I have the 2 piece March system sold by TPIS. They do not include a belt, but tell you what to get with options of manufacturers. I also have the TPIS catback vetteboy (not trying to hijack), and my stock 85 (EM longtubes, magnaflow cat., stock head/cam) sounds a little too boaty for my liking...
When you re-install the tube runners, make sure you fit the lower runner to manifold bolts first, leave them loose, then attach the plenum, then tighten the runner to manifold bolts.
I'm with urleycay - I have to redo the intake manifold because I didn't use the right stuff, and it is leaking. Also, permatex makes an aerosol gasket remover which will probably help
Castrol high mileage did reduce my first start puff (and oil leak amounts) as compared to synthetic (mobil 1) - but it's only a bandaid, seals gotta be replaced.
I can give you a perspective from another vehicle - I went from Mobil 1 to Royal purple in my 06 dodge ram 4.7. It idles much more smooth with the R.P., and from the talk on the various dodge truck forums, the 4.7s & 5.7s are very finicky motors (oil, plugs, trans fluid level will make them run...
Man, no lie vettefan 87 - my buddy has a 97 saleen mustang with 11K that puffs WORSE than my vette. I told him that is gonna be his first repair when he comes to acknowledge it......he is in total denial.
62K on my 85, and same thing. Castrol high mileage dino oil helped quell the puff to a mild exhale, and only on initial start up of the day. It says it reconditons seals, which I didn't believe but thought I would try, and I concur with them. It reconditioned them enough for it to be barely...
When my 85 showed similar symptoms the antenna motor evetually got stuck running in the up position. I pulled the fuse so it is up with no motor running, but no power locks now - the corvette central upgrade kit is one of my winter projects.
Your ECM will read the values of the TPS & MAF at WOT, so it's something you probably shouldn't mess with. You can get the stocker rebuilt & bored to 52mm which may be more cost effective than a new unit.
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