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Old 07-09-2018, 05:24 PM   #1
dirtfarmer22-250
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Will It Hook Or Did I Build A Drift Rig?

I done some trading last winter and ended up with a fresh rebuilt 71 model 454. I don't know much about the motor except it's got domed pistons a aluminum intake, and a 850 holley on it. It has 049 heads that looked like they came from the machine shop yesterday. I had it running on a stand and water leak around the valve stem seals so I pulled that head off and had it fixed. That's when I saw the domed pistons. The cam has a really steep ramp. I used the Kwik Performance serpentine belt set up. Got it put together and it sounds amazing. Instant throttle response.

All that said, the truck I put it in is a RCSB 91 GMC. A fresh 350 trans with a shift kit and stock converter (for now). Right now it's single tracked with I think a 373 gear. What am I going to have to do to get it to hook up? I don't plan on taking it to the track but I would like to bust on a Mustang or 2. I'm use to messing with 64 to 72 chevy truck and they hook pretty good on drag radials but this is a new deal for me.

Sorry I kinda rambled on there. Any suggestions, tips, tricks greatly appreciated. Thanks in advance..
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Old 07-09-2018, 06:25 PM   #2
weq92f
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Re: Will It Hook Or Did I Build A Drift Rig?

A posi would help! LOL.

Those domes are not unusual with #049 open chamber heads, even the semi closed chambers have domes sometimes. That thing could have compression anywhere from 8.5:1 up to 11:1 depending on everything else inside it.

Drive it like you stole it!

-klb
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Old 07-09-2018, 06:59 PM   #3
dirtfarmer22-250
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Re: Will It Hook Or Did I Build A Drift Rig?

That's the plan. I got the motor for next to nothing so it should be fun for a while. Who know's, it may be more than I'm expecting. I've got my eye on a 427 just down the road from me too.
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Old 07-10-2018, 12:15 AM   #4
Captainfab
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Re: Will It Hook Or Did I Build A Drift Rig?

It sounds to me like you may need a stall converter, depending on the specs of the cam.

With a leaf spring rear, you are going to have to address spring wrap and wheel hop. A set of Cal Trac bars will help with that. And of course the afore mentioned posi unit.
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Old 07-10-2018, 12:58 PM   #5
dirtfarmer22-250
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Re: Will It Hook Or Did I Build A Drift Rig?

That's the direction I was heading. Already started looking at posi units and was wondering if there was a specific GM truck to be looking for to find one or just buy new? A friend of mine has a wrecked 94 4wd diesel and I believe it's a 1/2 ton, I'll have to look at it again though. Would it be worth taking the cover off to check or should I go another direction. I know a 3/4 ton isn't for me.
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Old 07-10-2018, 11:32 PM   #6
Captainfab
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Re: Will It Hook Or Did I Build A Drift Rig?

To my knowledge the only factory posi available in a '88-'98 1/2 ton is the Gov Loc AKA Gov Bomb. I wouldn't waste my time with one with what you are doing. That '94 4x4 may have the 9.5" 14 bolt, but it will be 6 lug. That would be a step up from the 8.5" 10 bolt that is likely under your truck. You would just have to source some 5 lug conversion axles for it. The early '90's 454 SS trucks had the 9.5" 14 bolt.
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Last edited by Captainfab; 07-10-2018 at 11:37 PM.
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Old 07-12-2018, 09:48 AM   #7
dirtfarmer22-250
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Re: Will It Hook Or Did I Build A Drift Rig?

Is there a easy way to tell what the 14 bolt is or do I have to tear it apart to see what it is? If it's the one I need, I'll have the axles filled and drilled. I had a mopar 8 3/4 done a few year ago and it worked really good for me.
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Old 07-13-2018, 12:14 AM   #8
Captainfab
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Re: Will It Hook Or Did I Build A Drift Rig?

It is really easy to just pull the cover and see what it inside.
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Old 07-13-2018, 01:19 PM   #9
DieselSJ
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Re: Will It Hook Or Did I Build A Drift Rig?

Quote:
Originally Posted by dirtfarmer22-250 View Post
Is there a easy way to tell what the 14 bolt is or do I have to tear it apart to see what it is? If it's the one I need, I'll have the axles filled and drilled. I had a mopar 8 3/4 done a few year ago and it worked really good for me.
Look at the cover.

9.5" -


10.5"
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Old 07-13-2018, 02:00 PM   #10
dirtfarmer22-250
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Re: Will It Hook Or Did I Build A Drift Rig?

Thanks for the info and pics. I'll check that out this afternoon.
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