Your donations help keep this valuable resource free and growing. Thank you.
|
Best Cam Upgrade for stock 360??? |
Post Reply | Page 123 5> |
Author | |
amx73
AMC Nut Joined: Aug/28/2009 Location: NJ Status: Offline Points: 294 |
Post Options
Thanks(0)
Posted: Jun/19/2018 at 6:28am |
So, I'm thinking about putting a cam in my stock 360. Its got Hedmann 1 5/8 tube headers, Edelbrock Performer intake, Edelbrock 600cfm carb, and HEI distributor. Trans is a stock 727, and I believe the rear is 2.72 or 3.08? A stock 73' 360 with a 4bbl and dual exhaust is 220HP, with my upgrades its probably 250ish HP? Would like something very streetable, with improved throttle response. I'm thinking the Comp 268H grind is the largest I could go without changing valve springs...?
Jake |
|
Red means run son, numbers add up to nothin'!
|
|
WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
Post Options
Thanks(0)
|
Based on my recent experience, with the stock valve springs, you will see valve bounce around 5,500 rpm, so probably a good idea to throw some new performance springs at it and you should be able to turn +6,000 RPM. Somewhere round 270 advertised duration is probably good, watch the lift, the valve retainers can hit the valve stem seals and or valve guides if you go to high, watch out particularly if you are above 0.500" lift. Aftermarket retainers and locks can give you a bit more clearance here. Depending on which heads you have, you may or may not need some other valve train upgrades.
|
|
Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7903 |
Post Options
Thanks(0)
|
|
|
SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
Post Options
Thanks(1)
|
Comp 268H
Isky 270HL |
|
gremlinsteve
AMC Addicted Joined: Dec/16/2008 Location: houston Status: Offline Points: 884 |
Post Options
Thanks(0)
|
Or a summit 8600
|
|
PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5905 |
Post Options
Thanks(0)
|
Chet Herbert A4B from late 1980's '69 AMC Stock Camshaft Reground, Straight Up, failed to get a Base Circle measurement... Self Degree Wheel Measured, not guaranteed... .512" Lift Intake at Valve, 1.6 Rocker 280* @ .005 227* @ .050 (? 58* ramps) ( assumed symetrical ) 112* ATDC = Intake CL .529" Lift Exhaust at Valve, 1.6 Rocker 295* @ .005 246* @ .050 (? 61* ramps) ( assumed symetrical ) 112* BTDC = Exhaust CL IN opens .050 @ 2* BTDC - .005 @ 31* BTDC IN closes .050 @ 45* ABDC - .005 @ 73* ABDC (DynCR) .050 @ 227* - .005 @ 284* EX opens .050 @ 53* BBDC - .005 @ 77* BBDC EX closes .050 @ 13* ATDC - .005 @ 39* ATDC .050 @ 246* - .005 @ 296* Overlap .050 @ 15* - .005 @ 70*
|
|
farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19612 |
Post Options
Thanks(0)
|
I'd stick with more of a torque cam and keep stock valve springs. No cam lobe wipe issues running regular oil with no additives. If you go much over 300# on the valve springs you have to use a high pressure additive. Stock springs are under 300#. With a high gear rear (low number, 2.87-3.15) a torquey cam will feel better taking off anyway. Keep rpm under 6K (5.5K if valves start to float there). A towing/RV cam will work great. You can build an engine for torque and get great throttle response and keep it at moderate rpm. It will feel real strong. Or build for high HP -- which means you need to turn it up in rpm to get the power, and it won't have much throttle response without a higher stall converter (lets engine rev up before moving) and more gear in the back since it doesn't make as much torque at lower rpm either. So the 268H is about the biggest I'd put in -- power is supposed to start at around 1500 rpm. I wouldn't use a cam that doesn't "come in" later than around 1500 with a stock converter and rear gears. A 270 duration is usually spec'd at around 1800 rpm... that's pushing it just a little, but workable. 260-270 would be good for a street/strip car that sees more street than strip use... IMHO. I don't care about a "lopey" idle, but I know some guys like it. I prefer my engines to run smooth.
|
|
Frank Swygert
|
|
amx73
AMC Nut Joined: Aug/28/2009 Location: NJ Status: Offline Points: 294 |
Post Options
Thanks(1)
|
This Lunati cam looks like it might do the trick? I also have a 3.54 gear set and a posi I could through in there too!
|
|
Red means run son, numbers add up to nothin'!
|
|
Dave Z
AMC Nut Joined: Jul/02/2007 Location: Massachusetts Status: Offline Points: 300 |
Post Options
Thanks(0)
|
I'm sure any of the cams recommended here will work fine. But just because everyone has an opinion, here's mine. Call Bullet Racing Cams at (662)893-5670. Tell them what you have and what you want it to do and they will custom grind a camshaft for your specific application. It doesn't get better than that.
Dave Z |
|
purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
Post Options
Thanks(0)
|
|
|
Post Reply | Page 123 5> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |