SLO 65

iTrader: (6)

I though I read somewhere (can't find it now) that the accessorries (Alt, P/S) for an F-body, Y-body, CTS-V, GTO, etc, will not bolt up to the Vortec block. I want to use a 4.8 or 5.3 for my swap but would like to use f-body accesorries. Is it just the iron block Vortec's, all Vortecs, or no Vortec's?

Nick

garys 68

iTrader: (1)

They'll fit. The only thing you'll have to do is drill and tap a boss on the iron block for the low mounted f body alternator bracket.

cutlass_455

iTrader: (2)

The 'car' stuff will bolt onto the 'truck' engines. The only real difference is the truck engines dont have a bolt hole boss drilled and tapped for a bolt to go into where on Fbody cars the one alternator bracket bolt goes into. Supposedly you dont NEED it, but Ive never tried it.

billsnogo

iTrader: (7)

These guys are right, and think this only applies to the f-body accessories. I bought a 6.0 lq4 thinking only the iron 5.3's were missing this hole. Wrong..... I need to drill and tap this hole too......

Pocket

iTrader: (22)

I wouldnt suggest running without the tapped hole. The iron blocks are actually down two bosses for the alt bracket out of 3 total. One has no material whatso ever, the other needs to be drilled out

I wouldnt mount an alt on one bolt

cutlass_455

iTrader: (2)

Hey, thanks for the extra info, I was unaware of the 'other' bolt. Good stuff.

slowpoke96z28

iTrader: (2)

well, there is one more bolt on the rear of the alternator. my biggest concern would be the serpentine belt. there is an idler on the bracket as well that i imagine wouldn't be able to do its job properly if that bracket wasn't solidly mounted.

Pocket

iTrader: (22)

A boss for the rear brace is present on the iron blocks. I figured it was a given

Spoolinsteve

Does anyone know the thread pitch of the hole you have to tap? There is alot of info here on tech about the missing hole but I am yet to find it.

Pocket

iTrader: (22)

11/32" drill

M10.1.5mm thread

Try to find a drill longer than the alt bracket is thick. Use the bracket as a guide. You absolutely DONT want this hole to be crooked. Punch the drill all the way through the boss and tap as deep as you can get without risking a broken tap

Steve VanS

iTrader: (1)

For Metric threads. the tap drill size is: subtract the pitch from the basic size, and you have the tap drill size. Examples:

M10x1.5, use 8.5mm tap drill
M6x1, use 5mm tap drill

If you are drilling and tapping by hand (hand drill & hand tap), use a drill a little smaller than the usual tap drill size, as drilling by hand usually produces an over size hole. For example, I would use an 8.25mm drill for an M10x1.5.

Spoolinsteve

Very Helpful guys! Thanks