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Old 04-20-2005, 01:33 PM
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Indmar Tune-Up/Timing Procedures

The attached is something that some of you might find useful. It contains Tune-up and Timing procedures for Indmar Marinized Ford and GM engines through the 2005 Model Year. I hope thr PDF attachment works. This is the first time I have tried making an attachment.
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Old 04-20-2005, 01:40 PM
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Old 04-20-2005, 01:42 PM
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Old 05-15-2005, 03:01 PM
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Thanks EngineNut

I needed that...just have to fiqure out if my 93 Prostar 351 (285 HP) is considered standard or HO.

Wes
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Old 05-15-2005, 03:08 PM
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I believe the 285 HP is the HO version.

Engine Nut- does Monty still work at Indmar? I had heard Matt left a couple of years ago, but have seen his handle on a couple of sites.
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Old 05-15-2005, 03:11 PM
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Thanks Jim,

Appreciate that


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Old 05-15-2005, 04:58 PM
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Quote:
Originally Posted by Wes
Thanks EngineNut

I needed that...just have to fiqure out if my 93 Prostar 351 (285 HP) is considered standard or HO.

Wes
The 285 is the HighOutput engine ... GT40 Heads and a higher performing cam and pistons.

Engine nut
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Old 05-16-2005, 09:09 AM
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Old 05-16-2005, 09:17 AM
jimmer2880 jimmer2880 is offline
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I'm cornfused....

In an earlier post - you stated:

"The switch over to GM Vortec heads came back in 95-96 model year era. The vortec heads allowed the engines to breathe more efficiently and resulted in a HP increase of approximately 40 HP. For example, the original Indmar TBI was approximately 275 HP, when the Vortec model came out, the HP bumped to closer to 315. You can easily tell if you have Vortec heads on a 5.7 by looking at the bolts that hold the intake manifold to the cylinder head. On a Vortec engine, there are 8 intake manifold bolts that go straight down into the head. A non-vortec engine has 12 intake manifold bolts that go in at an angle. "

Yesterday, I counted my intake bolts on my '95 PS190, Elect ignition (not a points convert either). I counted 12, meaning that i'm non-Vortec. However, your .pdf only states Vortec for any 5.7 that's electronic non-LT1.

Is there another way to tell if I'm Vortec or not? I'm starting to think I'm using shorter plugs than I should be?
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Old 05-16-2005, 09:28 AM
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I think I'm in the same boat. My '97 is a 275 HP non- HO electronic ignition, non-vortec...I think. I ordered new plugs from MYMC and they sent me the long ones, luckily I checked them against the ones I pulled out which were much shorter.

The only optional engine that year was the LT-1.
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