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#41
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Pushrod is straight. 60thou+ clearance. Engine still ran great.
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#42
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Not always but i try to use good oil. Been using 10w40 full or semi synthetic. Ived used plenty of mobil1 and brad penn in this engine but not always. Always use wix filters
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#43
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Quote:
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#44
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Quote:
Im still leaning towards a cam failure not a lifter failure. The other lobes vary in appearance but none of the other have degraded to this level. They are inconsistant for sure
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#45
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Quote:
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#46
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Quote:
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#47
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Comp told me 200 on the seats if running solid rollers on their hyd roller cams.FWIW,Tom
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#48
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Sorry,forgot you had hyd rollers on it!Brain fart.Tom
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#49
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Quote:
Last edited by Jay S; 04-05-2024 at 08:19 AM. |
#50
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I had a single lobe on a CC HR (billet, not sure which one) repaired by CC and it worked out well.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#51
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Interesting.
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#52
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Call them up and tell them the SN of your cam and they will know if it can be fixed.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#53
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My concern is how to make sure this doesn't happen again. Whats the most reliabe street/strip setup going these days?
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#54
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Not directly related to the above question but it was interesting despite being old....
CONSUMERS RANK THE BEST CAMSHAFT BRANDS https://hedgescompany.com/blog/2012/...etical%20order). .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#55
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Quote:
I'm dealing with my own 10 year issues on my build and it sucks as it's all kind of snowballing a little bit. But I do think that some of these things that we use have to be thought of as wear items to an extent. I think if we want to get 50K+ and 20 years of service out of these parts, they are going to have to be engineered closer to OEM specs. If we use the LS engines as an example, we know they use lazy lobes and low springs pressures. They also benefit from much lighter valvetrain components. So, this means we likely need to look at older, lazier cam lobes and look to making the valvetrain as light and as stable as possible. This may mean looking to things like beehive springs with titanium retainers and lighter valves than we typically run. We need to be able to get the spring pressures down. Without being able to do that, I think the lifters specifically, have a shelf life.
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-Jason 1969 Pontiac Firebird |
The Following 2 Users Say Thank You to JLMounce For This Useful Post: | ||
#56
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Without getting too detailed on what you could do different, for how yours failed, an improvement would be to have that HR cam ground on a 8620 core next go around. The 8620 surface is tougher, it wouldn’t flake out as easy. The Bullet HR cam I have in my TA is on an 8620 core.
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#57
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If I was to build a new street engine I would do acomp hyd roller cam based on the Magnum lobes and run 1.50 rockers.I would use lightweight valves maybe smaller stems and light weight retainers and would hope they would be able to use like 130-140 on the seats .FWIW.Tom
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#58
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That's what Ive always strived to do with engine builds Tom. Make the drivetrain parts as light as possible in the hopes that I can run less spring pressure to control things.
Pontiacs are almost as bad as other engine makes like big Chevy and big ford when it comes to valvetrain weight. One reason I like the parts AFR uses in their heads. They are the only aftermarket head I'm aware of that uses an 8mm valve stem. Everyone else uses 11/32. It's only cutting ounces but that's the goal. By doing things like that on my BBC, which are terrible for valve train weight, even though I still run 150 lbs on the seat, it's gone 25 years and thousands of miles without a valve cover removed and spins 6500 on a hydraulic roller with a 2.25 intake valve. I would imagine after all these years the valve springs might have 140 lbs or even less spring pressure. Not positive any of that helps but I've had excellent success knock on wood. Other things you could look into is cryo treating. Things like springs etc... the 327 my son is doing he had Paul cryo treat the entire engine, valve train, block, crank etc....this one is being built to rpm with a hydraulic roller and make some steam with a peanut motor |
The Following User Says Thank You to Formulajones For This Useful Post: | ||
#59
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If it had a OF cam it would have had all magnum lobes. OF2 has more aggressive XR’s on the intakes
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#60
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Thanks for the input guys that helps. Yes this cam has magnum lobes. Jon
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
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