XR274R or 60231 for Steet 396 ?

3lks67 · Mar 28, 2008

By the way, thats for the imput on my deck Ht. question earlier this week.

I've decided to go with a solid roller for my 396 build-up, mainly because I have access to a good set of comp 866-16 lifters. (constant oil to bearing). Both cams seem to be street friendly, as comps description says" easy on parts,very reliable" recommended springs are 148# on seat, 465# open. Voodoo recommends 235# on seat, 509# open.

Would either cam be suitable for street use, considering the lifters I have?

My combo
396 +.030, Nodular crank, Thumb rods, 2240 pistons, 9.75/1
Balanced rotating assy
215 heads, Stock size Street-Flo valves, some bowl blending
RPM Air-Gap, Holley 750 VS 4160
TH-350, 10" TCI Streetfighter- expected stall for BBC 3400-3600
12 Bolt, Eaton, 3.73

The only thing I may change is the converter ( which I have). It seems the roller cams make good torque at lower RPM, and am concerned with my cruise RPM vs Stall speed.

Looking for any advice, thanks

Steve

badrad · Mar 28, 2008

Look at Chet Herberts 2002-H. It's hybrid cam 272 seat to seat/.632 lift/243 @.050. Should run well with your combo.

3lks67 · Mar 28, 2008

Where can I find some info or a supplier for that cam?

69-CHVL · Mar 28, 2008

The XR274 is a powerful cam. Even better, try our own Chris Straub who frequents here. He can spec you a cam that has the appropriate lobes to "fill" and "expel" your cylinders properly for max power.

badrad · Mar 28, 2008

The phone number is on the webpage but the online catalog doesn't work. When I called about mine the guy new all about the cam, I think it is one of the more popular. I planned on using mine in a 427 but might be a bit small, maybe throw it in the 402 instead. Range is listed as 2500-6500, the reason I like this one is the short seat to seat to build cylinder pressure with the streetable compression.

3lks67 · Mar 29, 2008

I'd be very interested in advice from Chris Straub. I thought there might be some opinions from those who run solid rollers in their 396/402 with a basiclly stock bottom end and closed chambered heads. I have the CompQuest program for their cam selections, and the gains to go to a solid roller are substantial. Although this a street car, its not a daily driver.

3lks67 · Sep 28, 2008

Thought I'd reopen this tread, and hopefully get a recommendation from UDHarold on a cam choice. My engine is back from the machine shop and ready to assemble. Only changes are I have the Crower HIPPO lifters.

Is anyone running a SR on a combo similar to mine?

Thanks, Steve

bowtie468 · Sep 28, 2008

I am useing the 274 cam in my 468, I have rec port heads and two 600 holleys on top. I like the cam but I would use a 2500 stall convertor min.I switched my convertor to a 3000 stall and the car is much more drivable,With all the hoo-ha over the solid roller longevity or lack of, know that this setup is a manitance deal, you must keep an eye on your valvetrain ,If you don't like to be adjusting valves often or at least looking under the valve covers often ,and if this car won't be at the track too much I would look at a Hyd roller as I am currently lookin to put a hyd roller in my car as mine will never see the track, one other thing if you do go with the 274r get the billitt core if available not the cast core, I have 2"super comps and 3" pipe with "h" connector into flowmaster delta 40's, the idle is impressive but at 1200 rpm I am only getting 10" of vacuum, I had to use the aux. vacuum canister and at that, at a full stop in gear my power breaks are very suspect.I hope that this helps

3lks67 · Sep 28, 2008

bowtie468 said:
I am useing the 274 cam in my 468, I have rec port heads and two 600 holleys on top. I like the cam but I would use a 2500 stall convertor min.I switched my convertor to a 3000 stall and the car is much more drivable,With all the hoo-ha over the solid roller longevity or lack of, know that this setup is a manitance deal, you must keep an eye on your valvetrain ,If you don't like to be adjusting valves often or at least looking under the valve covers often ,and if this car won't be at the track too much I would look at a Hyd roller as I am currently lookin to put a hyd roller in my car as mine will never see the track, one other thing if you do go with the 274r get the billitt core if available not the cast core, I have 2"super comps and 3" pipe with "h" connector into flowmaster delta 40's, the idle is impressive but at 1200 rpm I am only getting 10" of vacuum, I had to use the aux. vacuum canister and at that, at a full stop in gear my power breaks are very suspect.I hope that this helps

Checking valvetrain is no problem for me, I crew on a dirt modified, and do it occasionally. I'm running manual disc, so vacuum isn't an issue. As you are, I see some members here running these cams, but on bigger inch motors. Just trying to see how they would perform on a smaller big block.
Steve

3lks67 · Sep 30, 2008

UDHarold, Could you give me your thoughts on a cam choice?
Steve

Wolfplace · Sep 30, 2008

3lks67 said:
UDHarold, Could you give me your thoughts on a cam choice?
Steve

=
Steve
You went right by Joe's comment about that Comp cam
It is ground on a cast core & I hate these things
If you go with this cam have it custom done or a Billet core with the cast gear option

All of Harold's cams are going to be on the Billet so no problems here
This goes for Chris too, none of us us those cast cores.

