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Re: 283/302 small block installation
Jim Sears #1238432 Mon Oct 09 2017 04:12 AM
Joined: Feb 2004
Posts: 21,912
H
Boltergeist
Modify the bellhousing crossmember, but don't remove it altogether. It also serves as a brace for the rear spring pivots and there will be some nasty flexing of the frame if it's not there. A better way to handle the transmission clearance problem is to fabricate a bolt-in center section that drops a couple of inches to make room for the torque converter housing.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 283/302 small block installation
Jim Sears #1238459 Mon Oct 09 2017 01:45 PM
Joined: Jan 2013
Posts: 1,426
J
Shop Shark
I could have phrased that better. The bell housing cross member is not now nor would be later used For Mounts.
Right now the transmission clears it by fractions of an inch. moving the engine/transmission assembly forward would actually make it better.

Re: 283/302 small block installation
Jim Sears #1238472 Mon Oct 09 2017 02:48 PM
Joined: May 2005
Posts: 9,147
G
.
The original bellhousing cross member added considerable stiffness to the frame at the rear spring hangers. With our without any mounts it it's a good idea to have a cross member at the front spring rear most hangers.

GMC 400 series didn't have the same cross member and engine mounts as the smaller trucks, instead they used a large U shaped channel iron bolted outside the frame just behind the spring hangers.
See attached pictures of this 400 series cross member adapted to a smaller 2 ton GMC. I can't find a picture of one as fit originally in the 400 series GMC.

Attached Files
IMG_20130821_194213_610-001.jpg (2.54 MB, 35 downloads)
IMG_20130902_123704_492.jpg (1.76 MB, 21 downloads)

1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 283/302 small block installation
Jim Sears #1238505 Mon Oct 09 2017 05:02 PM
Joined: Feb 2004
Posts: 21,912
H
Boltergeist
Originally Posted by Jim Sears
As far as power goes, the client isn't going to be happy until we have 327 with 300 - 325 HP, so I'm resigned to that. At least it will bolt up to the 700R4.


I've been in your shoes many times- - - -dealing with a demanding customer who has no idea what he's asking for, or if the resulting project is going to do what he wants it to do. Putting a hotrod V8 in a situation more suitable for a low RPM high torque inline six is a really good example of that kind of thinking. It seems your guy would be better off with a 292 with a few torque-improving modifications than any other option, but explaining the facts of life to a customer with his mind already made up is an exercise in futility!
Jerry



The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 283/302 small block installation
Jim Sears #1238871 Wed Oct 11 2017 09:34 PM
Joined: Jan 2013
Posts: 1,671
S
Shop Shark
Guy in facebook in the Chev GMC 47-54 forum has a 305cu in V6 just pulled out of his truck runs great $500. Not a bad way to go either IMHO


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: 283/302 small block installation
sstock #1238956 Thu Oct 12 2017 03:34 PM
Joined: Jan 2013
Posts: 1,426
J
Shop Shark
That's in interesting idea.
I believe, however , the decision has been made. The client is ordering a 325hp, 327 crate engine.

Re: 283/302 small block installation
Jim Sears #1238958 Thu Oct 12 2017 03:59 PM
Joined: Feb 2004
Posts: 21,912
H
Boltergeist
I hope he's got enough gears to keep it wound up all the time. That HP happens only at wide open throttle, high RPM, and the torque band is very narrow. He's putting a Kentucky Derby thoroughbred in a mule pulling contest!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 283/302 small block installation
Jim Sears #1238967 Thu Oct 12 2017 04:56 PM
Joined: Mar 2010
Posts: 9,524
5
Master Gabster
The customer is always right. Uninformed, hard-headed, stubborn yes, but still always right.
Good call on your part for having your client purchase the crate motor that HE wants. Its all on him now.

Re: 283/302 small block installation
Jim Sears #1239026 Fri Oct 13 2017 04:22 AM
Joined: Jan 2013
Posts: 1,426
J
Shop Shark
True about the power curve. It will probably put out 200 in the normal driving range, twice what he has now and all the truck needs anyway.

Re: 283/302 small block installation
Jim Sears #1239086 Fri Oct 13 2017 04:42 PM
Joined: Feb 2004
Posts: 21,912
H
Boltergeist
Build the drivetrain strong enough to survive when somebody winds it up and bang-shifts into the next higher gear with a heavy load onboard. A machinist friend had a piece of 4" driveshaft tubing hung up over his lathe with 3 full turns twisted into it after a driver revved up a 425 HP Caterpillar 3406 Diesel and sidestepped the clutch- - - - -with the fully-loaded rig buried up to the hubs in a muddy rice field! The shaft looked like an hourglass!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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