Quote:
Originally Posted by Singleton
I believe that the driven gear and the drive gear tooth count of the SD remained the same as standard pontiac engines at 14 for each gear, just at a slightly different diameters
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Agree, Singleton. Read this again everyone:
"A larger distributor gear was intended as a solution to issues with camshaft gear wear in high-performance applications. Getting the distributor with the large gear to fit into the block required an oversize distributor hole (10). This was also a feature found on the 303, 366 and Ram Air V 400s. The standard production block's distributor hole is shown for reference (11)." The 303s were Trans Am engines, no real race miles. The Ram Air V engines never went into production. The 366 engines did run for a few races in the NASCAR series with one team, possible two teams.
Rather than utilize a new distributor core casting to accommodate the oversize gear, the SD distributor was fitted with a sleeve. Accordingly, the corresponding cam shaft gear was undersized to match."
I believe the quoted statement in the first paragraph quoted implies this.
a) Dyno testing with the standard sized camshaft gear and the 80 psi oil pump potentially caused durability testing issues on the engines required to prove 50,000 durability on the track for emissions testing.
(Gear wear, the timing on the distributor changes, the emissions numbers change, not good for certification of the 455 SD engines).
So how many actual miles do you have on your GTOs with the 80 psi pump and drive gear system, Formulajones, that you drive daily?
Tom V.
ps Nice meeting you too Susie Q. Have fun with your car.