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Old school 340 cam ??s #3117364 01/28/23 09:41 PM 01/28/23 09:41 PM
Joined: May 2006 Posts: 1,073 oregon G greendart408 OP super stock
greendart408 OP super stock G Joined: May 2006 Posts: 1,073 oregon	I recently purchased a old school built in 74 340, and not ran since. Trw full domes, crane r280/427, 108. Mopar part number P3690795 Solid roller, block is o ringed. Etc etc, It’s a killer old school build. Anyhow does anyone know what the spring is that cam calls for pressure wise? I can’t find any info. The box of springs that came with it and was ran in the garage only says 475 on the paper work. Unfortunately it’s a cast core it looks like....

Re: Old school 340 cam ??s [Re: greendart408] #3117382 01/28/23 10:30 PM 01/28/23 10:30 PM
Joined: Aug 2003 Posts: 43,119 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,119 Bend,OR USA	I'm thinking 200 to 220 Lb. on the seats and 450 to 480 open on cast core Isky solid roller cams, based on my bad memory Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Old school 340 cam ??s [Re: greendart408] #3118820 02/04/23 10:39 AM 02/04/23 10:39 AM
Joined: Jan 2011 Posts: 137 Daytona Beach, FL C cknight member
cknight member C Joined: Jan 2011 Posts: 137 Daytona Beach, FL	Crane did not make any cast roller cores for the LA engines. A 698851 would be ground on an 8620 carburized steel billet, which is copper colored between the lobes.

Re: Old school 340 cam ??s [Re: cknight] #3118890 02/04/23 03:54 PM 02/04/23 03:54 PM
Joined: May 2006 Posts: 1,073 oregon G greendart408 OP super stock
greendart408 OP super stock G Joined: May 2006 Posts: 1,073 oregon	Originally Posted by cknight Crane did not make any cast roller cores for the LA engines. A 698851 would be ground on an 8620 carburized steel billet, which is copper colored between the lobes. It’s not copper between the lobes and looks like any ft cam ?

Re: Old school 340 cam ??s [Re: greendart408] #3118898 02/04/23 04:40 PM 02/04/23 04:40 PM
Joined: Feb 2015 Posts: 2,070 CA C crackedback top fuel
crackedback top fuel C Joined: Feb 2015 Posts: 2,070 CA	Numbers on the end of the cam?

Re: Old school 340 cam ??s [Re: crackedback] #3118902 02/04/23 05:03 PM 02/04/23 05:03 PM
Joined: May 2006 Posts: 1,073 oregon G greendart408 OP super stock
greendart408 OP super stock G Joined: May 2006 Posts: 1,073 oregon	Originally Posted by crackedback Numbers on the end of the cam? Ba-1852 on the gear side and R-280/427-8 on the front, I will show pics when I can. Last edited by greendart408; 02/04/23 06:26 PM.

Re: Old school 340 cam ??s [Re: greendart408] #3118944 02/04/23 10:10 PM 02/04/23 10:10 PM
Joined: Aug 2019 Posts: 9,428 Super Spudsville Mr PotatoHead Half Baked
Mr PotatoHead Half Baked Joined: Aug 2019 Posts: 9,428 Super Spudsville	Old DC book shows P3690795 R280-427-110 Crane 280 .640 108 Book lists this spring number if you can find the specs for it. P3412068 Probably got the old short crane roller lifters with it? Last edited by Mr PotatoHead; 02/04/23 11:18 PM. STOP POTATO HATE!

Re: Old school 340 cam ??s [Re: Mr PotatoHead] #3118968 02/05/23 12:11 AM 02/05/23 12:11 AM
Joined: May 2006 Posts: 1,073 oregon G greendart408 OP super stock
greendart408 OP super stock G Joined: May 2006 Posts: 1,073 oregon	Originally Posted by Mr PotatoHead Old DC book shows P3690795 R280-427-110 Crane 280 .640 108 Book lists this spring number if you can find the specs for it. P3412068 Probably got the old short crane roller lifters with it? Thanks for the info, I got some crane lifters with it that I’m scared to use by the looks of them. Anyone ran these lol?

Re: Old school 340 cam ??s [Re: greendart408] #3118974 02/05/23 12:33 AM 02/05/23 12:33 AM
Joined: Aug 2019 Posts: 9,428 Super Spudsville Mr PotatoHead Half Baked
Mr PotatoHead Half Baked Joined: Aug 2019 Posts: 9,428 Super Spudsville	A big NO on running them. Myself, I can work with old parts and even cast core roller cams but not those lifters. STOP POTATO HATE!

