[Nyairguard]

Hi I have a orig 350ho and I benched the orig engine and had a 400ho engine built I am changing a couple of comp lifters for a quieter set anyway currently an 068 cam and wondering if its worth it to upgrade the cam got 3 on my list
crower 60916, 60242 or summit 2802
406 ci
4 speed
3.36 rear
10.06 compression
long tube headers
x pipe exhaust
12 int. 21 on dist 10 vac
750 street demon
roller 1.5 rockers
adjustable valve train
d port heads
16 inch vac @ idle
power brakes
76 cc heads
forged pistons

had 1.65 rockers on but the so called pontiac builder never clearenced for the pushrods

[pastry_chef]

Heads are unported?
Summit 2802 from your list.

[Nyairguard]

Order came in from advance, I bought sealed power ht-951 .. made in China and smelled like harbor freight. Bringing them back today and look for a USA set..

[Nyairguard]

yes unported, i like the sound clips of the 2802 what is the hp increase 20 maybe?

[ponyakr]

The Summit cams are cheap. The Crower cams are High. Here's a few more choices that might work.

Lunati 10510312

https://www.lunatipower.com/street-m...8-276-286.html

Crane 283951

https://www.summitracing.com/parts/c...IaAusEEALw_wcB

Howards 410141-12

https://www.summitracing.com/parts/hrs-410141-12

If you wanna stay with the low lift, the Melling SPC-3 is supposed to be similar to the Pontiac 744. The Summit 2801 is similar to your 068, with more lift.

Sometimes the Melling cams are cheaper from an Ebay store, especially if you can find one that doesn't charge tax. Sometimes Auto Zone actually has the best total price.

https://www.ebay.com/itm/Engine-Cams...kAAOSwbFdfceWE

[Nyairguard]

Called mike at lunati to discuss the 10510312lk and confirmed the fit and he stated as a very good match for my current setup also guaranteed me the lifters in this kit are made in the USA . So I placed the order even gave me free shipping so for the 216.99 I feel good with this purchase, thanks for the help fellas and will report back my likes and if any dislikes

[steve25]

What year HO is it?

If it's a 69 then it should have the casting 48 heads with a small 66 CC chamber and the compression ratio provided by such heads can have a great impact on your Cam pick!

[ponyakr]

Originally Posted by steve25

What year HO is it?

If it's a 69 then it should have the casting 48 heads with a small 66 CC chamber and the compression ratio provided by such heads can have a great impact on your Cam pick!

"...I have a orig 350ho and I benched the orig engine..."

He mentioned that the heads on his 400 will have 76cc chambers. So, I assume that means that somebody measured the chambers.

"...76 cc heads..."

So, apparently, the original 350HO heads are still on the "benched" 350HO engine.

As most here know, by now, the static CR will also depend on deck height, as well as head gaskets & chamber volume.

He mentioned that his CR is 10.06. So apparently somebody did a calculation of it. If it was a guess, I assume it would have been rounded off to "around 10:1 ".

"...10.06 compression..."

Don't know exactly how accurate this calculator is. But it should be somewhere in the ball park.

http://www.wallaceracing.com/cr_test2.php

[Nyairguard]

#13 heads with large valves and 995 comp springs . At 1.700 height ss valves
Some of the specs from the build sheet yes my orig heads staying on my 350

[ponyakr]

Another high priced Crower cam that Cliff has mentioned some guys using in 400's is the #60243.

https://www.crower.com/pontiac-287-4...m-284-hdp.html

I suppose the next step up from that would be the Howards 410051-14, then the 041 clones. Lots of guys have been disappointed with the 041, in street 400's. Wouldn't even consider one without Rhoads lifters.

https://www.summitracing.com/parts/hrs-410051-14

[The Champ]

The 60243 is the one I went with after talking with Cliff for my 9.5 compression 462 with 2.5" RA exhaust maninfolds, #96 heads and a quadrajet. Happy with my results.

[Nyairguard]

The lunati specs look good I will have to look at the cam card, a lot of the cams are not in stock at a few places like JEGS and summit some are a month or so out ?? Only quick one is the summit 2802 only thing I don’t like is the lift seems kinda tall I think . 488 and the stiff springs from comp that we’re installed not sure if that’s too much or acceptable

[Steve C.]

If you have a verified 1.700" installed height and using the 995 springs do the math and look at the distance from coil bind with the Summit 2802 cam using a 1.5 rocker ratio !


.

[Nyairguard]

I did verify, never knew there was a calc for that .620 max lift thanks for the tip

[Steve C.]

Comps specification stating 0.620" max lift presumes a 0.060" safety margin.

https://www.hotrod.com/articles/how-...rance-is-safe/

.

[ponyakr]

"...lunati specs look good..."

You can contact Lunati to see if they have what you want, on the shelf, or when they could ship one. They ship direct.

Only $10 shipping charge. I assume they also charge tax.

Will cost more than twice the price of a Summit cam.

I bought a Summit 2802 a couple of years back. It's cheap alright. The main thing I didn't like about it was that the lobes were not nearly as wide as the Lunati lobes. I don't have a clue WHY the Lunati lobes are wider, OR if it makes ANY difference, at all.

Maybe some of you experts can explain the pros & cons of lobe width.

[Nyairguard]

I will call lunati and get the skinny
looking back I feel I should have reached out to len williams for one of his builds

I called the shop that built this 400 and I told them that I didnt like the way the 1.65 rockers let the push rods rest on the heads I never ran them and put a set of 1.50 on so I can sleep at night. he told me that it would be fine and I read too much. I looked for a good block to build but at the time it made sense to buy a complete engine I figured if I bought an engne for 1000 and tore it down and another 500 for sonic and magnaflux just to find a bought a 1500 min. boat anchor...ugh

[Jay S]

Here is another Erson spring that would be better yet.. They would need some matching retainers to. I think did this Erson spring on a Crower 60919 in a 455 with 1.5s.

http://www.pbm-erson.com/Catalog/Ers...prings/PBM3000

[Nyairguard]

transam474
I see your other posts here , spotts sells his version also, his ad states you can advance 2 degrees to get a bit more bottom did you do that also how much idle vacuum you seeing? spotts states the highest quality lifters in his kits not sure on the summit

[TransAm 474]

Originally Posted by Nyairguard

transam474
I see your other posts here , spotts sells his version also, his ad states you can advance 2 degrees to get a bit more bottom did you do that also how much idle vacuum you seeing? spotts states the highest quality lifters in his kits not sure on the summit

When degreeing the 2802 camshaft, we used the method of Intake/Exhaust lobe lift relation at TDC, instead of using the Intake Centerline method. Camshaft guru Harold Brookshire used to say that as long as the Intake Lobe lift is .025"-.045" higher than the Exhaust Lobe lift at TDC, you will have a well running engine. So thats how we did it. It's harder to get that .025"-.045" with the wide 114° lobe seperarion, but we degreed it to where the Intake Lobe lift came out .0275" higher than the Exhaust at TDC. The Intake Centerline came in at about 106.5° at that, so yes, we have the 2802 installed at about 2.5° advanced from the 109° it states on the cam card. Plenty of people installing them at the 109° it states on the cam card with great results though. We haven't got to drive the car yet, as it is in the middle of complete restoration, but it seems to sound great. We haven't had a vacuum gauge on it yet, but the idle is pretty mild, not really much attitude at all, so I would say it has pretty good vacuum. If I can think to check it next time we have it running, I sure will.

Do you by chance have a link to that spotts camshaft?