.5/1 for the power range you stated. Aluminum heads are good for about one extra point in compression. I read somewhere that 305 heads (probably L69) work really well up to around five grand. I used to have a 350 with Vortech heads (I didn't even know what they were at the time) that ran really well and got great milage.