Should I get for my trick flow 23 heads ?

Jegs has these Crane Cams moly pushrods for 110 bucks that say "270-10621-16 5/16'' Stock Length, 88-95 with Factory Hydraulic Roller Lifters, Non-LT1, (Heat Treated)". I know Trick Flow says u need hardened pushrods for their guideplates. Do I also need new rockerarms or can I use the stock ones ? Thanx for any suggestions.

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92 Z28 5.7
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Ported stock heads, XR270HR-10 cam, TES headers
Crane AFPR, Flowmaster catback, MSD ignition
#24 SVO injectors, 1LE aluminum driveshaft.

Best ET 13.3@107 mph

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Those push rods will be OK; although that cam is big enough that you might want to go with .050" longer-than-stock ones (7.950" IIRC). It's right at the borderline for that.

Definitely get better rockers than the stamped stock crap!! Most stock rockers are barely over 1.4 ratio theoretical, and they bend so much that they give up even more lift than that. With as much effort and $$$ as you're putting together there, that's not a good place to short yourself. I'd suggest the Comp 1416 steel roller-tip ones, at a little less than $200 a set.

{edit} Oops, the length I gave you was for flat-tappet motors... ignore that dimension...

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"So many Mustangs, so little time..."
ICON Motorsports

[This message has been edited by RB83L69 (edited March 13, 2001).]

 

FWIW, I went with Trick Flow's pushrods, they're $84 per set, one piece hardened chromolly, chamfered ends. I currently am using p/n TFS 21407300 (7.300) for both cars, which have Crane 1.6 rr's. Stock lenght p/n is 21407200 (7.200), .050 longer would be p/n 21407250. Any change to ratio should require checking pushrod length, but I'll admit, I'm not familiar with the 23 deg TF heads actual setup. Summit stocks them.

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KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project

[This message has been edited by KevinP92Z (edited March 15, 2001).]

 

I talked to a few people in my car club and some of them were saying that the 1.25" springs that come with the heads are weak and I should have ordered the 1.47" springs. Now that I think about it, I should have gotten the 1.6 rockers and the bigger springs so I can get a little more lift. Did anyone hear bad things about the 1.25" springs... do they break as often as some people say ??

 

In the years I've had my TF twisted wedge heads (first generation tw heads), I never had a problem with the springs, but I do recall several saying they had problems with the K-Motion springs that TF apparently used in some of their earlier heads.

When I was finishing the 383, I had my TF heads machined for larger Crane double springs (1.46 dia).

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KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project