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Old 11-09-2012, 06:25 PM
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Worthwhile upgrade?

Went to pick up cam after work today, Dad building the young lads motor with him for an 85 monte and they changed direction to a Turbo motor midway through the build, I went to buy his new XE284 cam, but it turns out it a 292H, with lifters in box brand new, they offered it to me for 150$ as it wasn't the cam the lad thought it was. I told them I would sleep on it and call tommorow....I'm already hearing the 284 was missmatched based on the assumption my little 305 heads don't flow....but it seems the same rules for set up will apply, locked timing etc etc....so is it worth the cash and with 411's and. 3000 stall will it be significantly stronger then the stock converter and wee little lunati I have now? Have to let him know by lunch time tommorow so any input would be appreciated....

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Old 11-09-2012, 06:55 PM
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I'm not entirely clear on what you are trying to say. Are you asking if you should use the 292H cam or keep what you have?

stock 305 heads can't flow enough to support even a 268xe cam so I wouldn't even consider the 292H, but people have made mismatched engines run okay in the past. If I were you I'd look at a MUCH smaller cam- around 215 duration at .050" if you're running stock 305 heads.
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Old 11-09-2012, 06:56 PM
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Quote:
Originally Posted by hcompton View Post
Is it for a 305 a 292h can be a really big cam on the small bore engines. It may also have way too much overlap for most turbo apps.

I love big cams but for small engine its not going to make any power under 3k rpm. Then it will only come alive long enough to run out of flow.

Why 58 cc on a turbo motor. A 2.02 valve head with large chambers would be better. You can always turn up the boost its hard to turn down the compression.

Race car/street car?
I don't think a 2.02" valve head will fit on a 305 block bore. I think a 1.94" might be the largest it will take without notching the block's bore.
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Old 11-09-2012, 07:28 PM
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Sorry for the confusion, 77vette, 350 with stock flattops, heavily ported 416 casting 305 heads, 194/150, performer rpm, 750 dp, 3000 stall, 411 gear...currently has a small lunati 214/224 , 443/465
Heads were ported using any and everything I could find on here from f-bird and he knows his stuff very well. The motor pulls very hard to 6000 as it sits currently. But I will be installing the converter in the spring and wanted more cam at the same time. The price seems really good for the 292 but I know the heads, even worked, aernt ideal, but is it still going to be a large improvement that's worth doing?
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Old 11-09-2012, 07:30 PM
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And im getting the cam from a friend who purchased it, then decided against his n/a plan and is going Turbo, so he is selling the 292h new in its box....
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Old 11-09-2012, 07:33 PM
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Quote:
Originally Posted by hcompton View Post
Yes and no. But if its a 305 your head choice is pretty limited. He didnt say. I was thinking it was for compression. But i guess 85 monte would have 305.
Guess I didn't see that, just saw you mention a 305 and 2.02" valves, and didn't want people to think they might go together.
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Old 11-09-2012, 07:33 PM
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I just can't see using a cam with that much overlap on a budget turbo build. You'd be better off with the stocker.
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Old 11-09-2012, 07:35 PM
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That lunati may be the best choice. What's the lsa?
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Old 11-09-2012, 07:52 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
The Xe284H-10 is a better cam for your purpose. As far as being a good match to your combo stop
listening to people who no nothing about cams or ported 305 heads.
Don't ask people on the internet how much power you will make. They don;t know.
That what they make dynos and race tracks for.

The 292H magnum is not a bad cam. but....Id rather see you use a better solid lifter cam if you want
to go that big on the cam. It will work a lot better. Don;t be intimidated by street solid lifter cams.
They are not hard ro deal with at all.
Your friend is not the only guy with a cam for sale. You can buy a new cam for $150.
In a hyd the XE284H-10 would have been a good choice.
Yes your ported big valve 305 heads will work very well with it . If you did a decent job on porting them they actually flow pretty good. The only way to know how thye turned out os to run it down the track, stick it on a dyno or flow test the cylinder heads.