67Super Sport · Sep 30, 2008

Here is my old 396 combo with that same cam. Mine was ground on a billet core (cast dist gear option) with a 108 LSA after having issues with the cast core shelf grind. The 108 LSA was no quicker in the 1/8th than the 110 LSA. This cam would be a perfect fit for your combo. Nice idle and pulls like a motha.

67 Chevelle SS
Race Weight w/ Driver ~ 3600 lbs

Engine
402 BBC
L88 forged crank
TRW L2240NF30 Forged Pistons (9.75:1)
Eagle I-Beam rods
GM iron oval port heads (Casting # 3904390) with Manley valves (2.06 Intake/1.72 Exhaust) Bowl Blending, and 3-angle valve job
Crane Gold roller rockers
Competition Cams Xtreme solid roller cam XR274R(236/242 @.050, .639/.646 lift, 108 LSA)
Crane roller lifters
Stock L88 pushrods
Edelbrock RPM Performer intake
Holley HP750 Double Pumper Carb

Exhaust
Hedman 1.75 in. primary headers with Flowmaster Scavenger collectors. 3 inch pipes with 3 in. Jegs H-pipe into 3 in. bullets dumping right before the rear axle housing.

Rear end
12 Bolt with 4.56 gears
Moser 30 spline C-clip eliminator race axles

Trans
TH400 with full reverse manual valve body
ATI 8 in. converter flashes to 5000

Ignition
Stock rebuilt HEI distributer
MSD 6AL box
MSD Blaster coil
Holley plug wires

Performance

Best ET to date @ Piedmont Dragway:

60Ft. -1.50
1/8th Mile -7.09
MPH -96

3lks67 · Sep 30, 2008

I will definately go with a cam on a billet core. My make concern , with so much being said about solid roller lifter failure, is that my choice of cams will give the best performance without being too hard on the lifters. Are these cams indeed steet friendly?, or for a 396 is there a better grind to go with. Will the rpm range differ by engine size?
Thanks, Steve

dacaman12 · Sep 30, 2008

Wolfplace said:
=
Steve
You went right by Joe's comment about that Comp cam
It is ground on a cast core & I hate these things
If you go with this cam have it custom done or a Billet core with the cast gear option

All of Harold's cams are going to be on the Billet so no problems here
This goes for Chris too, none of us us those cast cores.

This is the reason for the large difference in recommended spring pressures.

FWIW, the voodoo solid rollers have the same closing velocities that Harold has used for street solid, and rollers, for about 30years. YES, they're street freindly.:thumbsup:

SWHEATON · Sep 30, 2008

The rpm range for the same given cam will have different rpm range, for ex,in a 396-402 & maybe 427 it will be higher before power drops off then in a larger 454-489-496-502 motor .

Scott

3lks67 · Oct 1, 2008

Thanks Scott,
This is the impression I have. With that said, most manufacturers list a desired RPM range, but not a cubic inch or stroke for the given range. With my combo I would like to see max RPM of about 6200-6300,... I think?. I submitted a cam recommendation form to Lunati and they recommend the 60232, RPM range 2600-6800. Would my 396 be in the 6800 range? I dont want to over cam this motor, and hoping for good performance in mid range.

Steve

SWHEATON · Oct 1, 2008

The 396 being the smaller of the bbc's would definately rpm closer to the "stated" top end of the rpm range for that cam,thats for sure.

But that also depends on proper valve springs, fuel system,intake ,carb,ign system,headers-xhaust,etc to collectively help achieve top end rpm for a given cam too.

Scott

67Super Sport · Oct 1, 2008

The comp XR274R would go 6300 maybe 6400 in my 396 and then it was done. The same cam in my 460 with much better flowing heads, more compression, lighter rotating assembly, will easily go 6400 and is still pulling hard. Guess it all depends on the combination but this cam RPM's better with my 460. In the 396 it is right in the RPM range you are looking for.

As far as your question as to its streetability... I have no idea. I am strictly a bracket racer. Been running Crane std. roller lifters ever since I went roller 6 years ago. 1st set went ~900 passes (still sitting in attic in case I need a spare), 2nd set went 1 season (~300 passes) and was sold for the new set in the 460. But I have never fooled with a solid roller on the street.

XR274R or 60231 for Steet 396 ?

3lks67

badrad

3lks67

69-CHVL

badrad

3lks67

3lks67

bowtie468

3lks67

3lks67

Wolfplace

67Super Sport

3lks67

dacaman12

SWHEATON

3lks67

SWHEATON

67Super Sport

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