Hot Rod Forum banner
1 - 20 of 25 Posts

·
Registered
Joined
·
19 Posts
Discussion Starter · #1 ·
I have a set of modified Vortec heads, with 292H comp cam the guides have been cut down so It can handle up to a 550 lift cam, and the heads also have been ported and polished, and screw in studs.
I wanted to know have any of you guys ever ran this cam before how did you like the performance out of it, and what are some of the downsides of running this cam. the motor is going in a 84 Z28 with 3.73.. if you could recommend any other cam that would work best with my head's what would you recommend?
the motor is at 10:1 compression and it's a 350 bored over .40.
all responses are highly appreciated
 

·
TAKE A KID TO A CAR SHOW
Joined
·
2,857 Posts
Ive been running 292s for many years its one of my favorite cams its from around 3000 rpm up is excellent! But below that you may not be happy, I recommend a 4000 stall convertor and hefty gears I run 4.56s it is excellent for a low tunnel ram intake Like the Wyand and 2 650s to 750s on a small block with 10-1 comp and 110 octane fuel! If your a sound type guy it has a very lumpy idle at street idle rpms. This cam I wouldn't recommend for a street driven grocery getter but for a weekend warrior and part time drag car its a great cam! I set my lifters (anti pump up at +.002 lash).

Have fun! Jester
 

·
WFO
Joined
·
5,030 Posts
I'd recommend short travel lifters. If you should want to 'zero lash' the lifters, or even decide to try running them w/lash like a solid:pain:, be sure to get lifters that have the internal C-clip type retainers (retainer on the left below), not the round wire type (center and right).



That said, unless you are going to swap out the rear gear and torque converter, use a smaller cam. Someone will be along w/recommendations for that, I'm pretty sure.

What is the rest of the combo- intake, carb, headers, etc.? And how are you going to be using this bad boy?
 

·
Banned
Joined
·
9,993 Posts
XE274 and NO BIGGER. Smaller would actually be a little better.

You can go with the 292H but you'll make less power and burn more fuel- it's a losing proposition all around.

the 401A3 by lunati is also a good cam to use if you want to use a solid flat tappet, I'd definitely go solid on this route.

If you can afford a roller cam it gets even better.
 

·
Registered
Joined
·
19 Posts
Discussion Starter · #6 ·
the car would be driven twice or 3 times a week., I have a Edlebrock RPM air gap intake I also have Shorty Hooker Headers which ball 1 5/8, and a 650 CFM Quick Fuel carburetors. I plan on getting a 3000 stall, are my rear end gears too small I was trying to avoid gears taller than 3.73
because the car may get on the highway a few times..
 

·
Registered
Joined
·
4,018 Posts
I love the 292H. really nice cam. works well with a 3000 stall and 4.11 gears. Pulls hard to 7000 rpms but makes max power around 6500.
 

·
TAKE A KID TO A CAR SHOW
Joined
·
2,857 Posts
the car would be driven twice or 3 times a week., I have a Edlebrock RPM air gap intake I also have Shorty Hooker Headers which ball 1 5/8, and a 650 CFM Quick Fuel carburetors. I plan on getting a 3000 stall, are my rear end gears too small I was trying to avoid gears taller than 3.73
because the car may get on the highway a few times..
You can tune final ratio with shorter tires! :thumbup: The 1 5/8 shortys may be a little small and kill the scavenging long tube tuned headers would be a much better choice if you budget allows it,
And 3000 stall and 373s should be fine with that intake if you advance the 292 when installed your power range will come in at a little lower rpm it may help with the 373s! and you will lose some of the erratic Idle characteristics (the rumpy sound LOL) It has a 106 center line! I run the 292s retarded! at "0" lash it pulls till close to 7000 rpm with +.002 lash it pulls closer to 7500 rpm with a light valve train and heavy springs! don't skimp on valve train components and get good recommended springs and push rods Stay away from summit brand! and get lifters like Cobalt recommended if your going to fool with different valve lashes at the track! NOT THE STREET:nono::nono: LOL:D

Jester
 

·
Banned
Joined
·
9,993 Posts
HOLY ****!!! Its a Christmas miracle- all three of us agree on something- though I figured F'bird would be partial to the 401A3 cam.
 

