WTB Big Block Heads - The 1947 - Present Chevrolet & GMC Truck Message Board Network

My72BB · 01-16-2009, 05:57 PM

I need rebuildable or good to go 402 heads...Here are the casting numbers that I am interested in:

353049
3993820
3999241
6272292

All of these are "Open Chamber" and I prefer the last 3 but am open to the first 1 if that is all that comes up.

I have a set of 67-69 "Closed Chamber" casting number 3917215 for a possible trade?

Thanks, Alan

DMARCUM123 · 01-16-2009, 06:01 PM

got some good 781

70rs/ss · 01-16-2009, 06:12 PM

Me too? supposed to be pretty good head for flow??

My72BB · 01-16-2009, 06:31 PM

I guess those would work...do they flow better than the 402 heads??? What kind of condition and what are they worth...?

I am going back to stock except for a RV bumpstick...Even going to a factory low rise if I can find one in good shape.

MarkMark · 01-16-2009, 06:44 PM

Quote:

Originally Posted by DMARCUM123

got some good 781

just curious, what does a nice set 781's go for?

70rs/ss · 01-16-2009, 06:45 PM

3993820....71-84...oval...OPEN...454 Passenger and Trucks, 113cc chamber, 255/114 ports

3999241....72......oval...OPEN...402, 454, 113cc chamber

6272292....70-78...oval...OPEN...402, 454

Here are the 781's #'s:

336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports

As good or better head, a bigger CC but a pop-up style BBC piston will fix that. LMK?

DMARCUM123 · 01-16-2009, 06:46 PM

my 350.00 ready bolt on and go

Willys47 · 01-16-2009, 06:47 PM

I found this in a book I have I hope it will show you that 781 heads are quit a good head

Willys47 · 01-16-2009, 07:05 PM

well It didnt work so that you could read it but with a hydraulic flat tappet cam,seat to seat timming of 15-53-61-19,lift-.453"/.484",lsa-110 they made a 427 with9.5-1 compression and 2.06/1.72 valves on the 1st baseline run max Hp348 at 4500 Tq491at2000 on the test #2 Hp 379 at 4500 Tq 494 at 2000 and with a vale change to 2.19and 1. 88 they made 408 Hp and 496 Tq then they changed the cam and pistons to 11-1 then did 2 more runs on the last run they got 491 Hp at 6000 and the Tq was 495 at 4500 this is with the 781 heads

My72BB · 01-16-2009, 07:43 PM

That looks pretty interesting...Are you pretty savvy in camshafts...The reason I ask is the cams I am considering are: Kinda leaning towards the first one on the list...My truck is BB with 4 speed manual/4:10 gear ratio. Used to have T400 but tired of rebuilding them!

Competition Cam

1. HYDRAULIC-Strong low speed torque, good Hyd. Hyd. 800 to 4800 11-202-3 252H 252 252 206 206 .460 .460 110°
economy. Best in 396-402 c.i., stock
transmission & gear ratios. Very smooth idle.

2. HYDRAULIC-Good torque & power. Excellent Hyd. Hyd. 1200 to 5200 11-203-3 260H 260 260 212 212 .475 .475 110°
towing in 454 c.i. with manual or automatic,
3.73 or higher axle ratios. Smooth idle.

3. HYDRAULIC-Very strong torque, Hyd. Hyd. 600 to 4800 11-230-3 XE250H 250 260 206 212 .470 .475 110º
excellent mileage, smooth idle.

4. HYDRAULIC-Strong torque thru low & Hyd. Hyd. 1000 to 5200 11-234-3 XE256H 256 268 212 218 .480 .485 110°mid-range, good idle.

Thanks, Alan

Willys47 · 01-16-2009, 09:06 PM

I found a site at htt://www.chevytalk.com look for Cam Theory 101 it I hope will take some guessing game out of it for you

My72BB · 01-16-2009, 09:17 PM

Thx for your help...

Willys47 · 01-16-2009, 10:13 PM

http://www.technovelocity.com/chevyh...ation.htm#cams try this link the first one no worky so well

01-16-2009, 05:57 PM	#1
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	WTB Big Block Heads I need rebuildable or good to go 402 heads...Here are the casting numbers that I am interested in: 353049 3993820 3999241 6272292 All of these are "Open Chamber" and I prefer the last 3 but am open to the first 1 if that is all that comes up. I have a set of 67-69 "Closed Chamber" casting number 3917215 for a possible trade? Thanks, Alan

01-16-2009, 06:12 PM	#3
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: WTB Big Block Heads Me too? supposed to be pretty good head for flow??

