plans for the 400SB, want opinions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue_71 · 07-31-2002, 05:39 PM

bore.30
flat top Keith Black hyperetic alloy pistons
236 @ .050 duration, .510 lift Isky cam
Air Flow Research aluminum heads, 2.02/1.6 valves, stiffer springs (for the higher cam) 1.6 rocker arms, 200CC runners, 68 CC combustion chamber
mid rise intake, not sure which one yet, but Weiand single plane
750 Eldebrock carb
1 7/8 inch stainless steel headers
aftermarket HEI

so thnk my 3500ish lb truck, could take the at least 5000 lb truck that has the twin turbo 460? (its a F350 rollback)

btw, mines a 71 chevy long fleet, NV4500, 3:73 posi (or will be when i race him) with fiberglass doors and hood, ram air hood

68 Suburban · 07-31-2002, 05:48 PM

I think you are going to be boing to the gas pump a lot :p

Super Chevy · 07-31-2002, 06:03 PM

I think youll pass almost anything but a gas station

**MikeB** · 07-31-2002, 06:16 PM

If your truck is primarily street-driven, I'd go with a Performer RPM instead of a single plane. It's good to 6500 RPM and still makes decent low end torque. Those single planes can cause your motor to go "blaaaaah" off idle. I'd also use 1-5/8" or 1 3/4" headers -- the 1-7/8" tubes can really kill low-to-mid throttle response. But, if you've got 4.10 gears and your foot's always in it, who cares? With 68cc chambers and flat top pistons, you're going to have some serious static compression. Be sure to keep the quench height less than .060" to help limit detonation. Don't use a thicker gasket to lower compression. I hear those AFR heads are awesome! I'm thinking about using the 195s next time.

Tracy Focht · 07-31-2002, 06:51 PM

I totally agree with MikeB. I would use the RPM intake, and if you don't have the carb yet, get the Holley #4779 750cfm carb. The Edelbrocks are good daily driver smog carbs, but IMHO suffer in high performance applications.
The 750 cfm Holley will do better. Add a good 2500-3000 stall and hand on!!!!!!!

Blue_71 · 07-31-2002, 06:55 PM

going to get the quench to .040", i prefer Weiand, but i might go with performer RPM

im thinking with the 68 CC heads i should be at 10.45ish compression.
a friend of mine/engine builder really recomends the AFR heads, and yellow72custom was playing with desktop dyno and said they did the best out of all of them.

i think if the 1 7/8 headers kill the low to mid torque, ill go with 1 3/4.. i dont plan on my foot always being in it, and im goign with a 3:73, soooooo

burb, going to be boing to the gas pump? :p

about what octane will i have to run? im thinking 92

the engine builder guy did say that he didnt like Holley, but they were better for high performance.. so i think ill go with it.

Tracy Focht · 07-31-2002, 07:01 PM

Yea, the 1 3/4 headers will be better suited....and 2.5" pipe.

Now, on the carb, I have owned all Demon, Holley, Edelbrock, Q-Jet and so far the Holley has surpassed all of them. Including the Demon.

AFR's are pricey, but some of the best built and flowing heads out there.....good choice!

Super Chevy · 07-31-2002, 07:11 PM

I'm thinking 92 octane and 104+ booster to run that 10.7 comp... mabe mix 115 racing fuel with 87?

Tracy Focht · 07-31-2002, 07:15 PM

My 383 has 10.7:1 compression and I have no vacuum advance, and can run 93 octane all day...but nothing less. If you have aluminum heads, 92-93 octane should be fine.

neonlarry · 07-31-2002, 10:05 PM

For a intake manifold, what about the Weiand Stealth? I am thinking about buying one. They are comparable to the performer rpm, and are good from idle to 6800rpm.

Tracy Focht · 08-01-2002, 11:25 AM

Quote:

Originally posted by neonlarry
For a intake manifold, what about the Weiand Stealth? I am thinking about buying one. They are comparable to the performer rpm, and are good from idle to 6800rpm.

