VT 304 cam question

[AlwaysNeedHelp]

Hey guys I’m 17 and tearing down my 304 from my vt and wondering if anyone has used either of these cams I’m thinking going the 888271 for the rough idle but what would be easiest to tune on the factory ecu? I don’t really want to get a haltech mainly as I’m not looking for hp numbers more just a tough weekender, And what supporting mods would be recommended

Any help appreciated
Cheers

 

[Phillbert]

There is a post in the V8 Development and Modification section of these forums called
Stock 304, Guide to choosing a camshaft you might find it interesting to read though

 

[Immortality]

Those cams are way to big for a stock motor, now throw in a set of new pistons, get the compression ratio up to a nice healthy 10.5:1, a decent intake manifold, some head porting for good measure and complementing valve train along with a good exhaust and then they'll work.

Sure it can be tuned on the factory PCM, just need to find a tuner that will work with the factory PCM's.

 

[Deuce]

Hey guys I’m 17 and tearing down my 304 from my vt and wondering if anyone has used either of these cams I’m thinking going the 888271 for the rough idle but what would be easiest to tune on the factory ecu? I don’t really want to get a haltech mainly as I’m not looking for hp numbers more just a tough weekender, And what supporting mods would be recommended

Any help appreciated
Cheers

They are both on a 110 lobe centre, so basically are you building it to 10-11.5 comp or 10.5-12 comp. That will answer your question.

My 2c, build 11:1 comp, go that first cam, and see if they can regrind narrower (108°)

 

[NORTI]

Might be easier in Vic, but finding a tuner that will still tune the factory delco is hard over this way. So Haltech is gaining more customers even with minor mods just so a tuner can be found easier.

 

[AlwaysNeedHelp]

Those cams are way to big for a stock motor, now throw in a set of new pistons, get the compression ratio up to a nice healthy 10.5:1, a decent intake manifold, some head porting for good measure and complementing valve train along with a good exhaust and then they'll work.

Sure it can be tuned on the factory PCM, just need to find a tuner that will work with the factory PCM's.

Yeah well she is currently running flat tops with standard bottom end, has yella terra shaft mount roller rockers, bigger springs, ported heads, the starr 100mm banana manifold and a few other things that I can’t remember off the top of my head

 

[Immortality]

Well it sounds like you are part way there but you'll need to check the valve springs are suitable for the cam but that intake isn't really ideal for high revs.

 

[Deuce]

Well it sounds like you are part way there but you'll need to check the valve springs are suitable for the cam but that intake isn't really ideal for high revs.

No, but with a stock bottom end, how high would you go on a 3.02 stroke crank.
I went 6200+ with 70mm t/b on banana Mani, 3.48 stroke.

I reckon he'll get the odd run to 7k

 

[vr304]

Yeah well she is currently running flat tops with standard bottom end, has yella terra shaft mount roller rockers, bigger springs, ported heads, the starr 100mm banana manifold and a few other things that I can’t remember off the top of my head

Do you actually know what your compression ratio is? even with the flat top pistons if the block hasn’t been decked to get the pistons level at top dead centre (0 deck height) then the compression ratio will still be relatively low, heads may have been decked when the port work was done?
those cams are on the large side and won’t be very street friendly you’d really be better off going for something smaller

 

[Immortality]

No, but with a stock bottom end, how high would you go on a 3.02 stroke crank.
I went 6200+ with 70mm t/b on banana Mani, 3.48 stroke.

I reckon he'll get the odd run to 7k

I'd do the rod bolts if it was going to live at the high rpm that cam will like.