Need Some Advice And Help
07-27-2009, 07:30 PM
#1
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Car: 1987 Iroc-Z28
Engine: 350 TPI
Transmission: 700r4
Need Some Advice And Help
I'm putting a set of Corvette heads in my 350 TPI. Casting number is 10088113. I'm still learning a lot so bare with me.
Should I replace the rockers and valve springs? I plan to run a zz4 cam with these heads. So what size rockers should I get? Or should I keep the stock one's with that cam. Someone guide me in the right direction.
Any help is appreciated.
Should I replace the rockers and valve springs? I plan to run a zz4 cam with these heads. So what size rockers should I get? Or should I keep the stock one's with that cam. Someone guide me in the right direction.
Any help is appreciated.
07-30-2009, 07:20 PM
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Car: 86 T/A, 83 Z/28
Engine: 5.0 TPI, 350 2 X 4 bbl
Transmission: 4 speed auto, 5 speed manual
Axle/Gears: 3.23 posi, 3.73 std
Re: Need Some Advice And Help
If im not mistaked if your car is an original l98 you already have the corvette l98 heads. Now i dont remeber casting numbers too well and i dont remeber which vertion of the l98 head was aluminum and which was cast iron but again if you have an original l98 you have the same heads as the corvette just probably in cast iron. As for the valve springs you should always replace them with atleast new factory springs but you should try to use springs that are recomended for a particular cam. Ide give GM performance parts a call and see what specific springs you should use with that cam or atleast look it up. As for the rockers you dont have to change them but a set of roller rockers would be nice. 1.6 ratio or a 1.5 ratio is a judgement call though.
07-31-2009, 10:00 PM
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Car: 1987 Iroc-Z28
Engine: 350 TPI
Transmission: 700r4
Re: Need Some Advice And Help
If im not mistaked if your car is an original l98 you already have the corvette l98 heads. Now i dont remeber casting numbers too well and i dont remeber which vertion of the l98 head was aluminum and which was cast iron but again if you have an original l98 you have the same heads as the corvette just probably in cast iron. As for the valve springs you should always replace them with atleast new factory springs but you should try to use springs that are recomended for a particular cam. Ide give GM performance parts a call and see what specific springs you should use with that cam or atleast look it up. As for the rockers you dont have to change them but a set of roller rockers would be nice. 1.6 ratio or a 1.5 ratio is a judgement call though.
03-11-2011, 05:28 PM
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Car: 1991 z28
Engine: 305 tpi
Transmission: 700r Automatic
Re: Need Some Advice And Help
just got a 91 z28 runs good but shakes when up to temp but only in motion (in neutral reving it stays smooth) no misfires but speedo doesnt work its auto (unsure of trans in car but i believe it to be all stock everything) stalls at stops and when slowing down sometimes any i dea on what the issue may be? (has new iac,map) thank you
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