i got me a brand new set for $700...the guy at the machine shop did some porting and radiused the valve seats also...they came with screw in studs,guideplates and stainless steel valves...


few questions though....

what type plug you guys use?
intake gasket?
head gasket?
exhaust gasket?:lala:

 

none of you know?

 

I didn't even know that Pro Topline made a Vortec version of thier heads. You could check out thier website www.protopline.com and see if they list the info.

 

Sorry I can't answer your q, but I have one for you.

What do you mean by "radiusing"? Are you talking about the usual 3 angle valve job, or do you mean like totally radiused, smooth valve seats and valves? How much $$ was that?

 

"radiusing" usually means cutting the seats or valves. Now whether or not he radiused them with 3 angles or totally smoothed them out I'm not sure.

 

Assuming the Protoplines use the same plug type as factory
plugs try Champion RS12YC Works for me...

RS9YC for street strip NOS motors.

I use a Felpro 1255 intake gasket, normal felpro .039"
head gasket and Mr gasket 1.5" round header gaskets.

There are multi angle radiius valve seat cutters that create a radius cut angle below the valve seat. Flows more.

Would be interesting to get a flowbench test before you install them to see how they stack up to the factory and Edelbrock
stuff.

 

I also purchased these heads from a place on ebay called alexparts. For 700 I got the heads already machined for dual valve springs, dual valve springs, screw in rocker studs, shims, positive seals, chromoly retainers, manely undercut valves. I cleaned up some flash and mildly polished the exhaust and intake runners. The protopline heads seam like the way to go if you are thinking vortec. They have all the mods already doen for about 200 less than a competent machine shop would charge to modify the stock GM castings.

 

plus they are revised to the exhaust cracking issue

 

Where? It sounds like the perfect head for what I want to do.

 

Go to ebay and type in Vortec heads. Then look for a vendor called Alexparts. This guy is excellent. Drop him an email and he will get right back to you. He does not mind answering questions. The equipment he sets you up with is top notch and he does not mind answering tech question while you assemble and install the heads.

 

match them heads with a comp cams extreme energy 274h cam with 1/6 roller rockers,performer rpm intake...1 inch carb spacer and a 750 edelbrock ...this set up yeilded 442hp@5900roms and 452ft lbs@4400rpms



got this info for this motor from a older car craft mag.....400hp vortec engine

 

i will be installing these this weekend...i'll tell you how good they work!...just got my intake and its a nice peice also...i sprung for the arp ss hex heads vortec intake bolts and they are perty!...only thing i will be doing a lil bit of an extra job on is the valve covers...had to go get some off an older car and they are sorta rough....hope they clean up nice...i am using ac delco r42LTS plugs..anyone got any questions feel free to ask

 

is that 442 hp/452 lb-ft done with a 350, 383, or 400?

 

It was done on a 350, but I thought they used the GM Vortecs, not the aftermarket ones.

 

it was done with a 350 and stock vortecs,...but i got a better set...so maybe i'll get more...dunno...i'll see what this yeilds when i have it dynoed

 

well...its alive


timing might be a lil off...got an exhaust leak somewhere still i believe...but its got some *****!