Which valve springs for LT4 hotcam on 083 heads?
08-13-2015, 09:31 AM
#1
Junior Member
Thread Starter
Join Date: Jan 2014
Location: Chicago, IL
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 Camaro IROC-Z
Engine: 5.7/350
Transmission: 700r4
Which valve springs for LT4 hotcam on 083 heads?
I will be installing an LT4 hotcam into my L98 soon but I've been searching a ton and can't seem to find a proper set of valve springs with the stock 1.25" diameter. I will be running the cam with 1.5rr which is said to be around .492 lift. Don't want to do any machining to the valve pockets or none of that. Im looking at the Scoggin Dickey SD1007 (https://sdparts.com/details/scoggin-dickey-parts-center/ksd1005) includes the springs, retainers, and locks all for $90. Other set im looking at is the Comp Cams 983 kit (http://m.summitracing.com/parts/cca-983-kit). What do you guys think?
08-13-2015, 09:50 AM
#2
Re: Which valve springs for LT4 hotcam on 083 heads?
You will want to check the clearance between the retainer and valve guide seal to see what you can get away with. Comps 26918 beehive kits are suppose to give more clearance over conventional springs. A shaved down retainer can also help give clearance.
Manley has a 22410 single spring in stock diameter that can work too. With .045" shim underneath and .050 offset locks, you could run near .520" lift or so. But again need to measure to be sure
Manley has a 22410 single spring in stock diameter that can work too. With .045" shim underneath and .050 offset locks, you could run near .520" lift or so. But again need to measure to be sure
08-13-2015, 10:35 AM
#3
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,030
Received 1,664 Likes
on
1,262 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Which valve springs for LT4 hotcam on 083 heads?
LS springs w Comp 787 retainers is probably the easiest cheapest guaranteed solution. PAC 1218 http://texas-speed.com/p-4406-pac-ra...e-springs.aspx would be a good choice.
08-13-2015, 11:05 AM
#4
Junior Member
Thread Starter
Join Date: Jan 2014
Location: Chicago, IL
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 Camaro IROC-Z
Engine: 5.7/350
Transmission: 700r4
Re: Which valve springs for LT4 hotcam on 083 heads?
LS springs w Comp 787 retainers is probably the easiest cheapest guaranteed solution. PAC 1218 http://texas-speed.com/p-4406-pac-ra...e-springs.aspx would be a good choice.
08-13-2015, 11:26 AM
#5
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,030
Received 1,664 Likes
on
1,262 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Which valve springs for LT4 hotcam on 083 heads?
Prolly OK; don't know the specs offhand, so can't compare...
08-13-2015, 01:11 PM
#6
Supreme Member
Join Date: Jul 2007
Location: Howard Lake, MN
Posts: 1,293
Likes: 0
Received 4 Likes
on
4 Posts
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: Which valve springs for LT4 hotcam on 083 heads?
why not use the springs that the smart guys at GM spec'd out for that cam? GM used to sell them as a kit with stock lightweight retainers and keepers for not too much money.
Trending Topics
08-13-2015, 02:25 PM
#8
Junior Member
Thread Starter
Join Date: Jan 2014
Location: Chicago, IL
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 Camaro IROC-Z
Engine: 5.7/350
Transmission: 700r4
Re: Which valve springs for LT4 hotcam on 083 heads?
Orr89RocZ is exactly correct, or else i would get those but i dont want to machine the pockets out to fit those in there
08-14-2015, 07:52 PM
#9
Supreme Member
Re: Which valve springs for LT4 hotcam on 083 heads?
If you upgrade the retainers (beehive or Scoggin Dickey kit) you need to put a 1/16" shim in the exhaust spring pockets. They are deeper on the exhaust side to make up for the thicker exhaust rotator/retainer these heads used stock. Ditch that for any non-rotator/retainer and you have to shim to get the installed height back up to match the intake side.
Thread
Thread Starter
Forum
Replies
Last Post