You are on your way to a good combo for the street for your vette. Don;t fuggg it all up now.
A Isky Z-27 cam would work very well. #201027. Another cam I like even better for this combo is the Lunati 401A3LUN cam. A nice street solid cam that will run nicer than the comp 292H. You will like it better overall.
good with your ported heads, good wiht the 3/4 shorty headers good with the 3000 stall and 4.11's.



The comp 292H needs a higher stall converter. 3500++.

Thats what I would do if not the Comp XE284H-10 cam. The comp Xe284H-10 cam is the biggest I would go with the 3000 stall converter.

So a hydraulic cam with 244 duration is in the same ballpark as a solid cam with 238 duration? yea right. A comparable hydraulic cam would have about 225 duration which is used with fully ported 305 heads would actually be about right.

So yes, the 401A3LUN cam would be a pretty good match (if the heads are ported)- the 292H cam isn't even close.

BTW, I'm sure F-bird knows this, but for those that don't you can't compare hydraulic and solid cams directly at 0.050" for the fact that solid cams run lash, for your typical .020" lash you need to subtract around 12 degrees to get an equal hydraulic duration- for more lash you subtract more duration for less lash you subtract less.
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Old 11-09-2012, 07:53 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
The Xe284H-10 is a better cam for your purpose. As far as being a good match to your combo stop
listening to people who no nothing about cams or ported 305 heads.
Don't ask people on the internet how much power you will make. They don;t know.
That what they make dynos and race tracks for.

The 292H magnum is not a bad cam. but....Id rather see you use a better solid lifter cam if you want
to go that big on the cam. It will work a lot better. Don;t be intimidated by street solid lifter cams.
They are not hard ro deal with at all.
Your friend is not the only guy with a cam for sale. You can buy a new cam for $150.
In a hyd the XE284H-10 would have been a good choice.
Yes your ported big valve 305 heads will work very well with it . If you did a decent job on porting them they actually flow pretty good. The only way to know how thye turned out os to run it down the track, stick it on a dyno or flow test the cylinder heads.

You are on your way to a good combo for the street for your vette. Don;t fuggg it all up now.
A Isky Z-27 cam would work very well. #201027. Another cam I like even better for this combo is the Lunati 401A3LUN cam. A nice street solid cam that will run nicer than the comp 292H. You will like it better overall.
good with your ported heads, good wiht the 3/4 shorty headers good with the 3000 stall and 4.11's.



The comp 292H needs a higher stall converter. 3500++.

Thats what I would do if not the Comp XE284H-10 cam. The comp Xe284H-10 cam is the biggest I would go with the 3000 stall converter.

Cam Spec Card :: Lunati Power
272-282 238-248 @.050" .485" .503" 112LSA .020" lash. use a lunati 73943 valve spring.
(the comp 981's will work with this cam if shimed correctly. Ya this matters.)
OK, well you haven't steered me wrong yet so far.....sounds like in this case I should hang on to my cash and look at a better option....think I should start reading up on solid lifter cams......can I use stock length pushrods, stock style long slot rockers...etc etc...
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Old 11-09-2012, 10:03 PM
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Well I think due to the budget theme, and lack of knowledge or experience with anything other then hft cams, I will tell the young lad I'm not interested in the 292 but will likely order up the XE284 you had suggested earlier.....for simplicity's sake and cost effectiveness....I picked up a running 350 from a 70's truck this week for pennies, it needs to be rebuilt so i will likely see how far I can take the motor in the car now, including the new cam and maybe some gas in the spring, and start putting together a "real" motor for when this one goes boom.....this way its a slow build when money allows it and keeps the wife happy.....and I'm having way too much fun with the junk I have now for so little cash invested that i can justify a shiny new cam......
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Old 11-10-2012, 06:33 AM
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Quote:
Originally Posted by F-BIRD'88 View Post
Thats too bad you are wimping out on the Lunati solid cam.
What is the big problem with this?
All the high performance corvettes had a solid lifter cam
Like the 1970-71 LT-1. This lunati cam is very similar to that.
Its a street cam designed for the street. These cams outperform hyd cams.
I bet this solid cam will run quieter at idle than the comp XE284H-10

Set the lash once twice a year. real easy. What knowledge do you need. Set the lash , shut the hood and drive it.
You don;t need to touch it for 6000 to 10000 miles.. Cold lash check takes 30 minutes to do, once or twice a year.
No other knowledge is needed. Mpre power , more rpm, what's not to like.

