Will It Hook Or Did I Build A Drift Rig? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dirtfarmer22-250 · 07-09-2018, 05:24 PM

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..

weq92f · 07-09-2018, 06:25 PM

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

dirtfarmer22-250 · 07-09-2018, 06:59 PM

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.

**Captainfab** · 07-10-2018, 12:15 AM

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.

dirtfarmer22-250 · 07-10-2018, 12:58 PM

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.

**Captainfab** · 07-10-2018, 11:32 PM

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.

dirtfarmer22-250 · 07-12-2018, 09:48 AM

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.

**Captainfab** · 07-13-2018, 12:14 AM

It is really easy to just pull the cover and see what it inside.

DieselSJ · 07-13-2018, 01:19 PM

Quote:

Originally Posted by dirtfarmer22-250

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"

dirtfarmer22-250 · 07-13-2018, 02:00 PM

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

07-09-2018, 05:24 PM	#1
dirtfarmer22-250 Registered User Join Date: Oct 2017 Location: Poplar Bluff Mo Posts: 21	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..

07-09-2018, 06:25 PM	#2
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 2,877	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 __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold

07-09-2018, 06:59 PM	#3
dirtfarmer22-250 Registered User Join Date: Oct 2017 Location: Poplar Bluff Mo Posts: 21	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.

07-10-2018, 12:15 AM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-10-2018, 12:58 PM	#5
dirtfarmer22-250 Registered User Join Date: Oct 2017 Location: Poplar Bluff Mo Posts: 21	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.

07-10-2018, 11:32 PM	#6
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 07-10-2018 at 11:37 PM.

07-12-2018, 09:48 AM	#7
dirtfarmer22-250 Registered User Join Date: Oct 2017 Location: Poplar Bluff Mo Posts: 21	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.

07-13-2018, 12:14 AM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

07-13-2018, 02:00 PM	#10
dirtfarmer22-250 Registered User Join Date: Oct 2017 Location: Poplar Bluff Mo Posts: 21	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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