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Old 04-10-2022, 07:31 AM
Bob Timmermans's Avatar
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Cool Quick cam suggestions ?

I've run in a fresh 462 and ran into a oil pan leak , valley pan leak and a light coating of milky substance on the inside of the valve covers.
Needles to say I removed the engine and am in the proces of taking it apart again.

I've always been wary about the XE274H cam in the build ( negative posts ).
The problems I'll address but , I've been searching thrue a lot of posts about a fitting cam and I only get more confused about the load of info to absorb.


My goal was 500 hp
So now that it's on the engine stand and I need to order parts anyway , any quick suggestions on the cam ?

462 , BRC pistons , eagle rods , eagle cast crank.
KRE D-ports cleaned up and 2.11/1.66 valves , Harland Sharp 1.5 RR
Q-jet modified according to Cliffs instructions , RPM intake.
Everything port matched , Hedman 1 3/4 headers.
TH400 / TCI converter stall 2000 , 3.31 : 1 gears.

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Old 04-10-2022, 09:58 AM
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DO you have any flow numbers on the heads?

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Old 04-10-2022, 01:34 PM
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If they where just cleaned up they likely flow some 272 intake cfm at between .550” and .600”.

They should make you a easy 500 hp if your compression is atleast 9.5 and if your new can pick will provide you with .550” lift, which should be your target number to hit.

Those HR rockers check in at 1.6 in ratio.

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Old 04-10-2022, 03:55 PM
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Check out the specs of the SD Performance "stump puller" cam. Something similar to that should work well in your build. I have used that cam with great results in a 461 iron head and a 455 KRE head motor. One car had 3.31 gears and the other had 3.08 and 3.42 gears. Cam worked well in all of them.

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Old 04-10-2022, 04:36 PM
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Bob, I have something similar, but with a T2/Demon, 3200 converter. I ordered the top end stuff from SD Perf. I told Dave I wanted around 500 hp and to get down the track in around 11.5 in a 3200 lb car. He set me up with KRE 295 @ .550" dports and a .570 lift Stump Puller.

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Old 04-11-2022, 12:12 AM
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The heads should flow 270 cfm. cleaned up.
Compression calculated to 10.33:1.

I'm going to check out SD .

Thanks , Bob.

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Old 04-11-2022, 12:47 AM
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I checked out SD for the 'old faithfull ' cam and I'm no 'scrooge' but the price difference between the XE274H $ 170.00 and old faithfull $ 470.00 is something that boggles my mind ?

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Old 04-11-2022, 01:33 AM
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The SD performance one is a hydraulic roller, the XE274H looks like a hydraulic flat tappet at that price? HR cams are just more expensive.

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Old 04-11-2022, 01:42 AM
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Oil leak related.. Invest in a ONE PIECE oil pan seal.
be gentle with the edges, but It can solve many leaking issues.

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Old 04-11-2022, 03:35 AM
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Hard to go wrong with the RAIV cam (Melling SPC3) for a street 455.

I would avoid the XE-cams like the plauge. Noisy ping prone POS on anything but 7.5:1 CSB.

JMHO

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Old 04-11-2022, 06:47 AM
74Grandville 74Grandville is offline
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Quote:
Originally Posted by Kenth View Post
Hard to go wrong with the RAIV cam (Melling SPC3) for a street 455.

I would avoid the XE-cams like the plauge. Noisy ping prone POS on anything but 7.5:1 CSB.

JMHO

I think you meant to say spc-8 for RAIV

Spc-3 = rounded nose 744


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Old 04-11-2022, 09:57 AM
78w72 78w72 is offline
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Quote:
Originally Posted by 25stevem View Post
If they where just cleaned up they likely flow some 272 intake cfm at between .550 and .600.

They should make you a easy 500 hp if your compression is atleast 9.5 and if your new can pick will provide you with .550 lift, which should be your target number to hit.

Those HR rockers check in at 1.6 in ratio.
1.5 HR rockers are really 1.6?

