Hydrualic cam upgrade for 2v 250.

[2v XLE]

Currently running a crowcam 214degrees@0.050" on the 2v with a holley 500. Engine was fully rebuilt 5000kms ago with lots of headwork, 40thou over block, msd ignition, balanced, etc.

Now I'm thinking of upgrading to something like a 230ish@0.050" and running a holley 600. Looking to make good power upto and around 5500-6000rpm. Is it as simple as new camshaft and lifters, or should I look at new retainers etc, as well. It was all new 5000kms ago so not sure if its essential i have to replace everything or not?

Cheers.

 

[aussie7mains]

Hi, I know where Mirboo north is, nice part of Australia.
Id say youve already got the ideal cam for your engine, and I wouldnt advocate you go any bigger unless you go triple webers as it will get very rough down low and sggy response as well.
The 500 holley is probably a bit of a liability as it is, its a lot of carb for each ctlinder to have available to use. A couple of smaller carbs might work better, even your 600 being a 4 barrel might wok better down low.
My experince with 250-2vs tells me the that triples wok best by far, all the torque comes back they idle smooth and have the tp end as well. Dont let people tell you they are difficult to deal with, once set up they are really good, think Alfa, and 265 hemi.
Hoping this helps a bit.
A7M

 

[2v XLE]

Yeah Mirboo North's not a bad spot, but I don't live there anymore - just haven't updated my profile yet

Hmmm... Briefly considered triples. Had a triple weber manifold at one stage, but there's not a lot of room under the corty bonnet between the head and the brake booster. Remote booster was always an option i guess.

Yeah a few people have suggested not to go too big with the cam on the 2v. Maybe instead of the 230deg cam, crowcams do a 223deg@0.050 2100-5500. Virtually the same lift as the cam i got (0.442 compared to 0.448 on the 223) but obviously longer duration. Probably a bit more suited to my 2v motor. Driveline will be toyota supra 5 speed (3.57 1st gear) and 2.92lsd in the back, so down low shouldn't be a problem with the 223 cam.

If i used the the 223 cam, would the 600 be too big, or would a 465 be better suited?

Cheers.

 

[aussie7mains]

Xle, Ive had a TC xle with 250-2v head on a 221ci six, I had triple dellortos on a home made VERY short manifold which just cleared the brake booster without an air cleaner on the back carby. i had a much bigger mechanical tappet cam than your talking about, but it was drivable. I had the same engine with a 500 holley which wasnt drivable.
the stock 250-2v with 500 was really good for scaring v8s as its low speed torque was really very good, It was toploader box and 2.92 axle.
Ill have a look at crows cams a i will give some thought to a way of getting triple carbs of some sort into your car, im very keen to try something like this again.
keep in touch
a7m

 

[2v XLE]

The 223@0.050" crow cam looks ok to me. Figures are

Crowcam 223@50 IN. 29/73 EX. 75/25 valve lift 0.448" l/c 114, rev range 2100-5500.

I'm a bit curious how it will sound with the 114 lobe centers. My current cam is 214@0.050" with 110 lobe centers it sounds good, with a bit of a lope, I don't want to smooth the idle out because i like the sound. A bit lopier then what i have would be even better.

I was also looking at a Wade cam

Wade 222@50 IN. 38/72 EX. 79/32 valve lift IN. 0.444 EX. 0.446 l/c 110, 2500-5800.

The Wade is a bit later on the intake, but opens a bit longer on the exhaust. Have been told that this cam will be a bit lumpier then the crow, but will miss out on a bit of the bottom end torque the crow will produce.

I basically want what the crow will produce, but the lump of the Wade. Its a bit of a toss up really, becuase the wade will give a bit more hp in the top end. Will the 114 lobe centers on the crow smooth the idle out?

 

[2v XLE]

OK, I've ruled out high revs and decided I basically want a low to midrange torque monster.

I went and saw Keith at wadecams in Oakleigh, told him what I was after and he suggested this cam:

222.5@0.050", IN. 32/68 EX. 72/28 valve lift 0.473" (1.54 r/r - standard gear), 108 l/c.

The profile he offered had 110 lobe centers, but the cam would make power to around 5500-5600 which is initially what i wanted, but I've now decided to go with 108 l/c to tighten the rev range and bring it back down to around 5000rpm.

Carb which i have just picked up is a holley 4bbl 570, and I'll be using one of the 4v CI intakes so i dont need to butcher an original 2v manifold.

A7M, I'm still looking into the idea of triples, but its a little way off. I dont know much about these carbs except about the amounts they can cost! The weber/dellorto carbs sound fairly similar, but how would triple su's compare in an engine build like mine?