sellecting cylinder heads



Re: sellecting cylinder heads

Postby grumpyvette » November 24th, 2009, 7:58 am

thanks for the praise, please tell others,


as to the heads the answer depends on what your trying to do, if its just for basic transportation and your not after power those heads are fine as they will without doubt raise the off idle and low range torque due to higher compression, but they will hurt mid and upper rpm power as they don,t breath well.



BTW
NEW/HEADS, you should NOT just bolt them on!

http://forum.grumpysperformance.com/viewtopic.php?f=52&t=389&p=7266&hilit=aluminum+iron#p7266

http://www.carcraft.com/techarticles/ccrp_0602_iron_versus_aluminum_cylinder_heads_test/dyno_results.html


now Ill probably tick some guys off here, but I see enought heads come thru the shop to point out a common problem, and its NOT limited to one or a couple manufacturers, Ive seen it on nearly every brand and type of cylinder head!, what Im referring to is bits of casting flash, bits of aluminum or cast iron chips from machine work or sloppy assembly, burred threads, threads that are not cleanly cut,ETC. on new out of the box cylinder heads, I won,t name brands BUT some of the top names have bits of aluminum chips/dust/crud left in the ports in as shipped heads and dis assembly and use of a stiff tooth brush, high pressure air and carb cleaner spray along with reassembly with the proper lubricants and running a tap thru threads and cleaning all machined surfaces with solvent,is almost mandatory if your don,t want bits of crud washing around in the engine during first starting the engine. it sure doesn,t hurt to check the spring bind and other clearances, and that the valve seals are correctly installed either
IM sure the manufacturers used a high pressure air hose to blow out the ports and water passages, but theres commonly some crud remaining so inspect carefully, and clean those new heads BEFORE installing them
, yes the cheaper brands seem more prone to this problem but even the best brands are commonly seen to be received in less than stellar condition, and need some basic clean-up

BTW, one of these tools comes in handy during the inspection process

Image

http://store.summitracing.com/partdetail.asp?part=WMR%2DW89409&autoview=sku
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: sellecting cylinder heads

Postby grumpyvette » January 31st, 2011, 10:29 am

I get asked all the time which heads to buy, thats a bit like asking me to select your next girl friend without you telling me what factors are important to you.
generally cost is a huge factor and most of us can,t throw buckets of money at problems
most of the stock sbc heads are less than impressive, if your looking to build a killer hot rod engine and aftermarket suppliers like
airflow research,
dart,
brodix,
edelbrock,
trickflow

can supply you with valid options, but don,t get extremely cheap, thinking your current factory heads can be mildly ported to make as much power as the aftermarket castings can,, thats almost always a waste of time and cash, your heads and cam have a huge effect on your engines potential power produced.
assuming your building a common 355-406 sbc and youve got at least the block and crank,to start with,Id suggest you print out a realistic budget for your project and spend 1/3-1/2 on the engine in the heads and cam.
these several threads on matching the port size to the intended use and which intake to buy etc. take the time to do some research before you start writing checks

viewtopic.php?f=52&t=389

viewtopic.php?f=55&t=624&p=11495&hilit=port+area#p11495

viewtopic.php?f=52&t=333

viewtopic.php?f=52&t=4221

viewtopic.php?f=52&t=401

viewtopic.php?f=52&t=3543

viewtopic.php?f=52&t=2110
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: sellecting cylinder heads

Postby grumpyvette » April 15th, 2015, 3:31 pm

http://www.hotrod.com/how-to/engine/ccr ... -shootout/
heres a rather interesting comparison test of cheaper SBC cylinder heads,
notice the SMALL PORT VORTEC HEAD is rather LOW on the list for performance, but the standard 170cc vortec head was designed to maximize low and mid rpm torque not peak power
and some heads were at a disadvantage due to the cam , intake and headers selected to test did not maximize the flow potential.

Sources
Image
Image

Automotive Racing Products; 800/826-3045; ARP-Bolts.com

Dart Machinery; 248/362-1188; DartHeads.com

Edelbrock; 310/781-2222; Edelbrock.com

Federal-Mogul; 248/354-7700; Federal-Mogul.com

Harland Sharp; 440/238-3260; HarlandSharp.com

Jegs; 800/345-4545; Jegs.com

Jim Grubbs Motorsports; 661/257-0101

Patriot Performance; 888/462-8276; Patriot-Performance.com

Scoggin-Dickey Parts Center; 800/456-0211; ScogginDickey.com

Speedway Motors; 402/474-4411; SpeedwayMotors.com

Summit Racing; 800/230-3030; SummitRacing.com

Tri-State Cylinder Head (Flo-Tek); 800/270-0095; TriStateCylinderHead.com

RELATED THREADS

viewtopic.php?f=44&t=10910&p=47875&hilit=215cc+vortec#p47875

viewtopic.php?f=52&t=401

http://www.airflowresearch.com/super-ch ... cc-sbc.php

http://www.profilerperformance.com/raci ... -23-degree

viewtopic.php?f=52&t=534

viewtopic.php?f=52&t=9811

http://www.airflowresearch.com/hot-rod- ... cc-sbc.php

http://www.airflowresearch.com/chevy-hi ... cc-sbc.php
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Posts: 14105
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Re: sellecting cylinder heads

Postby philly » April 16th, 2015, 11:04 pm

what was patriot cylinder heads is now promaxx i believe... for everyones info

http://www.promaxxperformance.com/
-phil

There's never enough money to build it right, but there's always enough to build it twice!
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