IMHO, the Edelbrock is a better intake..........

neonlarry · 08-01-2002, 04:34 PM

I agree, from what I have heard, the Edelbrock is probably a better intake. I do like the look of the Weiand ones a lot better though

Sierra · 08-01-2002, 07:56 PM

Blue_71, looks like you're on the right track. I've installed one pair of AFR 195 heads on my brother's 406 cid truck and one one my ZZ4 350, with no problems whatsoever. The AFRs run as good as they look, and IMO simply can't be beat. The aluminum heads can endure more compression than iron, but premium fuel is still required (92 octane pump gas should be fine.) Your cam choice looks real good, but be cautious if you insist on using (for whatever reason) 1.6 rockers, as max lift for these heads with the standard AFR springs is 0.550". 1.6 rockers will also be noticeably noiser. You mentioned optional springs, but they aren't necessary for the street and are really hard on the valvetrain. I run and also recommend the excellent Performer RPM Air Gap intake; however, your choice of carbs is all up to you (too much controversy on this!). Good luck with your engine and I hope this helps.

07-31-2002, 05:48 PM	#2
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	I think you are going to be boing to the gas pump a lot :p __________________ Just sitting here contemplating contemplation.

07-31-2002, 10:05 PM	#10
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	For a intake manifold, what about the Weiand Stealth? I am thinking about buying one. They are comparable to the performer rpm, and are good from idle to 6800rpm. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

08-01-2002, 04:34 PM	#12
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	I agree, from what I have heard, the Edelbrock is probably a better intake. I do like the look of the Weiand ones a lot better though __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

07-31-2002, 06:03 PM	#3
Super Chevy Registered User Join Date: Feb 2001 Location: Ohio Posts: 1,025	I think youll pass almost anything but a gas station

07-31-2002, 06:16 PM	#4
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,599	If your truck is primarily street-driven, I'd go with a Performer RPM instead of a single plane. It's good to 6500 RPM and still makes decent low end torque. Those single planes can cause your motor to go "blaaaaah" off idle. I'd also use 1-5/8" or 1 3/4" headers -- the 1-7/8" tubes can really kill low-to-mid throttle response. But, if you've got 4.10 gears and your foot's always in it, who cares? With 68cc chambers and flat top pistons, you're going to have some serious static compression. Be sure to keep the quench height less than .060" to help limit detonation. Don't use a thicker gasket to lower compression. I hear those AFR heads are awesome! I'm thinking about using the 195s next time. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

07-31-2002, 06:51 PM	#5
Tracy Focht Registered User Join Date: Dec 1999 Location: Stillwater, OK 74075 Posts: 2,936	I totally agree with MikeB. I would use the RPM intake, and if you don't have the carb yet, get the Holley #4779 750cfm carb. The Edelbrocks are good daily driver smog carbs, but IMHO suffer in high performance applications. The 750 cfm Holley will do better. Add a good 2500-3000 stall and hand on!!!!!!!

07-31-2002, 07:01 PM	#7
Tracy Focht Registered User Join Date: Dec 1999 Location: Stillwater, OK 74075 Posts: 2,936	Yea, the 1 3/4 headers will be better suited....and 2.5" pipe. Now, on the carb, I have owned all Demon, Holley, Edelbrock, Q-Jet and so far the Holley has surpassed all of them. Including the Demon. AFR's are pricey, but some of the best built and flowing heads out there.....good choice!

07-31-2002, 07:11 PM	#8
Super Chevy Registered User Join Date: Feb 2001 Location: Ohio Posts: 1,025	I'm thinking 92 octane and 104+ booster to run that 10.7 comp... mabe mix 115 racing fuel with 87?

07-31-2002, 07:15 PM	#9
Tracy Focht Registered User Join Date: Dec 1999 Location: Stillwater, OK 74075 Posts: 2,936	My 383 has 10.7:1 compression and I have no vacuum advance, and can run 93 octane all day...but nothing less. If you have aluminum heads, 92-93 octane should be fine.

08-01-2002, 07:56 PM	#13
Sierra Registered User Join Date: Nov 2000 Location: Victoria, Texas Posts: 71	Blue_71, looks like you're on the right track. I've installed one pair of AFR 195 heads on my brother's 406 cid truck and one one my ZZ4 350, with no problems whatsoever. The AFRs run as good as they look, and IMO simply can't be beat. The aluminum heads can endure more compression than iron, but premium fuel is still required (92 octane pump gas should be fine.) Your cam choice looks real good, but be cautious if you insist on using (for whatever reason) 1.6 rockers, as max lift for these heads with the standard AFR springs is 0.550". 1.6 rockers will also be noticeably noiser. You mentioned optional springs, but they aren't necessary for the street and are really hard on the valvetrain. I run and also recommend the excellent Performer RPM Air Gap intake; however, your choice of carbs is all up to you (too much controversy on this!). Good luck with your engine and I hope this helps.



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