I have a stock L98 block .039 Head gaskets, stock GM Lifters comp cam 218/224 498/502 112 LSA,GM performance parts 1.6 RR's, and trick flow 23*'s. I'm looking at the pushrod recomendations but not one of the options pertains to me. Thanks Also any name brand that is good? Also should i go with guide plates or self aligning? I stil have to go with narrow rockers because I'm using my centerblot covers.

 

Call Summit up and tell them your combo. I know you'd be better off using the guideplates that come with the trickflows and regular rockers. As for length, Summit will hook you up. Your stock pushrods will prolly work fine, you need to check the geometry anyway to be sure.

 

Mkos,

With stock heads and that cam, you would probably need +.100" push rods. If the stud positions on the TF heads are relatively stock, and your valves are stock length, that should be close.

If you call Summit (or whoever) make sure you include the depth that you machined the stud bosses, the valve spring installed height, deck height, and valve stem lengths with all the other info you've presented here. Even with the estimated lengths they may give you, you should always check valve train geometry with an assembled pair of valves (you don't need to torque the heads down) to make sure you have proper clearances.

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Later,
Vader
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Justice and Freedom will Prevail
Adobe Acrobat Reader

 

I have a similar combination (355 with TF 23* heads, LT4 HOT cam, and CompCams ProMagnum 1.6 roller rockers) and I bought the stock-length Trick Flow chrome-moly pushrods (part number 21407200). I checked the movement of the rocker tip on the end of the valve and it was almost perfect. I installed the guideplates that came with the TF heads since the roller rockers I used are non-self-aligning. You don't necessarily need the narrow-body rockers since the ProMags fit if you trim the support braces under the valve covers.

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Greg Westphal
'87 IROC 355TPI/A4