i plan on getting the trick flow 23 degree heads, but i have a couple of guestions , for anyone running these with a l98 block 1/ can i reuse the stock centerbolt vavle covers ? 2/ if i can use the stock covers, what if i got 1.6 rockers ? would i need taller vavle covers 3/ in summit they list the heads but say they reguire special push rods ?, or longer ones something like that cant remember, 4/ what does a 89 l98 have stock for sizes on pushrods , 3/8 or 7/16 well i guess thats all the guestion i have for now, if anyone could help , that would be great

I think I can help you. Im running the Trick Flow 23* heads for centerbolt valve covers. You can get them with the older perimiter style too.
If you run the Crane gold 1.6 rr (same as LT4 stock) they will bolt in with no problem. Im running Comp Cams pro magnium stanless steel rockers under my stock centerbolt valve covers, I just had to remove the "drip tabs"
As for your push rods, you will have to use hardened ones, beacuse the Trick Flows have guide plates, but the length is still the same as stock.
The stock size push rod if Im not mistaken is 3/8

I hope that helps

I'm running trick flows on my L98.
I'm using 3/8 Trick Flow pushrods 7.300
I'm running regular comp pro magnum rockers 1.6
I'm using Moroso centerbolt covers. Couldnt help you there.

I run TFS 23* heads:

1/ I am running stock Valve covers - unmodified.
2/ Crane Gold narrow-body 1.6:1 full roller rockers.
3/ I have TFS CM hardened pushrods, 7.300"
4/ stock L98 has 3/8" pushrods.