I am installing a TPIS ZZ-9 Camshaft in an 88 GTA 5.7L. The engine was rebuilt about three years ago. The motor is apart now and to my dismay I discovered that the block did not come w/ a roller cam and roller lifters. I figure that the engine shop tried to save some money on the rebuild considering that I only paid $1,800 for the replacement long block. This block though was originally made for a roller cam. I have already installed the lifter valley spider, tappet link bars, hydraulic roller lifters, and shorter pushrods from GM. Everything fit and bolted right in. The ZZ-9 Camshaft and valve springs are also installed. The only problem I have now is that the thrust plate for the cam doesn't fit the block. This is installed in front of the cam onto the block right behind the cam timing gear to keep it from walking forward. The bolt pattern is further apart on the block than it is on the thrust plate. I would like to know if there is another thrust plate that I could order from GM. Were there two types of thrust plates used? I thought of drilling out the present thrust plate but I am hesitant. I am worried that that the center of the thrust plate might not be centered with the new camshaft. I would rather have something bolt right in. Has anyone had a situation like this? Any help will be truly thankful.

Joe

 

Are you using the same thrust plate that was on the standard cam? I'm not sure, but I would assume there would be a difference. You can probably pick up the right one from GM.

good luck,


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87 IROC-Z, 5.7, auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, SLP .218/.224 .495/.502 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback. Coming Soon(?)- Fasttrack/Accell DFI

1989 Pontiac 20th Anniversary Turbo Trans Am - 160,000 miles, K&N filter

 

Yes, there are two parts. -88 and -91 blocks have the holes on different location. I built a TPI engine out of a -88 truck block with -91 parts. You can order the plate from your GM dealer, I could, and I live in Finland ! Sorry, no numbers. Claus

 

Yes, what C1500 said. Gm used two different sizes. I just ran into that problem istalling a LT$ hot cam, but mine was too small If you order the single roller timing chain kit, it comes with both plates and bolts. If you're swapping from flat tappet to roller, you're going to need a timing chain anyway.

12371043 Timing Chain Kit "Single Roller Design" $42.14

later,


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Bob '89 Formula CC350
Last(lost)Member of the Elusive Great Lakes Crew
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