I want to be able to run my A/C, PS/PB fine, and was wondering if these cam (hydraulic roller) specs are ok?

218/224 @ .50, .528/.536 lift, 106 lobe sep.

 

Your topic should read "Too much duration and/or overlap" not too much lift. Lift has very little to nothing to do with idle quality.

Just an FYI.

 

I just rebuilt my 350 in my 71 442 convertible clone using a Comp Xe284H thing sounds and runs great, idles at 900 with AC on in gear. Has PS/PB but I am using a vaccum reservior can to store vaccum for the brakes. Stall is a 2800 Hughes with TH350/3.73 Eaton posi. I have W-31 heads angle milled to 60cc and using cometic head gaskets with .020 thickness compressed. Pistons arent anything special they are 21cc dished units from Sealed Power. Compression is calculated at 9.2:1 with the .040 bore. This car will give my 06 Z51 6spd Vette a run for its money up to 145.

Basic Operating RPM Range2,300-6,500Intake Duration at 050 inch Lift240Exhaust Duration at 050 inch Lift246Duration at 050 inch Lift240 int./246 exh.Advertised Intake Duration284Advertised Exhaust Duration296Advertised Duration284 int./296 exh.Intake Valve Lift with Factory Rocker Arm Ratio0.541 in.Exhaust Valve Lift with Factory Rocker Arm Ratio0.544 in.Valve Lift with Factory Rocker Arm Ratio0.541 int./0.544 exh.Lobe Separation (degrees)110Grind NumberOL XE284H-10

 

As cutlassefi said. Also lift over about .5" means be careful that the valve springs don't coil bind, retainers don't hit vavle seals, and rockers don't hit the ends of their slots on the stands. Beyond that, the lobe centers are too tight with that much duration to be optimal for a 350 with AC.

 

Thx. Seems like everyone has their own opinions on the best cam.

I placed an order recently for a hyd roller with those specs from a well known co... but the cores are out of stock at present.

 

Also, would 2.000" int. valves benefit (assuming these cam specs are used) or would it be a waste of time?

I am already set on stock int/exh manifolds....9.5:1 CR, 3.42 posi, stock Q-JET (tweaked as need), and will likely have my blown TH350 rebuilt.

 

What does it idle at in neutral?
Are you saying you 71 Olds does 145? Hmmmm.

 

What are you going to do if he says the only cores available are 4-7 swap?

I think it's a little on the tight side as well.

 

I asked him SEVERAL times... so if I get a 4/7... I am going to go over there and and and send him a pizza he didn't order or something.

 

I am curious if these 'cores' are coming from the same source. Maybe I can order directly from Mr. **** in China?

 

IMO if your trying to order a roller set up thru someone other than a Olds specific dealer your stuffs going to be wrong........Pick a vendor amd have him help you get your setup right,Otherwise there will just be a another my engine has no power thread...........

IMO again a nice bracket master cam w/matcing springs are enough for a nice mild street build with good results.......mine went 13.30s in a 3900lb car.......

 

That is exactly who I ordered from.

Actually, I went to Mark above first, but don't want a 4-7.

 

The olds is out of gear past 140-145 ish... has 3.73 in the rear and thats turning over 6400 rpm with 28.05 dia tire. Regardless my suspension is all built out, giant Addco swaybars, AGR steering box, shocks, springs etc. Ol girl is rock solid in the triples but I seldom push it over 70. My idle is 850-900 in or out of gear, I have a 2800 hughes 10" stall convertor so not much load on her until the electric fans kick on and start dragging the 100amp alt down about 100 or so. AC pulls it down to 750 in gear. This cam has a great sound and feel makes a boat load of midrange tq with the 60cc #5 W-31 heads and pulls strong to 6k. The heads have mild porting, large valves and angle milled to 60.4cc, screw in studs, guide plates, roller rockers. MSD Digital 6 with Blueprint HEI 34 degrees all in by 2450, vac advance disconnected and one heavy and one light spring in the mechanical adv. With the loose convertor and vaccum reserve can it doesnt bug me as I like cammed up motors and when they are setup right they run well. If your looking for a smooth idle this IS NOT the cam for you. I have video of it... not certain how to post a vid here??

 

Which vendor??

 

BTR Performance. Bill Trovato picked the specs.

 

Yes, using the big block valves will help with your set up...and would be even better w/ port work done.

 

Thx. I contacted 'thevalveguy' on eBay, but he seems pretty busy at the moment. His bronze guides are over $180 cheaper than BTR's. Hopefully, they are the same or at least decent quality.

I can still use my hardened seats yes?

 

Also, I'm assuming you will use the 1.625 big block exhaust valves as well to go along w/ the 2 inch intake valves. Olds motors need all the help they can get with respect to exhaust.

 

Yes. I ordered the 2.000" int. and 1.625" exh. S/S valves, same as the W31.

Also debating on driving out to BTR or not to get my heads done, or trust my local machine shop.