engine/tranny compatibility - The 1947 - Present Chevrolet & GMC Truck Message Board Network

94gmc454 · 01-31-2006, 05:25 PM

My 70 GMC came to me with a '78 305 and a TH 350 tranny. It came originally with a 307, and I'm looking at a 307 from a '68 Malibu. Will this bolt up to the '78 TH 350 that's in the truck now? I can get the 307 pretty cheap and it's all redone. (I know the 307 wasn't all that great an engine, but it'll do fine for what I need.)

Pritchard1970 · 01-31-2006, 05:33 PM

It Should Bolt Right Up....i Have A 307 In My Chevelle Wagon 93,000 Original Miles Updated With Ele. Ign. And Edelbrock Carb, That Car Pulls To 100mph Without Problems And Quicker Than Most Might Think

JAKES 68GMC · 01-31-2006, 05:35 PM

There wasn't anything wrong with the 307, it just never had the reputation of a 327 or 350. Its just the middle man between the 283 and 327. Some say it was the greatest small-block ever built. Add a cam, intake and carb, maybe even headers, and it would be a scootin' little engine. Stock form the 307 has 200hp and 300 ft lbs. of torque.

As far as I know, everything should bolt up between a 305 and 307. You may have to change some brackets or something.

94gmc454 · 01-31-2006, 05:38 PM

That's great news, thanks fellas, I really appreciate it!

Tx Firefighter · 01-31-2006, 07:29 PM

It's a straight over swap. No mods needed to brackets or anything.

01-31-2006, 05:25 PM	#1
94gmc454 Registered User Join Date: May 2003 Location: Ithaca, NY Posts: 34	engine/tranny compatibility My 70 GMC came to me with a '78 305 and a TH 350 tranny. It came originally with a 307, and I'm looking at a 307 from a '68 Malibu. Will this bolt up to the '78 TH 350 that's in the truck now? I can get the 307 pretty cheap and it's all redone. (I know the 307 wasn't all that great an engine, but it'll do fine for what I need.)

01-31-2006, 05:33 PM	#2
Pritchard1970 Registered User Join Date: Jan 2006 Location: Elk Grove Posts: 62	Re: engine/tranny compatibility It Should Bolt Right Up....i Have A 307 In My Chevelle Wagon 93,000 Original Miles Updated With Ele. Ign. And Edelbrock Carb, That Car Pulls To 100mph Without Problems And Quicker Than Most Might Think

01-31-2006, 05:35 PM	#3
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,212	Re: engine/tranny compatibility There wasn't anything wrong with the 307, it just never had the reputation of a 327 or 350. Its just the middle man between the 283 and 327. Some say it was the greatest small-block ever built. Add a cam, intake and carb, maybe even headers, and it would be a scootin' little engine. Stock form the 307 has 200hp and 300 ft lbs. of torque. As far as I know, everything should bolt up between a 305 and 307. You may have to change some brackets or something.

01-31-2006, 05:38 PM	#4
94gmc454 Registered User Join Date: May 2003 Location: Ithaca, NY Posts: 34	Re: engine/tranny compatibility That's great news, thanks fellas, I really appreciate it!

01-31-2006, 07:29 PM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: engine/tranny compatibility It's a straight over swap. No mods needed to brackets or anything. __________________ I'm on the Instagram- @Gearhead_Kevin



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