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Old 08-11-2013, 07:50 PM
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I was unaware of that, rear is out of a 95 6 speed z, guy I got it from told me 355s so I'm guessing they're 342s? I was thinking of going xe262 with 1.6 rockers but I know the stock heads don't flow well, I've never done any port work..

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Old 08-11-2013, 07:53 PM
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I just know silvolite flat tops, .28 gaskets...I'm guessing 9:5:1 cr...
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Old 08-11-2013, 08:22 PM
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Originally Posted by deadbird101 View Post
I just know silvolite flat tops, .28 gaskets...I'm guessing 9:5:1 cr...
I would definitely ask the builder,becuz,IIRC,& sometimes I don't,the Silv-o-Lite's only come in a 1.54 compression hgt.If the block hasn't been decked any & they use a .028 gasket,your piston could be .073 in the hole.Even @ 0 deck,you'll be .048.
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Old 08-11-2013, 08:27 PM
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Originally Posted by F-BIRD'88 View Post
Best check the axle ratio as a 3.55:1 ratio does not exist for the 7.5" rear.
factory for that car is 3.23. Optional is 3.73. Most are 3.23:1 (5 speed)

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rear gears for most 80's 3rd gen f bodys are 3.23 and 3.42
don't remember 3.73 ever being offered until you got into the firehawk
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Old 08-12-2013, 08:06 AM
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O/P
is your 305 roller compatible block?
not sure if the 86 was or not.. maybe someone (F-BIRD88) CAN TELL YOU ,if so I'd run a roller as it's cheaper to save now than to loose a lobe..

the 85/86 305ho with carb has a blower motor and duct work to blow on the carb to keep vapor lock/boiling the fuel at bay.. make sure you have this.. as the cars engine bay is cramped and even the hood with 4 vents(two at nose and two at back sides) don't help enough when parked..
my 86 when the relay went would take forever to start because the fuel boiled out..
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Old 08-12-2013, 08:12 AM
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I have a 4 inch cowl hood for it, and the a/c is all gone, will I still need it? Would I have to do the same ammpunt of head work for the xe256? How much would the vortec heads have to be milled?
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Old 08-12-2013, 08:48 AM
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I have a 4 inch cowl hood for it, and the a/c is all gone, will I still need it?
no,
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