427 ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

special70gmc · 11-25-2002, 08:59 PM

what mods would i have to do to mount a 427 in our trucks i got a 67 427 435hp block im gonna build its 11-1 compression and stock crank also will this be a good moter for the truck. one more thing will it bolt to a th-350?

should be fast

mikep · 11-25-2002, 09:22 PM

It'll bolt up and it will probably go pretty well. . 427 would be my first choice for a big block in a car where'd I'd want to wind it up but I think for a truck where your'e trying to push a lot of weight with a butt load of torque you might want to think about picking up a 454 crank, damper and flexplate. The 427 will go like stink but you'd really be surprised how much more grunt the 454 has down low in the same sized package.

**Desert Rat** · 11-25-2002, 09:46 PM

If you have a REAL 435hp motor,do you have the tripower setup with air cleaners,and linkage also?If so sell it all and go buy a 502,id sell it to someone with a vette and build a nasty 454 and have cash left over to buid a killer tranny and.....

chevy2racr · 11-25-2002, 11:46 PM

uh, did someone say a 454 has more lugging power??? what 2 ton trucks have 454's? none man, 427's you can cam them to lugg hard as hell down around 700RPM

Leinie · 11-26-2002, 12:01 AM

That's not the same 427. Trucks use the tall deck 427, it's not a as good of a build up motor as a regular big block- Way to much internal rotating mass to wind up quickly. You're right - it's a torque monster.

mikep · 11-26-2002, 12:32 AM

Yep ... Big Truck 427 is a different motor. Same basic engine as the passenger 427 but teenie weenie ports and different configuration on the pistons with a tall deck block. Good for low end torque but thats about it . They can be made into real motors but it takes some real cash and some real obstinence.

The Corvette 435 HP 427 L88 ( almost the same in L-78 but single 4 bbl if I am not mistaken ) is a rectangular port 4 bolt main big block with a steel crank, 7/16" bolt rods , 11:1 forged pistons , overly big solid lifter cam and originally a 3 - 2 barrel induction setup although my guess would be that over 3/4 of the guys out there who think they have 435 horse 427 L88's's actually have 265 horse passenger car 427's ( or 396's for that matter ).

Longhorn Man · 11-26-2002, 12:36 AM

As for what mods are needed...just big block motor mount towers and assorted big block items like fan shroud and stuff.
As for a TH350...it'll bolt up and work...for a while. Look into a TH400.
Make sure you are not dealing with an industrial 427...the truck tall deck engine. These motors are awsome for mountian motor build ups....but you'll have to re mortgage your house to do it.

chevy2racr · 11-26-2002, 03:28 PM

I know they are differnt but still the same concept, you can put a cam for a truck 427 in a passenger 427and still have butt loads of torque at 700 rpm. Sorry, I just gotta be the smart ass around here. I will say this though, my 454 in my truck gets my ass goin quick, and I've had her cruisin at 90 a few times, 3.73 rear with th350. and I've towed with it...

tom hand · 11-26-2002, 08:11 PM

I don't think the extra 27 inches in a 454 would buy you anything. If you got a 427 bolt it in. You're only problem will be traction.

**Desert Rat** · 11-27-2002, 01:57 AM

427 a sweet motor but sell it since they have the magical numbers build a 468 with more power and have money left over.any big block isnt reaslly made for 7000 rpm screaming.11 to 1 compression,not a good one for the street get brute torque on a pump gas motor.

mikep · 11-27-2002, 02:48 AM

Not only that but if it is a 435 HP big block and you have the original heads on it you'll be one miserable MOFO driving it around in a truck. Ever driven rectangular port BBC heads? I hope your not doing anything until you hit 4500 RPM because your heads sure as hell wont be doing anything. After that hold on tight but the low end torque is simply not there. A decent set of open chamber oval ports will be a lot more fun to drive in the real world. My dad used to have a set of the L88 heads on a 12.5:1 compression 468 in a 67 Camaro . It was a mid 11 second car that should have been a mid 10 second car but it never really started to pull until 50MPH or so. Ran through the traps at 120 or so but the ET should have been better given the total lack of wheel spin. That is one thing huge ports are good for though. You get so little bottom end theres no chance of spinning the tires off the line. Good oval ports with a bit of bowl work will carry you well into 6500 RPM range which is as fast as its fun to go in a big block anyway.

firstgencamaros · 11-27-2002, 03:09 AM

If you can get a 427 together for your truck. I say drop that bad boy in there. It'll run like a raped ape!

guitarman · 11-27-2002, 09:07 AM

I'm running squareport heads on a .030 over 454 and I'm not having any low end torque problems. If I had any more torque all I would do is boil the tires.

texnician01 · 11-27-2002, 11:32 AM

427 is also the largest that the EPA will allow in the big trucks. One of our firetrucks, our main pumper has a 427 drive motor cause that is all the larger we could go but the pump has a 454 the truck is a dog but that is because of the Allison automatic behind the 427. our neighbor dept. has the same truck but with a manual, it'll get right up and go.

special70gmc · 11-27-2002, 12:15 PM

its a short block no heads but it has the tripower manifold i woulnt buy square ports ive herd the same about them

palallin · 11-27-2002, 05:07 PM

It won't work at all in your truck. Best just give it to me: I'll dispose of it for you. . . .