·
Registered
Joined
·
1,684 Posts
I checked a few out a few cams out on CamQuest6, comp cams simualator. First the 292H-2500-6500, .501/.501, 244/244 @ .050, [email protected] & [email protected] torq. XE284H-2300-6500, .507/.510, 240/246 @ .050, [email protected] & 388 torq. 280H-2000-6000, .480/.480, 230/230 @.050, [email protected] & [email protected] torq. EX274H-1800-6000, .490/.490, 230/236 @ .050, [email protected] & [email protected] 4000 torq. XE268H-1600-5000, .477/.480, 224/230 @ .050, [email protected] & [email protected] 3500 torq. Notice that the smaller cams make more torque than the larger cams. With the IVC closing on all of these cams the DCR is 7.6-8.4 which is good for pump gas. These numbers are based on a dual plane and 750 cfm carb. Pocket porting the heads gains around 40HP. Single plane intake and large tube headers can gain 10-15hp each.
 

·
Administrator
Joined
·
6,247 Posts
I'm with Jester and 454, running an older Herbert 292H in the bucket, 427 BB tunnel ram, 3k stall. Lumpy, yes, but well mannered when tuned right. Being light (1800 #'s) gears aren't an issue and it pulls through 7k, not something I do often... :pain:
 

·
WFO
Joined
·
5,030 Posts
I checked a few out a few cams out on CamQuest6, comp cams simualator. First the
292H-2500-6500, .501/.501, 244/244 @ .050, [email protected] & [email protected] torq.

XE284H-2300-6500, .507/.510, 240/246 @ .050, [email protected] & 388 torq.

280H-2000-6000, .480/.480, 230/230 @.050, [email protected] & [email protected] torq.

XE274H-1800-6000, .490/.490, 230/236 @ .050, [email protected] & [email protected] 4000 torq

XE268H-1600-5000, .477/.480, 224/230 @ .050, [email protected] & [email protected] 3500 torq

With the IVC closing on all of these cams the DCR is 7.6-8.4 which is good for pump gas. These numbers are based on a dual plane and 750 cfm carb. Pocket porting the heads gains around 40HP. Single plane intake and large tube headers can gain 10-15hp each.
Who's gonna be the first to say "But we don't race dyno sim programs!". But good job putting this together. Regardless of the actual numbers, what it shows best is the relationship between the different durations.

And judging by what I see, the XE268H ain't that bad, either. Especially w/the mild gears and stall. Comp's dyno sheet has it down for 342 HP @ 5000 RPM and 413 ft/lbs @ 3800 RPM using Dart S/R's and a 3310 Holley. Probably long tube headers too. Manifold Vacuum is 15.5" Hg @ 800 RPM & 17" Hg @ 1000 RPM w/ no load.

BTW, Comp also has a dyno sheet on the XE274H, it shows 369 HP @ 5900 RPM and 410 ft/lbs @ 3900 RPM using same parts as above. Manifold Vacuum: 11" Hg @ 800 RPM & 14" Hg @ 1000 RPM w/ no load. Get this one ground on a 108 LSA...

The rest of their cams w/dyno sheets are here.
 

·
Registered
Joined
·
4,018 Posts
My 2800 car (with me in it) ran trapped at 120mph in the 1/4 mile with a 292H, 200cc dart iron eagles heads, 10.5:1 350, full length headers, rpm intake, and a 3310 750 holley. 3.90 gear and T5 manual trans

That is 370 hp at the tires

beat the hell out of that engine for 10 years. cam finally when flat when they changed the oil formulation
 

·
TAKE A KID TO A CAR SHOW
Joined
·
2,857 Posts
F birds "Y" pipe is interesting, reminds of the Tri Y headers I dyno'ed the Tri Ys! The increase in hp and torq was quite a bit more then street headers and fell just short of tuned competition headers till they entered higher rpms! over 5500rs! I guess that works on the same principle for scavenging!

I never ran shorty's either.

Jester
 

·
TAKE A KID TO A CAR SHOW
Joined
·
2,857 Posts
PJ, when were the tri Ys popular? I think Jere made the 4 into1s starting 1964? just before my time...lol.
I saw the first in the early 60s, at Detroit drag way they called em 421s (4 into 2 into 1) I think they were made by Cheetah Or Black Jack! LOL

My dyno tests were in the the mid 80s! But they were really popular in the mid 70s and early 80s here! and are still produced! they were also used on a lot of Honda 750 racing motorcycles!

Jester
 

·
Banned
Joined
·
2,474 Posts
292:mwink:

your 84 z will be happy without a little low end..
unless oh course you've reworked the whole car..
the facory set up.. a weak v6 with iroc wide tires can turn them over.lol

the car will be faster on the street with a softer lower end, that'll get you moving, roasting tires=fun but not fast
 
1 - 20 of 25 Posts
Top