496 build cam recommendation

[Shaffy]

Im building a 496 for a guy using some 291 heads that came with the engine he bought, it is a 427 "CE" block that was used in a super stocker back in the day. This is a nothing fancy super build by any means, he wants to use the parts it came with. just looking to build a nice torque monster that sounds good and will make him smile when it idles and when he stomps on it. its already set up for 10.5:1.

Its undecided yet what its going in, some options are a 70 vette with a 4 spd trans, another option would be a truck, its most likely going to be a manual trans set up in a heavy vehicle.

I want to go roller, leaning toward hyd because i dont want him to worry about running lash, but i cant seem to find a decent hyd roller grind with around .600ish lift. Should i go solid roller?

Do any of you guys have recommendations?

[ClassicComp]

GM sells a decent hyd roller for that stuff.
Maybe it’s a 502/502 hp cam.

[vortecpro]

Im building a 496 for a guy using some 291 heads that came with the engine he bought, it is a 427 "CE" block that was used in a super stocker back in the day. This is a nothing fancy super build by any means, he wants to use the parts it came with. just looking to build a nice torque monster that sounds good and will make him smile when it idles and when he stomps on it. its already set up for 10.5:1.

Its undecided yet what its going in, some options are a 70 vette with a 4 spd trans, another option would be a truck, its most likely going to be a manual trans set up in a heavy vehicle.

I want to go roller, leaning toward hyd because i dont want him to worry about running lash, but i cant seem to find a decent hyd roller grind with around .600ish lift. Should i go solid roller?

Do any of you guys have recommendations?

A 291 head doesn't start flowing until .550 lift, I would definitely go solid roller around .650 net lift.

[Shaffy]

exactly, that why i wanted 600ish lift so we can try to get the most out of the 291's. i want a mild grind with decent lift that isnt going to be hard on parts and/or require him to have to run lash... if i do go solid, i dont think it will be the end of the world, but he isnt a real hands on guy, so i want to keep it as "turn key" as possible... make sense?

[CamKing]

It depends on what RPM you want to make peak HP

5,600rpm
Cam# BBC, HR73353-75348-110
233/240 @.050"
.600"/.591" Valve Lift
110 LSA

6,000rpm
Cam# BBC, HR75375-78360-111
241/251 @.050"
.637"/.612" Valve Lift
111 LSA

6,400rpm
Cam# BBC, HR78390-80390-112
253/260 @.050"
.663"/.663" Valve Lift
112 LSA

[Racing68]

Not sure what your heads flow but I did a 505 for myself using promaxx 317 heads 10.4:1, Bullet hyd-roller 240-250 .650-.625 and made 709 HP 680 TQ.

[Shaffy]

It depends on what RPM you want to make peak HP

5,600rpm
Cam# BBC, HR73353-75348-110
233/240 @.050"
.600"/.591" Valve Lift
110 LSA

6,000rpm
Cam# BBC, HR75375-78360-111
241/251 @.050"
.637"/.612" Valve Lift
111 LSA

6,400rpm
Cam# BBC, HR78390-80390-112
253/260 @.050"
.663"/.663" Valve Lift
112 LSA

Hey Mike, what do you think the idle characteristics will be like with your 6000 rpm grind? i see its 111, will it idle nicely? I also like the smaller one, i dont want to get too aggressive.. I have a feeling there will be enough power with the 2 smaller grinds, i dont see this guy really winding this motor out once he hits it... but who knows. i do want it to idle fairly decent.. that is a goal.

[CamKing]

The first 2 will idle smooth in a 496.

[F-BIRD'88]

For a street friendly solid street roller the Comp Extreme energy roller cams work great in big blocks.
Buy the complete "K" Kit.
Xr274R10, XR280R-10 ,XR286R10, XR292R-10
236/242 242/248 248/254 254/260
All 110LSA (106/114) The largest, VTP clearance must be checked.

Custom grind variations of these XR rollers are a phone call away.
You can lash these cold a bit tighter (.012"/.014") than cam card . Easy lash maintenance with these XR solid rollers.
Use a Edelbrock Performer RPM dual plane or a Vic JR
The milder 2 have a performance choppy idle. The 2bigger have a racy (er) choppy idle.
The Magnum CB288AR-10 (246/246) is also a good one for this.
Scorpion 1.7:1 roller rocker arms work great on this
A origional 427/435 HP 3x2 TRI-POWER induction would be sick on the Vette.

[F-BIRD'88]

Instruct the customer on the easy goof proof "I-C -- E-O" valve lash method using the slightly tighter "COLD Lash" lash spec.
None of the disappointments of hyd rollers on BBC's.
These XR street rollers hold the lash for a long time.

[bob460]

What about a comp cams extreme marine hydraulic roller high lift cam works well with heavy valves in big blocks.......615 lift

[Ron Miller]

Not sure what your heads flow but I did a 505 for myself using promaxx 317 heads 10.4:1, Bullet hyd-roller 240-250 .650-.625 and made 709 HP 680 TQ.

Nice combo above. Were the heads out of the box or were they modified?

Thanks,

[Racing68]

Cut the seats to angles I normally use and cut back the head bolt hump on the divider, that's it. They flowed 402 @.700 on the good port. I was very surprised at how good those heads looked and performed for the price, usually cheaper heads don't flow anywhere near advertised and look like crap.

[FC-Pilot]

Cut the seats to angles I normally use and cut back the head bolt hump on the divider, that's it. They flowed 402 @.700 on the good port. I was very surprised at how good those heads looked and performed for the price, usually cheaper heads don't flow anywhere near advertised and look like crap.

Those are stout flow numbers. What were your MCA and what do you think total volume was?

Paul

[Racing68]

Unfortunately I never measured, basically opened box saw the seats were too wide for my taste and recut them, then knocked the bolt hump out blended the seats and threw one on the flow bench.