11-25-2002, 08:59 PM	#1
special70gmc Registered User Join Date: Sep 2002 Location: long island, new york Posts: 1,333	427 ? what mods would i have to do to mount a 427 in our trucks i got a 67 427 435hp block im gonna build its 11-1 compression and stock crank also will this be a good moter for the truck. one more thing will it bolt to a th-350? should be fast __________________ 1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door

11-25-2002, 09:22 PM	#2
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	It'll bolt up and it will probably go pretty well. . 427 would be my first choice for a big block in a car where'd I'd want to wind it up but I think for a truck where your'e trying to push a lot of weight with a butt load of torque you might want to think about picking up a 454 crank, damper and flexplate. The 427 will go like stink but you'd really be surprised how much more grunt the 454 has down low in the same sized package. __________________ No truck :-(

11-25-2002, 11:46 PM	#4
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	uh, did someone say a 454 has more lugging power??? what 2 ton trucks have 454's? none man, 427's you can cam them to lugg hard as hell down around 700RPM __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

11-26-2002, 12:32 AM	#6
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Yep ... Big Truck 427 is a different motor. Same basic engine as the passenger 427 but teenie weenie ports and different configuration on the pistons with a tall deck block. Good for low end torque but thats about it . They can be made into real motors but it takes some real cash and some real obstinence. The Corvette 435 HP 427 L88 ( almost the same in L-78 but single 4 bbl if I am not mistaken ) is a rectangular port 4 bolt main big block with a steel crank, 7/16" bolt rods , 11:1 forged pistons , overly big solid lifter cam and originally a 3 - 2 barrel induction setup although my guess would be that over 3/4 of the guys out there who think they have 435 horse 427 L88's's actually have 265 horse passenger car 427's ( or 396's for that matter ). __________________ No truck :-(

11-26-2002, 03:28 PM	#8
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	I know they are differnt but still the same concept, you can put a cam for a truck 427 in a passenger 427and still have butt loads of torque at 700 rpm. Sorry, I just gotta be the smart ass around here. I will say this though, my 454 in my truck gets my ass goin quick, and I've had her cruisin at 90 a few times, 3.73 rear with th350. and I've towed with it... __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

11-25-2002, 09:46 PM	#3
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	If you have a REAL 435hp motor,do you have the tripower setup with air cleaners,and linkage also?If so sell it all and go buy a 502,id sell it to someone with a vette and build a nasty 454 and have cash left over to buid a killer tranny and.....

11-26-2002, 12:01 AM	#5
Leinie Registered User Join Date: Feb 2001 Location: USA Posts: 2,613	That's not the same 427. Trucks use the tall deck 427, it's not a as good of a build up motor as a regular big block- Way to much internal rotating mass to wind up quickly. You're right - it's a torque monster.

11-26-2002, 12:36 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	As for what mods are needed...just big block motor mount towers and assorted big block items like fan shroud and stuff. As for a TH350...it'll bolt up and work...for a while. Look into a TH400. Make sure you are not dealing with an industrial 427...the truck tall deck engine. These motors are awsome for mountian motor build ups....but you'll have to re mortgage your house to do it.

11-26-2002, 08:11 PM	#9
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	I don't think the extra 27 inches in a 454 would buy you anything. If you got a 427 bolt it in. You're only problem will be traction. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

11-27-2002, 01:57 AM	#10
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	427 a sweet motor but sell it since they have the magical numbers build a 468 with more power and have money left over.any big block isnt reaslly made for 7000 rpm screaming.11 to 1 compression,not a good one for the street get brute torque on a pump gas motor.

11-27-2002, 02:48 AM	#11
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Not only that but if it is a 435 HP big block and you have the original heads on it you'll be one miserable MOFO driving it around in a truck. Ever driven rectangular port BBC heads? I hope your not doing anything until you hit 4500 RPM because your heads sure as hell wont be doing anything. After that hold on tight but the low end torque is simply not there. A decent set of open chamber oval ports will be a lot more fun to drive in the real world. My dad used to have a set of the L88 heads on a 12.5:1 compression 468 in a 67 Camaro . It was a mid 11 second car that should have been a mid 10 second car but it never really started to pull until 50MPH or so. Ran through the traps at 120 or so but the ET should have been better given the total lack of wheel spin. That is one thing huge ports are good for though. You get so little bottom end theres no chance of spinning the tires off the line. Good oval ports with a bit of bowl work will carry you well into 6500 RPM range which is as fast as its fun to go in a big block anyway. __________________ No truck :-(

11-27-2002, 03:09 AM	#12
firstgencamaros Registered User Join Date: Sep 2002 Location: Gilbert, AZ Posts: 151	If you can get a 427 together for your truck. I say drop that bad boy in there. It'll run like a raped ape! __________________ FGC

11-27-2002, 09:07 AM	#13
guitarman Do it well or don't do it Join Date: Apr 2002 Location: Georgia Posts: 457	I'm running squareport heads on a .030 over 454 and I'm not having any low end torque problems. If I had any more torque all I would do is boil the tires. __________________ Try to be the person your dog thinks you are. Excellent paint and body site: http://www.autobody101.com/ Visit my Web Site http://home.attbi.com/~agfosteriii

11-27-2002, 11:32 AM	#14
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	427 is also the largest that the EPA will allow in the big trucks. One of our firetrucks, our main pumper has a 427 drive motor cause that is all the larger we could go but the pump has a 454 the truck is a dog but that is because of the Allison automatic behind the 427. our neighbor dept. has the same truck but with a manual, it'll get right up and go. __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

11-27-2002, 12:15 PM	#15
special70gmc Registered User Join Date: Sep 2002 Location: long island, new york Posts: 1,333	its a short block no heads but it has the tripower manifold i woulnt buy square ports ive herd the same about them __________________ 1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door



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11-27-2002, 05:07 PM	#16
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,238	It won't work at all in your truck. Best just give it to me: I'll dispose of it for you. . . . __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

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