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Author Topic:   what heads to run
brdhil
Dirt Full Roller

Total posts: 26
posted December 21, 2004 06:19 PM  
355 sbc we run dish pistons.. 400 lift cam.. 4 Qjet. stock exhaust.. (RULES) .what would be the best head to run. must be 1.94/1.50 . does anyone know the casting # head that would work best for this combo?? thanks

Cally66
Dirt Full Roller

Total posts: 65
posted December 21, 2004 06:54 PM  
can you use 305 heads it will up your compression

brdhil
Dirt Full Roller

Total posts: 26
posted December 21, 2004 08:11 PM  
yes we can can run 305 heads does anyone know casting #??

racinrobb2003
Dirt Roller

Total posts: 12
posted December 21, 2004 08:29 PM  
quote:
Originally posted by brdhil:
355 sbc we run dish pistons.. 400 lift cam.. 4 Qjet. stock exhaust.. (RULES) .what would be the best head to run. must be 1.94/1.50 . does anyone know the casting # head that would work best for this combo?? thanks

yOU COULD USE THE (305)HEAD FROM G.M.But the flow of this head is no good with out a lot of machine work.witch mean's more money! Thier are some #50 head's that will work for you and flow better than most station wagon head's.014,441,441x,882,624(350 style)all much better head,s with less workIt's not a dream if your living it.Live too race!!!!

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racinrobb

BrianW
Dirt Freak

Total posts: 385
posted December 22, 2004 12:54 PM  
why not mill the piston a little to reduce some of the dish, then zero-deck to the new piston height, and then run a vortec head? The vortec's flow real well for an "unmodified" head, have the smaller valves and with a little "creativity" on the stock parts you can get your compression up.

If you're not going to deck the block then at least run the steel shim headgasket to get the compression up - every little bit helps!

LUBEGUY07
Dirt Freak

Total posts: 302
posted December 22, 2004 02:12 PM  
with that small of a cam i would run vortec heads they seem to work good on low lift cams i think casting numnbers is 906

[This message has been edited by LUBEGUY07 (edited December 22, 2004).]

mrteeshot
Dirt Maniac

Total posts: 127
posted December 22, 2004 08:12 PM  
to use the vortec heads -- do you have to use a special intake or can any cast iron intake work with them ?

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racing is way too cool gave up golf for it

http://chasinracin.com/cgi-bin/showpage.pl?ID=on_my_6

racer17j
Dirt Forum Champ
Total posts: 5390
posted December 22, 2004 08:40 PM  
quote:
Originally posted by racer17j:
you can use the old style intakes but you have to make new bolt holes .try to find some camel humps then you get the compression and the flow try going to www.mortec.com they have listing of chevy casting numbers and some specs for them with the humps you won't have to worry about the intake

You *can* use the intake, but you've got port match problems - if you're looking for a good combo use the chevy vortec intake - it's got a chevy factory part number but was never installed on a passenger vehicle (i.e. depends on the rules if they allow or disallow it...) If you can't run them then you can run the older intake re-drilled but you'll have a big 'lip' at the port due to the port mismatch - a quickie port-match would clean some of it up, but the best is the vortec specific intake.

The Vortec's flow WAY better on the low lift numbers than the old 'humps - with a cam that small the flow at the high lift numbers won't do him any good since the cam won't take advantage of it. The vortec combustion chamber is a much better design for a low compression engine and would make better hp and torque than any doublehump could with these rules... Heck - most engine builders have flowed these heads a lot better than the bowtie heads at lifts under .500"

If he could run high-rise single plane intake, port the heads to the max and run the 2.02 valves but was limited to stock castings then go for a set of
modified 'humps.

nailngoracing
Dirt Maniac

Total posts: 170
posted December 29, 2004 09:45 PM  
go to www.castheads.com

they have intakes for votec's

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