"EO IC"

you set the intake valve when the exhaust valve just starts to open... You set the exhaust valve when the intake valve just closes (back on seat)... you set the lash cold (easy) a bit tighter than the hot lash spec (hot lash is a pain and not nessessary) .004" ot .006" tighter is just right.
This all you need to know. repeat after me "EO IC"

You don't need to build another engine.
This is a real engine.

this lunati cam will work with your 981 springs ( correctly shimeed.
The comp xe284 needs a better spring.

There is no reason why this motor will come unglued. It will out live you.
You are getting all off on a tangent of building based on some emotional fear.
Fear of a solid lifter cam, fear the motor will come unglued.

Ya the 292H would not be your best bet for this one. The Lunati is....

Assuming you did a decent job on your heads,,, this is a easy solid 12 second ET all street performer
that will serve you well for many many years.

( An you will be all set up for a 150HP nitrous system that will rule the streets in Ottawa for
peanuts.,,,, Well... as long as I don't show up there LOL)
Lmao.....
Its not fear, I'm not afraid of breaking anything, my junk gets abused and driven like it owes me money....this is more of a cost situation....what are solidlifters and cam worth etc etc...I have to admit, valvetrain sounds are cool, when there supposed to be therelol....I just have no idea what lifters, cost, etc etc.....its more ignorance then fear....
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Old 11-10-2012, 07:19 AM
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Lmao.....
Its not fear, I'm not afraid of breaking anything, my junk gets abused and driven like it owes me money....this is more of a cost situation....what are solidlifters and cam worth etc etc...I have to admit, valvetrain sounds are cool, when there supposed to be therelol....I just have no idea what lifters, cost, etc etc.....its more ignorance then fear....
That Lunati cam will be a LOT better in your application than the 284XE. the 284XE is still TOO BIG.

As for cost, there usually isn't any more to go solid rather than hdraulic- BUT if you can afford the nicer face oiling lifters they have been proven to help durability. They're about $40 more i think.
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Old 11-10-2012, 07:27 AM
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If this is primarily a street driven vehicle that isn't street or track raced for money, you will kick yourself every time you drive it w/almost all of the cams mentioned on this thread. The cam in it now is just a little smaller than what will make an outstanding ride for everything except the 1/2 of 1% of the time that it's at WOT all the way through the gears.

You said yourself it runs good to 6K rpm, so what is it you hope to gain by going w/a cam several magnitudes more radical than what is in it now? Because I can tell you from experience that an over cammed engine is a real turd on the street. Unless you are taking it to the track this is a real waste.

I see this all too often here. There are max acceleration combos (high compression, big lumpy cams, loose torque converters, low rear gears) that when driven on the street- where there's no traction and LE to contend with- are just no fun other than the fender rattling idle.

Then there are all around combos that have good torque below 4K rpm and do not require the other less street friendly parts. You are heading towards a max acceleration combo- and for the vast majority of the time and for the vast majority of the drivers out there, this will not be any fun at all on a regular basis driven on the street. Just being the devil's advocate here, giving a bit of a reality check. If you're fine w/the downsides, then go for it and good luck. And save up for a decent set of heads. At least then the cam can give you what it really has.
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Old 11-10-2012, 07:28 AM
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I like that Isky, I also like the numbers on this
Howards Cams Mechanical Flat Tappet Camshaft and Lifter Kits CL11100208DL - SummitRacing.com
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