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Old 04-11-2022, 10:55 AM
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Quote:
Originally Posted by 78w72 View Post
1.5 HR rockers are really 1.6?
I'd like to hear more about this too as I have them in my engine. I always thought under pressure they would flex and be closer to the 1.5

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Old 04-11-2022, 12:38 PM
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Originally Posted by grivera View Post
I'd like to hear more about this too as I have them in my engine. I always thought under pressure they would flex and be closer to the 1.5
i have read that the 1.65 are closer to 1.7 or 1.72... but this is the first ive heard that the 1.5s are really a full 1.6. i have the HS 1.5s too & have been considering going to 1.65 for a little extra lift & duration on my E- head 467 with OF cam.

anyone else heard of this or can confirm it?

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Old 04-11-2022, 01:09 PM
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SD Performace website list the HS 1.5 rocker ratio as "actual ratio is typically around 1.55." also mentions the 1.65 ratio closer to 1.7-1.72 as well

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Old 04-11-2022, 02:04 PM
llwta76 llwta76 is offline
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I went through this a couple yrs ago with the HS rockers. I checked the lift of HS 1.65 using light checking springs with a dial indicator and got a ratio of 1.78. However after installing the running springs the actual ratio dropped to 1.69.
I did the same test with my HS 1.5 s and got a running ratio of 1.56

The aluminum rockers flex a bit when fully loaded.
BTW: Test was done using CC valve springs with 350# at .560 lift
Larry

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Old 04-11-2022, 03:03 PM
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Quote:
Originally Posted by 74Grandville View Post
I think you meant to say spc-8 for RAIV

Spc-3 = rounded nose 744


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You are absolutely correct, SPC-8 it should be.

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Old 04-11-2022, 03:56 PM
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Exhaust ti intake ratio flow?

Bullet has the Ultradyne lobes I've had good luck with .

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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Old 04-12-2022, 12:17 PM
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Quote:
Originally Posted by 78w72 View Post
i have read that the 1.65 are closer to 1.7 or 1.72... but this is the first ive heard that the 1.5s are really a full 1.6. i have the HS 1.5s too & have been considering going to 1.65 for a little extra lift & duration on my E- head 467 with OF cam.



anyone else heard of this or can confirm it?
Oh yes... years ago running circle track we had a rule for max lift at the valve. On paper my total lift was within spec, but when checked by officials after a feature win, my advertised 1.55 rockers were closer to 1.6xx and put me over the limit. You almost need to check with a dial indicator or work with a known source to have an exact number.

Sent from my SM-G965U using Tapatalk

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Old 04-13-2022, 05:27 PM
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Quote:
Originally Posted by Bob Timmermans View Post
I've run in a fresh 462 and ran into a oil pan leak , valley pan leak and a light coating of milky substance on the inside of the valve covers.
Needles to say I removed the engine and am in the proces of taking it apart again.

I've always been wary about the XE274H cam in the build ( negative posts ).
The problems I'll address but , I've been searching thrue a lot of posts about a fitting cam and I only get more confused about the load of info to absorb.


My goal was 500 hp
So now that it's on the engine stand and I need to order parts anyway , any quick suggestions on the cam ?

462 , BRC pistons , eagle rods , eagle cast crank.
KRE D-ports cleaned up and 2.11/1.66 valves , Harland Sharp 1.5 RR
Q-jet modified according to Cliffs instructions , RPM intake.
Everything port matched , Hedman 1 3/4 headers.
TH400 / TCI converter stall 2000 , 3.31 : 1 gears.
Good ol' Schneider cams.
Been around since the 50's or 60's.
Not sure whar exactly you're looking, so I'll provide links to a few pages.
Straight up solid lift and hydro roller cams are apparently custom grinds these days.

http://schneidercams.com/hydraulicli...shafts-23.aspx
http://schneidercams.com/solidroller...shafts-13.aspx

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