The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 03-02-2018, 04:42 PM   #1
77GMCTruck
Registered User
 
Join Date: Sep 2007
Location: Birmingham, Alabama
Posts: 87
Looking for Opinions for Top End Kits

I have a 1977 GMC Sierra Classic 3/4 ton that has a 350 4 bolt main crate motor. I have just completed putting in a Monster 700R4 transmission.

What I am asking is what would you all recommend to build an engine with around 350 hp and 400 or more torque, or tell me what you all did for modifying your engines.

Thanks
77GMCTruck is offline   Reply With Quote
Old 03-02-2018, 05:53 PM   #2
B. W.
Senior Member
 
B. W.'s Avatar
 
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 949
Re: Looking for Opinions for Top End Kits

What crate motor do you have? Do you have the specs? Need to know compression ratio, what heads / cam / carb.
B. W. is offline   Reply With Quote
Old 03-02-2018, 07:42 PM   #3
tdangle
Senior Member
 
tdangle's Avatar
 
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 355
Re: Looking for Opinions for Top End Kits

I am going to guess you have pretty much a stock 350 smog motor of that era. Probably around 160-180 HP with 8.0 to 1 compression heads.

I would look at the edelbrock top end kit. cam, heads pretty much everything you need. All setup to work together and give you a much needed boost in HP. That is assuming your bottom end is in good shape.
__________________
Terry

1970 C20 Custom Camper, 350/2004R, Dana 60 4.10, factory AC, side tool box, wood bed floor. Has been in the family since new.
tdangle is offline   Reply With Quote
Old 03-02-2018, 09:38 PM   #4
77GMCTruck
Registered User
 
Join Date: Sep 2007
Location: Birmingham, Alabama
Posts: 87
Re: Looking for Opinions for Top End Kits

My stepfather bought it before he passed away. I think it is a little better than stock on the horsepower but I do know it is a 0101 block that, according to my mechanic friend most people are looking for to build race engines with. He said I could put a blower on it with the right internals but I don't want to go that far.

I have a classic muscle car that I plan on building for something like that. Just looking for something around 300 + HP and around 400 TQ to use for towing.
77GMCTruck is offline   Reply With Quote
Old 03-02-2018, 10:17 PM   #5
ElKotze
Registered User
 
ElKotze's Avatar
 
Join Date: Nov 2014
Location: Southwest Kansas
Posts: 266
Re: Looking for Opinions for Top End Kits

The Edelbrock heads are designed after the Vortec heads, can't go wrong with that, plus, everything works together and you can run a nice cam with it. Should wake it up quite a bit.
__________________
'64 C10 LWB, 283, 5speed
'68 C10 LWB, 350, 4speed
'69 C20 Custom Camper Longhorn, 350, 4speed
'72 C20 Cheyenne Super
ElKotze is offline   Reply With Quote
Old 03-03-2018, 12:48 AM   #6
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 21,365
Re: Looking for Opinions for Top End Kits

You need a little more info on the engine such as what pistons are in it. Are they dished or flat tops? The 3970010 block is one of the most common GEN I 350 blocks and not all have 4 bolt mains. Not that, that makes any difference for what you are doing, just saying. The Edelbrock Performer top end kit should get you the power goals you are looking for and be towing friendly, but the kits don't come cheap.
__________________
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
Captainfab is offline   Reply With Quote
Old 03-03-2018, 07:43 AM   #7
77GMCTruck
Registered User
 
Join Date: Sep 2007
Location: Birmingham, Alabama
Posts: 87
Re: Looking for Opinions for Top End Kits

Thanks for the suggestions. I believe I have the paperwork for the engine in the truck but it is at my friends shop having the 700R4 put in currently. Cost is some concern but I really want a good quality package so I don't mind spending extra to get it. I will check out the Edelbrock Top End Kits and if I find the paperwork on the engine I'll post it here. I think it is the one with 260 HP. I know the original engine was only 190 HP.

Thanks again for the help.
77GMCTruck is offline   Reply With Quote
Old 03-06-2018, 04:51 PM   #8
mattfranklin
Registered User
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 468
Re: Looking for Opinions for Top End Kits

Here I go again recommending that everyone watches "Engine Masters" episodes. They show real dyno testing with real combinations.
https://www.youtube.com/watch?v=f7mvgf6_p1g
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340
mattfranklin is offline   Reply With Quote
Old 03-06-2018, 08:05 PM   #9
B. W.
Senior Member
 
B. W.'s Avatar
 
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 949
Re: Looking for Opinions for Top End Kits

Matt, I hadn't watched any of them until you posted the one on rocker arms ( I think?) Since then I've watched them all! Looks like they have lots of fun!
B. W. is offline   Reply With Quote
Old 03-07-2018, 04:30 PM   #10
mattfranklin
Registered User
 
mattfranklin's Avatar
 
Join Date: Dec 2011
Location: Moraga, CA
Posts: 468
Re: Looking for Opinions for Top End Kits

Quote:
Originally Posted by B. W. View Post
Matt, I hadn't watched any of them until you posted the one on rocker arms ( I think?) Since then I've watched them all! Looks like they have lots of fun!
Glad you liked it. I love the data they provide. Reminds me of the good old days when Hot Rod and Car Craft would do dozens of dyno runs on the old $1000 "Targetmaster" GM crate motors, adding different combinations of carb, cam, headers, and so on and providing Hp and Tq charts for all of the combos.
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1

http://67-72chevytrucks.com/vboard/s...d.php?t=567340
mattfranklin is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:17 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com