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Old 12-08-2009, 09:24 PM
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mid 80 sb chevy question

I got a chance to pickup a mid 80's 350 4 bolt amin motor out of a truck. My question is this, other than the 4 bolt main versus the 2 bolt main is there any difference on a truck motor with regards to parts and fitments. Are the heads the same? What tranny's will mate up? It going in an f1 pickup project. I wanted to run a 4 speed behind it. Any problems there? If I go automatic, 700 r4, th350?? Any help is appreciated! Thanks.

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Old 12-09-2009, 12:15 AM
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No differnce at all....2 bolt/4 bolt, you may have some brackets or mounts that are truck specific but any Chevy trans.......stick or auto will bolt up. The 4 spd will be sweet, just make sure you get the right combo of parts to match up, buy everything from the same mfg. if possible so theres no mistake.
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Old 12-09-2009, 04:01 PM
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Depends on the year and original destination. Some truck heads use a 1.72" intake valve. Most have 3/8" exhaust valve stems, insert valve seats. The acc holes are drilled 7/16" on some models. The dip stick is on either side.
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Old 12-09-2009, 04:42 PM
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Thanks guys. Is that mid 80's motor or solid one or would it be better to stay with an older (heavier casting?) motor from the 70's? Can I use the newer 5 speed manual trans? Does the truck bellhousing accept like a muncie 4 speed? Thanks again in advance for any help.
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Old 12-09-2009, 04:58 PM
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The big hole on the truck bellhouse is larger than the car/Mnucie, by about 1/4". Was told that this is not acceptable by a good tranny guy. You can buy one for about $40??
Everything else is OK.
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Old 12-09-2009, 06:27 PM
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Thanks for the info. I think I got a handle on it now.
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Old 12-09-2009, 08:32 PM
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Quote:
Originally Posted by ronbo
The big hole on the truck bellhouse is larger than the car/Mnucie, by about 1/4". Was told that this is not acceptable by a good tranny guy. You can buy one for about $40??
Everything else is OK.
A couple more options on the big hole in the truck bellhousing

McLeod makes a spacer ring that goes around the bearing retainer on the trans----however, this requires machining a lip on the back of the retainer to hold the ring in place.

Somebody is now making bearing retainers for Muncie trans for the truck bellhousing---Cannot recall who---Will have to go to
Team Chevelle----- http://www.chevelles.com/forums/index.php
or
Chevy Talk-------- http://www.chevytalk.org/fusionbb/index.php?

Find posts or threads by: DZAuto

621 bellhousings (11" clutch), are much more pricey than the smaller bellhousings (10.4" clutch) for the passenger car transmissions.

I am using an 86/7 Chev truck bell with the mount for a slave cylinder
in my 59. The Tremec's bearing retainer had to be machined for the spacer ring to fit, but it is not giving me any problems (just tossin' this out in case you want to go hydraulic clutch)

The truck engine will have an 8" dia harmonic balancer and a 14" Flywheel or flexplate.

You will most likely want the bell (either the GM 621 or the truck bell with spacer) for the larger clutch.

Last edited by Bryan59EC; 12-11-2009 at 03:11 PM.
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Old 12-10-2009, 04:15 PM
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Here's the link to the adapter I found.
http://advanceadapters.com/product/2...r-Bushing.html
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Old 12-10-2009, 04:42 PM
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Thanks for the info and the links. Appreciate all the help. Atually I was thinking about a hydraulic clutch. Timely.
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Old 12-10-2009, 06:07 PM
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sb chevy question

Hi zeke51 thats a great start there for your project, you have numbers on those parts to id them...wwwmortec.com .. I have hyd on a 52 coupe ( 87 gm truck slave/master ) trans am pedals. Good Luck 327 350hp
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Old 12-10-2009, 07:35 PM
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Ronbo---
How is that thing supposed to stay in place???
Only way I can see it being done is by drilling holes in it and tapping the bell housing for a set screw.

If one was to drill and tap the ring----could possibly distort the ring when it was secured. (pilot now off center)

Roll pins would pretty much make it non removable
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Old 12-11-2009, 11:29 AM
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If you use a standard washer on the bearing retainer nose piece, the washed needs to be trimmed, ground off. With the ring, the washer was just fine. Depending on you clearance, ring to bearing retainer, you may need to heat the ring for a shrink fit. My clearance was not tight so I just used washers on the four bolts. Hope this helps.
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Old 12-11-2009, 03:13 PM
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Never even thought of that!
Actually, that's pretty slick
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