Need a compact alternator - 496 manifolds on 454 Mag

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08-06-2015 | 01:36 PM

#11

TomZ

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From: Virginia Beach

Quote:

Originally Posted by apollard

I'm surprised, as I have 496 manifolds on a Mark IV block and had no issues putting a full size 10SI alt on using stock brackets. Had to do a little grinding for PS pump, but got it to work also.

What gen block is yours?

It's a MK IV. My 496 manifolds are the older style with the separate water rail. The clearance issues are at the water rail casting.

I'll measure the 10SI that I have in the garage. If it's even a half inch shallower front to back, I'll just order a replacement. I have the factory Prestolite on it now.

08-06-2015 | 01:37 PM

#12

TomZ

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From: Virginia Beach

Quote:

Originally Posted by BUP

I was going by the ad as it says marine as well - that is for the buyer to completely to do the homework to find out if they are coast guard approved and spark resistance. I throw it up as I seen them before listing as marine.

Was just pointing it out in case someone else wanted to use the info. Thanks again for the direction!

08-06-2015 | 06:23 PM

#13

apollard

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Quote:

Originally Posted by TomZ

Ah, that must be it. Mine don't have the rail.

08-06-2015 | 06:36 PM

#14

BUP

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From: Ft. Worth TX

he should have the Aluminum manifolds version then with the rail - correct ?

08-06-2015 | 09:33 PM

#15

apollard

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Yes, at least As I understand the 496 manifolds

08-07-2015 | 07:42 AM

#16

TomZ

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Yes, they are the aluminum version.

08-07-2015 | 10:21 AM

#17

TomZ

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I went ahead and bought the IMCO relocation bracket that was on eBay. My alternator was working fine, and I figure it's better to just go with the easy fix. Lots of these things have popped up, and I'm happy to have found a simple solution.

Thanks for the direction everyone! That's what I love about this forum... lots of good support!

08-31-2015 | 11:04 AM

#18

TomZ

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From: Virginia Beach

Anyone got any more advice? I bought the IMCO relocation bracket that was referenced... no joy. Fitment is even worse now.

Has anyone had any luck with running 1-wire alternators vs the 3-wire? I might be able to make a Delco 10si alternator work.

08-31-2015 | 11:20 AM

#19

apollard

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You can buy the 10si based marine alts in a 3 wire version. I run one. I would stick with the 3 wire instead of the 1 wire. Best explanation I've seen for this here http://www.madelectrical.com/electri...hreewire.shtml