sbc #434 heads any good? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vk_chevy · 04-30-2006, 12:11 PM

are there any flow rates or specs available for the the SBC #354434? Mortec says it't a 75-79...262/267/305...60cc chamber.

Any body got any more info?

Thanks

crazy longhorn · 04-30-2006, 03:27 PM

Good heads on a 283/305/307, but a little small on the valves/runners on the larger sb mills.....

L

**dennislbrooks** · 04-30-2006, 05:21 PM

Are these the 74-76 262 monza heads-- I ran them on a 283 -- I believe it lowered compression on my 283 to around 9-1. They have the hardened valve seats for unleaded.

crazy longhorn · 04-30-2006, 05:57 PM

They should be the same comp ratio on a 283, as the old "520" casting was (60cc power pac head). the old 4 brl 283's didnt run too bad

L

vk_chevy · 04-30-2006, 10:06 PM

I was thinking about using them on a mild 350 but sounds like I should keep looking...

67_C-30 · 04-30-2006, 11:01 PM

Quote:

Originally Posted by vk_chevy

I was thinking about using them on a mild 350 but sounds like I should keep looking...

They actually work great on MILD 350, if that's what you want. I would avoid them with flat-top pistons though. You'll have a hard time running them with today's junk pump gas. I have built several 350's with 305 heads (#416 and #434 castings usually) and they are very torquey. They usually have 1.72 or 1.84 intake valves and 1.50 exhaust. This makes great low end throttle response, but hurts upper end RPM, if that's what you want. I put a set of '71 Impala for a customer recently with stock 4 bbl and headers and it made a ton of difference in how the car ran. The #478 heads that came off the engine are some of the best flowing open chamber heads there are (along with #441's), and flow much better than #416's I put on it, the but the 76cc chambers with dished pistons were killing it! Aerohead sells 305 heads with the combustion chambers cut to 64cc, with 1.94 or 2.02 valves ready to run for around $500. Here's their info if you are interested.

Aerohead Racing Components
Indianapolis, IN 46239
317-862-0223

ureckme · 05-01-2006, 01:38 AM

My 355ci sb crate engine came with #434 heads 194 160 with port work was 422@5600 rpm but there thin castings

04-30-2006, 12:11 PM	#1
vk_chevy Registered User Join Date: Jan 2004 Location: Olympia, WA Posts: 231	sbc #434 heads any good? are there any flow rates or specs available for the the SBC #354434? Mortec says it't a 75-79...262/267/305...60cc chamber. Any body got any more info? Thanks __________________ 72 Chevy C20 Longhorn 72 Chevy, K20 Custom Camper 67 Chevy, LWB, C20, 350/350, PS, PB, 65 Jag MKII

04-30-2006, 03:27 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Re: sbc #434 heads any good? Good heads on a 283/305/307, but a little small on the valves/runners on the larger sb mills..... L __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

04-30-2006, 10:06 PM	#5
vk_chevy Registered User Join Date: Jan 2004 Location: Olympia, WA Posts: 231	Re: sbc #434 heads any good? I was thinking about using them on a mild 350 but sounds like I should keep looking... __________________ 72 Chevy C20 Longhorn 72 Chevy, K20 Custom Camper 67 Chevy, LWB, C20, 350/350, PS, PB, 65 Jag MKII

05-01-2006, 01:38 AM	#7
ureckme ureckmefixit2@cox.net Join Date: Dec 2004 Location: Mesa AZ. (Phoenix) Posts: 1,284	Re: sbc #434 heads any good? My 355ci sb crate engine came with #434 heads 194 160 with port work was 422@5600 rpm but there thin castings __________________ That's U RECK ME FIX it 2 74 Chevy Short Bed 355ci Sportsman II 64cc Angle Plug Crower Custom Grind .462in .486ex Dyno Test 422hp @ 5600 And it's got a Holley 3.73 Gears 12 Bolt 3.73 w/Posi 700R4 Going In I'm a Body Man So There! That's why it's not painted

04-30-2006, 05:21 PM	#3
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,764	Re: sbc #434 heads any good? Are these the 74-76 262 monza heads-- I ran them on a 283 -- I believe it lowered compression on my 283 to around 9-1. They have the hardened valve seats for unleaded.

04-30-2006, 05:57 PM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Re: sbc #434 heads any good? They should be the same comp ratio on a 283, as the old "520" casting was (60cc power pac head). the old 4 brl 283's didnt run too bad L __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....



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