Need help with accessory hole probs

[sir_talk_alot]

so im looking at beefing my 350 up abit. its got average heads on it. i have a/c and the alt bolted to my heads. im looking for some double humps now to bump some power, but most of them dont have accessory holes and id like to have my a/c system on my truck. any suggestions? and who all has had experience with the smallest of the thumpr cam from comp? im looking for double humps, new springs, thumpr cam, i have an aluminum intake, and prob a 650-750 carb, whats the hp roughly? and anyone with the small thumper and 58cc 305 ho heads? thanks, mike

[oldblue1968chevy]

Im running the 279 thumr with vortec heads. I have a vodoo cam that should be here tomorow sometime to swap it out. Its been broken in and always changed with the zinc VR1. When I pull it i'll keep the lifters in order so someone can use it. If your interested i'll cut you a great deal when I get it pulled (soon? )

If I were you id shoot for something more performance oriented..

[rsavage]

I have not done it personally, but it is my understanding that accessory holes can be drilled and tapped by a machine shop. You might be better off buying some complete performance heads through Summit for example. You might end up cheaper than buying the double hump heads and then having the machine work done on both the accessory holes and valves. Another choice might be Vortec heads but you will need to have an intake that is made to fit the vortecs. I sold a set of double humps a couple of years ago for just this reason.

[PanelDeland]

I agree with the aftermarket heads.The choices are wide and you can probably buy a set for just about what a set of heads and machine work will cost you.Check with the head co and see what will work well for your situaton.You might also look at the Edelbrock kits that have cam,heads intake and carb.They're matched to give X HP for the application.You could probably sell the stuff you have to help offset the cost.

[sir_talk_alot]

Originally Posted by oldblue1968chevy

Im running the 279 thumr with vortec heads. I have a vodoo cam that should be here tomorow sometime to swap it out. Its been broken in and always changed with the zinc VR1. When I pull it i'll keep the lifters in order so someone can use it. If your interested i'll cut you a great deal when I get it pulled (soon? )

If I were you id shoot for something more performance oriented..

thats the smallest of the thumpers, and lifters? yea def interested. pm me your price and ill think about it. summit has the thumper for 139 and i was gonna use my existing lifters. does it matter that it has been used with vortec heads or will they drop in my old block just fine? and how many miles have been put on it? hyd flat tappet?