BB 402 questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JQ-72** · 09-16-2002, 08:56 PM

I have a 402 out of a '72 3/4 ton Cheyenne. I ran the #'s on the front of the block in the "Chevy red book" (TKX) and it checked out. I have the motor on an engine stand and noticed "pass. high per." on the back of the block. Also, "pass." is stamped on the top side of each head. Were there any differences in intake manifolds? When I bought the truck, the motor had a '69 Chevelle 396/350 factory high rise manifold on it. The guy I bought it from threw in a '71 BB intake manifold. I put the '71 manifold on and it did not cover up the water ports in the middle of the heads but all the bolt holes line up. Last, what is the best way to get old crusty auto paint off a motor while leaving it assembled? Thanks for any help.
Joshua

Dean23 · 09-16-2002, 09:05 PM

To take off old crusty paint, I used an aircraft spray on paint stripper. Spray it on let sit then wire brush it with gloves on it is like an acid. Then hose well with warm water and a varsol sprayer. then blow dry. prime it and then paint it. thats what I did to my 350

primered

painted and parially dressed

breeh · 09-16-2002, 09:20 PM

Don't worry about those "water ports" in the center because they are not water ports. What you see exposed there is correct.

71402BB · 09-16-2002, 09:48 PM

Pass hi perf on the back of th block is normal to see. I belive that all BB blocks say this on the back (correct me if I'm wrong). Pass on the heads just me that there just stock truck (penut port) BB heads. Which means there nothing special now if the heads said pass hi perf on them then that would mean that you had a set of High proformace heads whice would not have come stock on any of the BB's put in are trucks (to my knowledge). Hope this was of some help................ Brian

breeh · 09-17-2002, 10:57 AM

"Pass" on the heads indicates oval port heads. They are not necessarily peanut port however.

1-PU70 · 09-17-2002, 12:03 PM

You have regular oval port heads not small oval or beanut heads because they didnt make small oval heads till 1975. Hope that helps. I have a BB from the same truck and year and mine hast the same thing cast on block and head. Good luck.

71402BB · 09-17-2002, 05:36 PM

My bad, and thanks for correcting me.

09-16-2002, 08:56 PM	#1
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,625	BB 402 questions I have a 402 out of a '72 3/4 ton Cheyenne. I ran the #'s on the front of the block in the "Chevy red book" (TKX) and it checked out. I have the motor on an engine stand and noticed "pass. high per." on the back of the block. Also, "pass." is stamped on the top side of each head. Were there any differences in intake manifolds? When I bought the truck, the motor had a '69 Chevelle 396/350 factory high rise manifold on it. The guy I bought it from threw in a '71 BB intake manifold. I put the '71 manifold on and it did not cover up the water ports in the middle of the heads but all the bolt holes line up. Last, what is the best way to get old crusty auto paint off a motor while leaving it assembled? Thanks for any help. Joshua

09-16-2002, 09:05 PM	#2
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	To take off old crusty paint, I used an aircraft spray on paint stripper. Spray it on let sit then wire brush it with gloves on it is like an acid. Then hose well with warm water and a varsol sprayer. then blow dry. prime it and then paint it. thats what I did to my 350 primered painted and parially dressed __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

09-16-2002, 09:20 PM	#3
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	Don't worry about those "water ports" in the center because they are not water ports. What you see exposed there is correct. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

09-16-2002, 09:48 PM	#4
71402BB now thats a true COON DOG Join Date: Nov 2000 Location: Franconia, NH Posts: 1,977	Pass hi perf on the back of th block is normal to see. I belive that all BB blocks say this on the back (correct me if I'm wrong). Pass on the heads just me that there just stock truck (penut port) BB heads. Which means there nothing special now if the heads said pass hi perf on them then that would mean that you had a set of High proformace heads whice would not have come stock on any of the BB's put in are trucks (to my knowledge). Hope this was of some help................ Brian __________________ current project 67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!) 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well... 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)

09-17-2002, 10:57 AM	#5
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	"Pass" on the heads indicates oval port heads. They are not necessarily peanut port however. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

09-17-2002, 12:03 PM	#6
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	You have regular oval port heads not small oval or beanut heads because they didnt make small oval heads till 1975. Hope that helps. I have a BB from the same truck and year and mine hast the same thing cast on block and head. Good luck. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

09-17-2002, 05:36 PM	#7
71402BB now thats a true COON DOG Join Date: Nov 2000 Location: Franconia, NH Posts: 1,977	My bad, and thanks for correcting me. __________________ current project 67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!) 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well... 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)



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