BBC 427 roller cam
 

looking for input for my vette, any suggestions on a roller cam ? Ive talked to Lunati and they suggested the 20110710 but dont think its got enough rpm's 262/270 I .550 E.550 112 split 1400-5400 rpm, I still need enough vacuum for the head light system, no power brakes tho

TIA

Speedy, are your intentions to do a close to stock engine rebuild with a somewhat stock roller profile? The stock cams were pretty tame, and yes you need good vacuum.
Try Bullet Cams see what they say/recommend. I rebuilf my 66 427/390 vette a few years back went with a Crain retro cam flat tappet just because. But JMO maybe keep duration down to the 230-236 range 520ish lift

I want something a little more than stock, I talked to Bullet, he was in the 240-248 ?

You may want to post advertised and .050 numbers to be able to compare. What compression ratio are you going to run, what heads, what intake, what exhaust ? automatic, manual, gear ratio ? would all help

The engine will have all stock components ,close ratio M-21 4 speed, 373 gear, 10.25 compression, 2 1/2 exhaust..no power brakes

So are you thinking solid or hydraulic roller ?

2 or 4 bolt mains, cast or forged internals, oval, rectangle or peanut heads ? are you going to run stamped or roller rockers ?

How about hiding something like this:

https://cimg7.ibsrv.net/gimg/www.off...65d2dc3919.jpg

its a 2 bolt block, I plan on running the stamped steel roller tip rockers to fit under the OE valve covers, Its an all stock rotating assembly with new K Black forged pistons, the heads are stock oval port closed chamber heads..............Im not trying to build a TF engine......

Is that a flux capacitor......lol

The stock heads won't take much lift without hitting the guides, unless you machine them. 2 bolt, cast crank and rods, guessing you'll want to keep the RPM down, maybe 228/ 236 range at .050. Just a guess

The new guides have been machined for a roller higher lift cam, Id like to spin it to 5800 to 6k if I want

Maybe go with a similar grind to the 427/425HP. lift on stock 390 was 461/ 480 425HP lift was 519/519 Duration on stock 425HP was "around" 232/236 but keep in mind it was a solid cam.

i think the hp500 efi cam would be a good choice,230/236 at .050.598/610 lift 114 lsa.crane cams 169621.with the factory heads and 10.25 to 1 cr i think it will make you smile.i might have one on the shelf,if interested il check.

is that a step nose gen 6 ? or no

The 110 lsa may be better for the street

yes step nose gen6.

agree,either one would work.

Ive not built one of these in years, can the step nose cam fit ? I see in the front of the block that it looks like its machined for the retainer ring but not sure

ttt

If it’s machined for it I would think it could be drilled and tapped for the thrust plate. Just not certain what timing set you’ll need.

Btw just for a comparison on your cam duration my 496’s had 244/248 duration. Installed 4 deg advanced peaked at 5,800 with hyd rollers and at 6,000 with solids. 4.250 stroke.

Something similar to the 731 cam I’d think.would be a good choice in a 427 to achieve what you want.

whats the lift ?

Lift on the 731 is 587/610. Duration 226/234. Would be a healthy cam in a 427. I didn’t catch though are you wanting to stay hyd flat tappet?

Are your heads the 290’s? If so they like 10-12 deg split in duration as many gm heads do.

The 731 should put you very close to peak hp at 6k.

Another option. Good call Mike, somehow I missed your post.

hydro roller, thats the reason for the thread, my heads are 3931063 1969-71 427 2.06 1.72 Closed 100.9 heads

Here;s a Comp cam I found, thoughts.............566/566 Lift 242/248 Duration 112 Lobe Sep.

Better for sure! those stock closed chamber heads and manifold will restrict (to a point) may not benefit much from a cam that is larger the the above cam.

Im not trying to make a bunch more power, the choice of a hydro roller is for ease on the valve train, when engines sit for a long period of time between starts

I agree, sounds like a good plan!

another Com cam, 110 LS
Intake Valve Lift (in.) 0.540
Exhaust Valve Lift (in.) 0.56
Int. Duration @ .050 in. (Deg) 242
Exh. Duration @ .050 in. (Deg) 248
RPM Range 2800-6100
Int. Duration Advertised (Deg) 294
Exh. Duration Advertised (Deg) 300

I would think that RPM range is probably in a longer stroke 454, also an 8 degree split may be better.

Just a thought, Lunati Retro-Fit Hydraulic Roller Cam. High performance street cam. Likes upgraded intake, carb and exhaust. Needs 2800 RPM stall converter in most cases. Requires 9.5:1 compression for maximum performance.; Advertised Duration (Int/Exh): 282/290; Duration @ .050 (Int/Exh): 231/239; Gross Valve Lift (Int/Exh): .600/.600; LSA/ICL: 110/106; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 2200-5800; Includes: Cam Only

Is there a part # for this cam 20110712 ?

Lunati, SKU
20010712

show it for a GEN 6

I ran the hydraulic flat tappet version of the 231/239 110 lsa in a mild 454, nice idle, pulled right to 5400, shorter stroke 427 should go to 5800 easy.

Sorry, SKU
20110712

yes, i put gen 6 step nose cams in mark 4 blocks all the time.you use a gen 6 timing chain&gears and a gm cam retaining plate.i have the gm part number for the plate&bolts in the shop and can list them tomorrow.

Thanks Mike