01-16-2009, 06:31 PM	#4
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Re: WTB Big Block Heads I guess those would work...do they flow better than the 402 heads??? What kind of condition and what are they worth...? I am going back to stock except for a RV bumpstick...Even going to a factory low rise if I can find one in good shape.

01-16-2009, 06:45 PM	#6
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: WTB Big Block Heads 3993820....71-84...oval...OPEN...454 Passenger and Trucks, 113cc chamber, 255/114 ports 3999241....72......oval...OPEN...402, 454, 113cc chamber 6272292....70-78...oval...OPEN...402, 454 Here are the 781's #'s: 336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports As good or better head, a bigger CC but a pop-up style BBC piston will fix that. LMK?

01-16-2009, 06:46 PM	#7
DMARCUM123 Registered User Join Date: Sep 2006 Location: WAYNE, WV. Posts: 675	Re: WTB Big Block Heads my 350.00 ready bolt on and go

01-16-2009, 06:01 PM	#2
DMARCUM123 Registered User Join Date: Sep 2006 Location: WAYNE, WV. Posts: 675	Re: WTB Big Block Heads got some good 781

01-16-2009, 06:47 PM	#8
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: WTB Big Block Heads I found this in a book I have I hope it will show you that 781 heads are quit a good head Attached Images __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!!

01-16-2009, 07:05 PM	#9
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: WTB Big Block Heads well It didnt work so that you could read it but with a hydraulic flat tappet cam,seat to seat timming of 15-53-61-19,lift-.453"/.484",lsa-110 they made a 427 with9.5-1 compression and 2.06/1.72 valves on the 1st baseline run max Hp348 at 4500 Tq491at2000 on the test #2 Hp 379 at 4500 Tq 494 at 2000 and with a vale change to 2.19and 1. 88 they made 408 Hp and 496 Tq then they changed the cam and pistons to 11-1 then did 2 more runs on the last run they got 491 Hp at 6000 and the Tq was 495 at 4500 this is with the 781 heads __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!! Last edited by Willys47; 01-16-2009 at 07:07 PM.

01-16-2009, 07:43 PM	#10
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Re: WTB Big Block Heads That looks pretty interesting...Are you pretty savvy in camshafts...The reason I ask is the cams I am considering are: Kinda leaning towards the first one on the list...My truck is BB with 4 speed manual/4:10 gear ratio. Used to have T400 but tired of rebuilding them! Competition Cam 1. HYDRAULIC-Strong low speed torque, good Hyd. Hyd. 800 to 4800 11-202-3 252H 252 252 206 206 .460 .460 110° economy. Best in 396-402 c.i., stock transmission & gear ratios. Very smooth idle. 2. HYDRAULIC-Good torque & power. Excellent Hyd. Hyd. 1200 to 5200 11-203-3 260H 260 260 212 212 .475 .475 110° towing in 454 c.i. with manual or automatic, 3.73 or higher axle ratios. Smooth idle. 3. HYDRAULIC-Very strong torque, Hyd. Hyd. 600 to 4800 11-230-3 XE250H 250 260 206 212 .470 .475 110º excellent mileage, smooth idle. 4. HYDRAULIC-Strong torque thru low & Hyd. Hyd. 1000 to 5200 11-234-3 XE256H 256 268 212 218 .480 .485 110°mid-range, good idle. Thanks, Alan

01-16-2009, 09:06 PM	#11
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: WTB Big Block Heads I found a site at htt://www.chevytalk.com look for Cam Theory 101 it I hope will take some guessing game out of it for you __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!! Last edited by Willys47; 01-16-2009 at 09:08 PM.

01-16-2009, 09:17 PM	#12
My72BB Registered User Join Date: Oct 2007 Location: Fairfield, PA Posts: 503	Re: WTB Big Block Heads Thx for your help...

01-16-2009, 10:13 PM	#13
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: WTB Big Block Heads http://www.technovelocity.com/chevyh...ation.htm#cams try this link the first one no worky so well __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!!



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.