exaust problems........ - The 1947 - Present Chevrolet & GMC Truck Message Board Network

special70gmc · 05-27-2003, 09:00 PM

-im installing ths engine for this guy down the road from me and im replacing a 79 350 with a 72 invader 350 out of a work van. the engine is clean!!! for 1972 btw. but heres the prob he exaust manifolds from the 79' wont fit the heads on the 72 ???? i thought all sbc's were the same theres an 18 inch off both back cylinders the bolts are far from lined up. i can only get 4 bolts in on either side im confused

-kyle

Blackhawkdc · 05-27-2003, 10:00 PM

how far off are the other two bolt holes? The manifold may have contracted. You can get expanders from a tool dealer

Longhorn Man · 05-27-2003, 11:46 PM

I have had this happen myself, it was a pain, but i got all the bolts in eventually. Try getting all of them in about 4 threads, and if you get them all started, then spin each one down a little bit untill your done.
When i installed the caddy engine I coulda sworn the 472 manifolds were not the same as the 425...but it was just from heat cycling.

05-27-2003, 09:00 PM	#1
special70gmc Registered User Join Date: Sep 2002 Location: long island, new york Posts: 1,333	exaust problems........ -im installing ths engine for this guy down the road from me and im replacing a 79 350 with a 72 invader 350 out of a work van. the engine is clean!!! for 1972 btw. but heres the prob he exaust manifolds from the 79' wont fit the heads on the 72 ???? i thought all sbc's were the same theres an 18 inch off both back cylinders the bolts are far from lined up. i can only get 4 bolts in on either side im confused -kyle __________________ 1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door

05-27-2003, 10:00 PM	#2
Blackhawkdc 440 american Horses Join Date: Mar 2001 Location: Anoka, MN USA Posts: 470	how far off are the other two bolt holes? The manifold may have contracted. You can get expanders from a tool dealer __________________ Seth Petro 1969 Chev Short Step 425hp 350, TH400, big tires, fast truck 1979 Pontiac Trans Am 1991 Saturn SL1 - gas mileage! (and free) 1977 Buick LeSabre - for sale May America bless God, and may God bless America

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05-27-2003, 11:46 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	I have had this happen myself, it was a pain, but i got all the bolts in eventually. Try getting all of them in about 4 threads, and if you get them all started, then spin each one down a little bit untill your done. When i installed the caddy engine I coulda sworn the 472 manifolds were not the same as the 425...but it was just from heat cycling.



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