What to do - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Domingo · 09-13-2018, 02:17 PM

Last night was adjusting the valves and guess what #2 exhaust valve does not open as much like the rest. Flat lobe. Engine is a sbc 350 I replaced rings bearings gaskets I did a budget rebuild. To do it right I got to pull the engine out and do a complete tear down and cleaning. I also have a little 307 that came in the truck for some reason I want to build it the only drawback on the 307 it has a piston ridge which will need new over size piston more $$$. what should I do 307 or the 350. I would like a efficient v8 maybe 300hp. Both would get a set off heads from jegs or summit

**1968k20** · 09-13-2018, 02:22 PM

350

Domingo · 09-13-2018, 03:27 PM

Any tricks on removing and installing the engine, truck has a sm465 transmission. I've done a buch of automatic transmission but never a manual

jessemthompson · 09-13-2018, 03:55 PM

I would definitely rebuild the 350 over the 307. 300 hp with a set of aftermarket heads will be easy with the 350. Check out some vortec heads. They’ll require a different intake, but they flow really well. Do your research first though, the factory vortec heads require some machining to take lift over .460. The aftermarket ones may not. A small cam and vortec heads would make more than the 300 you’re after. As far as R&R tips, I like to pull the engine and trans as a unit. To me it’s easier.

**clay68c10** · 09-13-2018, 05:51 PM

If you can find one for a good deal, run a later vortec 350 block (880 casting). No more worries about a flat cam, and you get the good heads with it. In stock configuration it will move your truck along nicely.
You're looking at a rebuild anyway, this is a better foundation.

**AussieinNC** · 09-13-2018, 08:16 PM

Totally agree on getting yourself a used Vortec style 350 as a starter for the build....

Better heads
Roller style cam (no more flat lobes)
One piece rear main oil seal

As mentioned, you will need a different intake but the Vortec style 350 is the best choice by far...

Have fun

saxart · 09-13-2018, 10:36 PM

Quote:

Originally Posted by Domingo

Any tricks on removing and installing the engine, truck has a sm465 transmission. I've done a buch of automatic transmission but never a manual

Do NOT try to pull the engine and trans out in one swipe. You'll have to remove the trans first, then pull the engine. The transmission is about 1" too tall to fit between the bottom of the cab and the transmission crossmember. Been there, done that, got the greasy T-shirt to prove it.

Domingo · 09-14-2018, 01:27 AM

Can i leave the transmission in place?

09-13-2018, 02:17 PM	#1
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	What to do Last night was adjusting the valves and guess what #2 exhaust valve does not open as much like the rest. Flat lobe. Engine is a sbc 350 I replaced rings bearings gaskets I did a budget rebuild. To do it right I got to pull the engine out and do a complete tear down and cleaning. I also have a little 307 that came in the truck for some reason I want to build it the only drawback on the 307 it has a piston ridge which will need new over size piston more $$$. what should I do 307 or the 350. I would like a efficient v8 maybe 300hp. Both would get a set off heads from jegs or summit

09-13-2018, 03:27 PM	#3
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: What to do Any tricks on removing and installing the engine, truck has a sm465 transmission. I've done a buch of automatic transmission but never a manual

09-13-2018, 03:55 PM	#4
jessemthompson Registered User Join Date: Nov 2011 Location: Williamsburg, VA Posts: 960	Re: What to do I would definitely rebuild the 350 over the 307. 300 hp with a set of aftermarket heads will be easy with the 350. Check out some vortec heads. They’ll require a different intake, but they flow really well. Do your research first though, the factory vortec heads require some machining to take lift over .460. The aftermarket ones may not. A small cam and vortec heads would make more than the 300 you’re after. As far as R&R tips, I like to pull the engine and trans as a unit. To me it’s easier.

09-13-2018, 05:51 PM	#5
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,979	Re: What to do If you can find one for a good deal, run a later vortec 350 block (880 casting). No more worries about a flat cam, and you get the good heads with it. In stock configuration it will move your truck along nicely. You're looking at a rebuild anyway, this is a better foundation. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

09-13-2018, 08:16 PM	#6
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,204	Re: What to do Totally agree on getting yourself a used Vortec style 350 as a starter for the build.... Better heads Roller style cam (no more flat lobes) One piece rear main oil seal As mentioned, you will need a different intake but the Vortec style 350 is the best choice by far... Have fun __________________ Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox

09-13-2018, 02:22 PM	#2
1968k20 Senior Member Join Date: Dec 2009 Location: Chester,California Posts: 5,629	Re: What to do 350 __________________ 1977 Chevrolet K10 SWB Project 350/4spd/np205 1977 Chevrolet K20 LWB 350/350/203 1991 4Runner 22RE 5 SPD Yanmar Tractor 3 Cyl Diesel

09-14-2018, 01:27 AM	#8
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: What to do Can i leave the transmission in place?



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