engine help!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Eyegore · 05-04-2004, 01:58 AM

hey guys i wont lie im no engine buff so how do i tell if my engine is a 305 or a 350 with out major engine disassembly, any help plz!!! thx Garrett, buy the way you guys hear my 82 was stolen?? (if you dont remember the truck it was the one with the girl layin behind it in the pic!!) bummer huu

Russell · 05-04-2004, 02:32 AM

That truck was awesome

I was so sad when I heard it got stolen, and yes, I've been keeping my eyes open up here.

One easy way to find out -- Look at the exhaust manifolds, if the exhaust goes up then down, it is a 305, if the manifolds go straight down, then it is a 350 (aka, the manifold on a 305 looks upside down, so the cast metal part goes overtop of the plugs, while on a 350, they go underneith)

Tom · 05-04-2004, 03:17 AM

look on the back side of the block on the drivers side. Right behind where the oil pressure sending unit normally goes. you'll see a pad with casting numbers. If its a 350, it will just have ########, if its a 305 it will have "5.0" cast in along with the #####

PHOENIX · 05-04-2004, 01:15 PM

I wouldnt use the exhuast manifolds method.
Previous owner(s) may have used the manifolds off the 305 for the new 350.
I know I used the same manifolds when I went from 305 to 350.

Cole's 87 · 05-04-2004, 01:23 PM

Do like I did when I first got my 87 when it had the orginal motor I pulled the valve cover off and looked up the casting # on the head.

05-04-2004, 01:58 AM	#1
Eyegore What Hump? Join Date: Apr 2003 Location: New River AZ Posts: 2,009	engine help!! hey guys i wont lie im no engine buff so how do i tell if my engine is a 305 or a 350 with out major engine disassembly, any help plz!!! thx Garrett, buy the way you guys hear my 82 was stolen?? (if you dont remember the truck it was the one with the girl layin behind it in the pic!!) bummer huu __________________ Lil red 86 c-10 99 Sub 78 Camper Special w/ 454

05-04-2004, 02:32 AM	#2
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	That truck was awesome I was so sad when I heard it got stolen, and yes, I've been keeping my eyes open up here. One easy way to find out -- Look at the exhaust manifolds, if the exhaust goes up then down, it is a 305, if the manifolds go straight down, then it is a 350 (aka, the manifold on a 305 looks upside down, so the cast metal part goes overtop of the plugs, while on a 350, they go underneith) __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

05-04-2004, 03:17 AM	#3
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	look on the back side of the block on the drivers side. Right behind where the oil pressure sending unit normally goes. you'll see a pad with casting numbers. If its a 350, it will just have ########, if its a 305 it will have "5.0" cast in along with the ##### __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

05-04-2004, 01:15 PM	#4
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	I wouldnt use the exhuast manifolds method. Previous owner(s) may have used the manifolds off the 305 for the new 350. I know I used the same manifolds when I went from 305 to 350. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

05-04-2004, 01:23 PM	#5
Cole's 87 Registered User Join Date: Nov 2002 Posts: 272	Do like I did when I first got my 87 when it had the orginal motor I pulled the valve cover off and looked up the casting # on the head.



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