mild 460 build up.

HI ALL
I'm wanting about 450 to 500 streetable hp with matching + tq. Its going in to my 4010 lb. truck in sgnature. Hears what I have so far..
A 77 460 block with D3ov A2A heads. I'm think just gasket matching and exaugh bump removel.
Stealth intake (duel plane), 750 carb duel feed vac secondaires. Truck rods, stock pistons. 268h comp. cam, and Headers, Roller Rockers and (Roller cam gears <for a 70 ). Is there any special rebuild kit I should get?? or just a good quality one. The truck is a daily driver mostly (town and highway), will see some track time and as you all know some light to light. Any sugestions will be appreated.[img]/phpBB/images/smiles/icon_smile.gif[/img]
Thanks
Tim
[addsig]

Thanks chilly460
You say the cam may be a little small, So should I get a slightly larger cam to more easyly make the 450 to 500 hp ? I would like a loppie idle too, if so what size?
Zero deck the block? [img]/phpBB/images/smiles/icon_confused.gif[/img] (I'm guessing a machine shop will know how to do this..) But I was thinking to keep the cr sort of low to run lower octain fuel and steal make hp and tq. What do you think?[img]/phpBB/images/smiles/icon_confused.gif[/img]
Thanks

Stock Compression on that motor will allow you to run regular, those heads ar eopen chamber, so increasing compression will make it much more likely to ping. On the opposite side of that, pistons not being flat with the deck are more likely to cause pinging then if they had been put at 0, even though the compression goes up. Dont ask me how, But Its what I've always been told.

So ya think that 268h is a lil small? I've got one in my 460 and it has no torque curve, darn near flat all the way across. Does drop off about 4800, but hey, its a truck engine. Only real bad part of this much torque is I cant get traction till around 55 when I hit 3rd. Im runnin a 33 x12'' tire, and they spin like a cobra runnin Donuts at the track. Actually wish they hook better, they spin all the time, and not only am I attracting the attn of cops, Im also goin through $130 tires like crazy. Maybe a welded diff.......
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0 deck is good. Seriously look at a set of flat-top pistons as well. No dish. I've seen 10.5:1 460's run 91 and have good power with no detonation. I've also personally had an 9.2:1 460 with KB hypereutetic pistons and D3 heads ping like a mother on 91! The KB just push the pin up, they still have a dish. Avoid that, go for true flat tops, 0 deck, work your D3's over, a good exhaust system and you're rollin'. If you go with a cam much bigger than a 268-ish, run rear gears that match. Long duration, big overlap cams and road gears don't mix. Good luck.
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The combination you are describing is one that I almost duplicated a few years ago in a 83 f100. Very toruqey motor, except mine was only 8.5 compression. Since, I've updated to roller rockers, D0VE heads w/2.24 intake and 1.75 exhaust valves, 10:1 compression, and a 234/244 @.050 cam. Lift is around .580". It pulls well from 2500-5500, really comes on at about 3000, and levels off at around 5200. Best 1/8 time in a 4000 lb truck is 8.20/95mph. Oh, and I'm using 2.75 rear gears and a 2500 stall converter in a c6. Also, it idles a bit rough, enough to get your attention, and cruises all day @ 2400 rpm on the freeway. Mileage sucks, though, but then again it's a 460.

don't forget to buy a roller chain that you can install straight up. I think 77 falls under smog era retarded timing, just killed the power.

Thanks all
Now I have some things to go over with the shop here.[img]/phpBB/images/smiles/icon_smile.gif[/img]
I think I'll go with true Flat top pistons,Truck rods, do I have to 0 deck or can it just be like 1/2 the quinch to incress the comp just some??
Thanks
Tim

The 268H is a good cam for a 460. I had one in my first 460, in a 1979 f150, a very strong performer with 10-1 cr,,, However CompCams now makes MUCH BETTER CAMS. Look at their new cams and call them for advice.

No matter what brand of cam you choose for your 460, when you consider the flow charactarists and flow balance between the intake and exhaust ports, even on ported 460 heads, you should choose a cam that has between 6 and 12 degrees more duration on the exhaust than there is on the intake. As well, it's usually better to choose a cam with wider lobe seperations angles for 460's than would normally be chosen for other engines and install the cam 4 to 6 degrees advanced. This gives more exhuast flow earlier in the exhaust cycle and reduces overlap. Lots of overlap on an exhaust flow limited engine doesn't do a lot of good anyway, it simply costs some low end torque.

UP DATE<U></U>
OK[img]/phpBB/images/smiles/icon_smile.gif[/img] The Head... I think I'm going to Grind out the exhaugst bump,go with the 1.75 exhaugst valve , I don't think I'll gasket match You only gain 10 ths. I think my money would be better spent on increseing the intake valve to next size. Now if I do this would I better off a Comp275DEH Instead of the 268h? to more utalize the bigger valves? Thanks Mach 1 I'll get ahold of comp/cams and talk to them...)
Tim