Re: Old school 340 cam ??s [Re: Mr PotatoHead] #3118986 02/05/23 02:22 AM 02/05/23 02:22 AM
Joined: May 2006 Posts: 1,073 oregon G greendart408 OP super stock
greendart408 OP super stock G Joined: May 2006 Posts: 1,073 oregon	Originally Posted by Mr PotatoHead A big NO on running them. Myself, I can work with old parts and even cast core roller cams but not those lifters. 100 percent agreed....

Re: Old school 340 cam ??s [Re: greendart408] #3118988 02/05/23 02:32 AM 02/05/23 02:32 AM
Joined: Aug 2003 Posts: 43,119 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,119 Bend,OR USA	Originally Posted by greendart408 Originally Posted by Mr PotatoHead Old DC book shows P3690795 R280-427-110 Crane 280 .640 108 Book lists this spring number if you can find the specs for it. P3412068 Probably got the old short crane roller lifters with it? Thanks for the info, I got some crane lifters with it that I’m scared to use by the looks of them. Anyone ran these lol? Yepper, years ago. I may have one or two pairs left in my cabinet still The bigger diameter solid roller wheel lifters are well worth converting to Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Old school 340 cam ??s [Re: greendart408] #3118993 02/05/23 06:40 AM 02/05/23 06:40 AM
Joined: Mar 2011 Posts: 3,069 Michigan A A727Tflite master
A727Tflite master A Joined: Mar 2011 Posts: 3,069 Michigan	Originally Posted by greendart408 Originally Posted by Mr PotatoHead Old DC book shows P3690795 R280-427-110 Crane 280 .640 108 Book lists this spring number if you can find the specs for it. P3412068 Probably got the old short crane roller lifters with it? Thanks for the info, I got some crane lifters with it that I’m scared to use by the looks of them. Anyone ran these lol? Those lifters were used well in to the 70’s, in B/RB/Hemi without any issues. We went to the Engles later 70’s. Those springs just keep the guide bars in place.

Re: Old school 340 cam ??s [Re: A727Tflite] #3119718 02/07/23 06:56 PM 02/07/23 06:56 PM
Joined: Jan 2011 Posts: 137 Daytona Beach, FL C cknight member
cknight member C Joined: Jan 2011 Posts: 137 Daytona Beach, FL	Wow! Endural cast steel cam core from the late 60's - early 70's. Lifters from the same era, and they probably have .750" wheels. Would pass on using them...

Re: Old school 340 cam ??s [Re: greendart408] #3119751 02/07/23 09:07 PM 02/07/23 09:07 PM
Joined: Jan 2003 Posts: 4,039 Shelby Twp. Mi HardcoreB master
HardcoreB master Joined: Jan 2003 Posts: 4,039 Shelby Twp. Mi	Originally Posted by greendart408 I recently purchased a old school built in 74 340, and not ran since. Trw full domes, crane r280/427, 108. Mopar part number P3690795 Solid roller, block is o ringed. Etc etc, It’s a killer old school build. Anyhow does anyone know what the spring is that cam calls for pressure wise? I can’t find any info. The box of springs that came with it and was ran in the garage only says 475 on the paper work. Unfortunately it’s a cast core it looks like.... I'd map out the events at .200" and post and 'we' can recommend something based on the rocker ratio and rpm etc. It looks like the lifters have been run, they show some signs of 'forking' Cool find anyway!

Re: Old school 340 cam ??s [Re: HardcoreB] #3120093 02/08/23 09:44 PM 02/08/23 09:44 PM
Joined: May 2006 Posts: 1,073 oregon G greendart408 OP super stock
greendart408 OP super stock G Joined: May 2006 Posts: 1,073 oregon	Originally Posted by HardcoreB Originally Posted by greendart408 I recently purchased a old school built in 74 340, and not ran since. Trw full domes, crane r280/427, 108. Mopar part number P3690795 Solid roller, block is o ringed. Etc etc, It’s a killer old school build. Anyhow does anyone know what the spring is that cam calls for pressure wise? I can’t find any info. The box of springs that came with it and was ran in the garage only says 475 on the paper work. Unfortunately it’s a cast core it looks like.... I'd map out the events at .200" and post and 'we' can recommend something based on the rocker ratio and rpm etc. It looks like the lifters have been run, they show some signs of 'forking' Cool find anyway! They have been ran in the garage and at 1 sand drag in 1974.

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