But what do I do about my old firing order?! All cams that I see on summit that are roller have the HO/351w firing order! I have the worst luck ever. In other words I have a roller block that's a non-HO with an old firing order!
Ordered camshaft too early! HELP!
Laughing Gas
Joined: Dec 2007
Posts: 959
Likes: 8
From: Imperial, MO
Run the roller cam and run the HO firing order (just swap the #3 and #5 plug wires and the #7 and #4 plug wires on the distributor cap). The cam designates the firing order you use. It's that simple.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Do not put that flat tappet cam in your motor, it has to be broken in correctly and if that goes OK(there is a very high failure rate on these cam) you must add a ZDDP additive to the engine oil for ever more. Besides the cam and lifters you would also need longer pushrods and a cast iron distributor drive gear.
I suggest you send it back and get the Crane 2020 "truck power" cam or the Comp 35-512-8, both of these cams use the HO firing order but that doesn't matter with batch fired EFI and we know this because the injectors are wired the same on a batch fired 5.8 motor.
I suggest you send it back and get the Crane 2020 "truck power" cam or the Comp 35-512-8, both of these cams use the HO firing order but that doesn't matter with batch fired EFI and we know this because the injectors are wired the same on a batch fired 5.8 motor.
Logistics Pro
Joined: Mar 2012
Posts: 3,507
Likes: 121
From: Oregon
What Conanski is saying is that the flat tappet cams are harder to break in properly and once they are he will have to run an additive in the oil to prevent premature wear. In other words, more hassle to convert than to just get a roller cam for it.
Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
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Elder User
Joined: Jun 2010
Posts: 641
Likes: 0
From: TX
I have the comp cams additive for initial break in, and I have a strict deadline but honestly you guys are scaring me already and i'm freaking out bad again!! I can't have this thing break down right after a damn rebuild, that chit is crazy!! I am stressing bad man! Are flat tappets really that BAD?!
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Are flat tappets really that BAD?!
When you have "modern" block that is already set up to run rollers? yea
You jumped the gun no big deal, call them explain what happen and return that stuff get the correct parts.
Make sure they understand its your fault but you need them ASAP, they'll work with you give em a chance.
When you have "modern" block that is already set up to run rollers? yea
You jumped the gun no big deal, call them explain what happen and return that stuff get the correct parts.
Make sure they understand its your fault but you need them ASAP, they'll work with you give em a chance.
Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
All you have to do is run oil additve in your oil. Its not a bad thing and it will help your motor last even longer. I'm doing the same thing with my new motor don't frett brother its not going to blow up. Just add the additive and you won't have any problems keep your head up man. Don't stress all will be just fine
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
this is already a huge expense on a rebuild for $1062
Another reason not to use it, all the money and time spent but then use old technology in a engine made to use a later more modern system?
The valve train is hard to spin all the valve springs working against it, valves want to stay shut springs and friction constantly working against opening them. Roller cam system is simply easier to turn due to reduced near eliminated friction at the follower. Equates to reduced loading on the engine and before its loaded.
Its entirely up to you of course but myself no way I'd consider going back to flat tappet cam/lifters system in one of my engines. Not doing a cam swap and certainly not as part of a compete rebuild and or because I just happen to order the wrong parts first time around.
Another reason not to use it, all the money and time spent but then use old technology in a engine made to use a later more modern system?
The valve train is hard to spin all the valve springs working against it, valves want to stay shut springs and friction constantly working against opening them. Roller cam system is simply easier to turn due to reduced near eliminated friction at the follower. Equates to reduced loading on the engine and before its loaded.
Its entirely up to you of course but myself no way I'd consider going back to flat tappet cam/lifters system in one of my engines. Not doing a cam swap and certainly not as part of a compete rebuild and or because I just happen to order the wrong parts first time around.
Cargo Master
Joined: Dec 2009
Posts: 3,452
Likes: 2
From: Santa Fe Tx
This falls under "I didn't build MY truck to please you". I went from efi to a carb in my 89 cause I wanted to because IMHO it is a better system. I also used flat tappet can cause I believe its a better system. Its what I prefer. Yeah he orders the wrong parts whooop te do. He is liking the way his truck is turning out. That's ALL that matters here.