pologreen1
Member
here is some of the info I have been getting thanks for your time. BTW I currently have V/C off so I want to do rr's,
1.You can go with 1.7s. All you need to do is research your present camshaft lift, then add .065 (to be on the safe side) to that lift figure to give you what your new valve lift will be. Then find a set of springs that are spec'd to handle at least that much lift.
I'm running CompCams's 987 dual springs with a damper and they're good for .600 valve lift. Of course, there are other options available; I just prefer dual springs over single springs like the beehives are.
If you're still unsure, give CompCams's Tech Support a free call and they'll tell you what'll work. Don't be surprised if he recommends Beehives though; they seem to be pushing those.
Be sure to tell him you want springs that are a true BOLT-ON; that you don't want to have to modify the heads for the new springs to fit. Buy matching retainers and locks at the same time.
Crane makes a kit containing springs, retainers, locks and shims which are also dual springs. I believe the kit number is 10308. They're good for .600 lift too. Check SummitRacing.com for more specifics.
2.A bigger ratio rocker will give benefits but when used on the wimpy stock cam not enough to justfy the cost.
Would be better value to buy a new cam that has the lift you want built on the cam.
Roller rockers work ; even the roller tip Comp ones are good but you have to look at what you are starting with; in the case of a stock cam , bugger all.
90-91 L98 202'/207' Lift (w/1.5) .413"/.428"
Lift with 1.6 rockers only .440/.456
You could throw a ZZ4 cam from eBay ($100) and a set of ZZ4/LT4 springs ($40 ) in there and get .470 / .510.
And still use your stock rockers.
1.7's are a bit exotic for a stocker; on stock cam only gets you out to .485 and prob need new pushrods , more $$$
1.You can go with 1.7s. All you need to do is research your present camshaft lift, then add .065 (to be on the safe side) to that lift figure to give you what your new valve lift will be. Then find a set of springs that are spec'd to handle at least that much lift.
I'm running CompCams's 987 dual springs with a damper and they're good for .600 valve lift. Of course, there are other options available; I just prefer dual springs over single springs like the beehives are.
If you're still unsure, give CompCams's Tech Support a free call and they'll tell you what'll work. Don't be surprised if he recommends Beehives though; they seem to be pushing those.
Be sure to tell him you want springs that are a true BOLT-ON; that you don't want to have to modify the heads for the new springs to fit. Buy matching retainers and locks at the same time.
Crane makes a kit containing springs, retainers, locks and shims which are also dual springs. I believe the kit number is 10308. They're good for .600 lift too. Check SummitRacing.com for more specifics.
2.A bigger ratio rocker will give benefits but when used on the wimpy stock cam not enough to justfy the cost.
Would be better value to buy a new cam that has the lift you want built on the cam.
Roller rockers work ; even the roller tip Comp ones are good but you have to look at what you are starting with; in the case of a stock cam , bugger all.
90-91 L98 202'/207' Lift (w/1.5) .413"/.428"
Lift with 1.6 rockers only .440/.456
You could throw a ZZ4 cam from eBay ($100) and a set of ZZ4/LT4 springs ($40 ) in there and get .470 / .510.
And still use your stock rockers.
1.7's are a bit exotic for a stocker; on stock cam only gets you out to .485 and prob need new pushrods , more $$$
