What is the rundown on your bottomend.
How many kays has it done?
Has it been balanced?
Standard balanced bottomends(with ARP rodbolts) will handle 6500rpm with ease and more.
How are the heads. if they have the standard valves, definatly keep the rpm to a decent level like 5500 max. Just remenber that 250rwhp is very stout on the street. I wouldnt build around a RWHP figure, but instead for your intended use. You will never make 300rwhp at 5000rpm. Again your heads will play the biggest factor in your hp/rpm levels.
I beam rods and 4V's not required for your application. Just stock rods with ARP rod bolts will suffice with a mains stud kit for bottom end strength. Hyper pistons will be fine for 300hp.
You running an auto or manual in your ZA? You probably have stock 2.9 diff gears? Some 3.5's would really assist in acceleration.
Your 2V CC's will be OK. Have they had any port work done? Do they have screw in studs? or roller rockers? Personally I wouldn't be taking stock rockers to 6500. I'll assume you have heavy duty retainers and valve locks with your upgraded springs and valves. Make sure the valves aren't just soft stock replacements otherwise you could lose one at those revs. Need good pushrods too.
Is it a stock 302 XD? It would be lucky to pull a 16-17sec 1/4 mile!! You'd spank it (him), even on 7 cylinders.
Your carb/weiand/cam sound good. You'll need some extractors and a good twin system exhaust.
Starting to get into the bigger cam range, you'll need to look at a higher stall converter for it to work at its best. ie: may bog down off the start.
how much are you looking at spending? we build clevo's on the side and for around $5000 should give you 300 to 350 rwhp. we not long finished a 351ci mild port 2v's with 4v valves s/s ext running on pulp, hyper pistons, arp rod bolts & main studs, hi volume oil pump, crane F246 solid cam, moloy push rods, new bearings, rings, balanced bottom end, the bloke had bolt-on yella-terra roller rockers, a weiand x-celrator and 750 dp holley. the c4 that it was fitted to had a 3500 stall st3 shift kit with a 3:5 diff ratio he fitted it into an XF and it runs a 12:2 quater and revs to 7000 rpm all day, he is stoked.
I think he can get the 300RWHP under 5,000rpm though. with the right combo that should be easy...
I wish i could could. I have got a fair bit of motor and just makes over 300rwhp at 6900rpm.
I would like to see any guy making a max of 300rwhp at under 5000 rpm. Because if 351ZAFairlane is realistically going to make 300 at the very most if that, it will be up towards 5800 rpm at the least. Maybe if they made 450 rwhp, and did the 300 by 5000rpm, it is still way unrealistic.
Still, nothing too unstreet worthy doing 5800-6000rpm.
I am making 320.3rwhp now at 4,600rpm.
my motor can rev to 6,000+ (my limit) but i havn't got the fuel setup to do it yet :( cam makes power to 5,800 though so no need to go any more..
i read my post and reliased that my setup/cam isn't really what he is looking for, as it starts at 2,800 with a limit at 5,000 that isn't much fun. depends on the person and how they like the rev the f*rkr i guess
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