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Author Topic:   what heads to use
nice_guy_wi
Dirt Roller

Total posts: 10
posted September 06, 2002 02:24 PM
Ok we are down to our last race of the year this Saturday night. And as of last night the car is ready to go. So that leaves us looking forward to next year. it's not too early yet right??..lol. So of course the first order of business is playing with all the engine possibilities. We run a more or less stock 350 chevy small block. We built the last engine we put in and are currently running ourselves and are planning on doing the building for next years engines (yeah that's right plural engines)several cars and back up engines. We are by no means engine gurus so that's wher you all come in. How do 305 heads with 1.84 valves and 58cc chambers compare to 35o heads with either 1.94 or 2.02 valves and 76cc chambers. What advantage would one have over the other beside higher compression with the 305 ones. And for building the rest of the engine do they sell actual racing building kits or have to pick and choose the parts one at a time? If so what am I looking for in said parts? Engine rules for our tracks are.....umm how to say it.....pretty wide open. 360 cubic inches max. Everything has to be cast....block,heads,intake and such. We have no cam or compression rules or anything like that that I know of. No dome pistons allowed. Any help or suggestions would be greatly appreciated.....Thanks John that should have been at least as clear as mud right

Merlin
Dirt Full Roller

Total posts: 26
posted September 07, 2002 03:11 AM
if you cannot use higher than 92 octane or so then i would definetly stick with the 350 heads. especially if you can get a set of camel backs or 441 or something like that. Look to see if your rules say anything about vortec heads. if they are legal use em!! the 906 % 062<--(not sure on the second one) are the ones to get. they will outflow any stock unmodified iron bowtie out there. get your block machined to achieve ZERO deck height adn then use about a .035" to .025" thick head gasket. this will get even more compression, plus, having the pistons at zero deck will help prevent detonation. get it balanced if you can and this motor will last a long time.
if you can legally machine the 305 heads for larger valves then those would work well. but not as good as the vortec heads.
to sum it up: get as much compression as you can with as big of valves as you can. Legally of course

rico 08
Dirt Freak

Total posts: 372
posted September 07, 2002 09:42 AM
i'd stay away from the 305 heads they don't flow very well at all and they have a lot of valve guide & cracking problems when abused if u want to stay with stock eary model heads try 993 they are 74cc and flow good also the 882 heads are almost as good and are easy to find if you want more compression put some dome pistons in.

uforacing51
Dirt Freak

Total posts: 349
posted September 07, 2002 03:33 PM
I was going to point out that the 305 heads don't flow as well as the 350 heads, but rico already did that. When my engine swallowed a bolt out of the carb, it ruined the heads (041) my engine builder gave me a list of the best heads for what I was doing and I want to say 882 was on the top. The engine he built runs great now.

[This message has been edited by uforacing51 (edited September 07, 2002).]

Merlin
Dirt Full Roller

Total posts: 26
posted September 07, 2002 09:32 PM
882's and 993's, man you guys were robbed! those are pretty poor heads. 041 is on the right track. i do not know who started the 882 trend but in my opinion they are junk. there are far better heads to be using.

rico 08
Dirt Freak

Total posts: 372
posted September 09, 2002 01:56 PM
MERLIN I AGREE 041 ARE VERY GOOD STOCK HEADS BUT ARE USUALLY HARD TO FIND AND GETTING HARDER SO I USUALLY DON'T EVEN TRY TO FIND THEM OR 292 TURBO HEADS OR BOWTIE'S AND ALSO WHEN YOU DROP A VALVE AND BUST THE TOPS OUT OF THESE RARE HEADS IT WILL MAKE YOU CRY

AC156
Dirt Freak

Total posts: 295
posted September 09, 2002 02:43 PM
in the last issue of circle track, it said that 882 heads are about the worst heads to run.

Merlin
Dirt Full Roller

Total posts: 26
posted September 10, 2002 10:20 PM
YUP, i've seen many many many sets of cracked 882's. i don't know what it is about the casting that went wrong but they are really notorious for it. and the ports seem like they were chiseled out by blindfolded monkeys, kinda rough! Not to mention the HUGE chambers. Bad for racing! if you can run vortec heads them run em!

nice_guy_wi
Dirt Roller

Total posts: 10
posted September 10, 2002 11:26 PM
Merlin

I was reading somewhere that there are 2 types of casts.....a heavy and a light.....the 882's are light ones. I wish I remembered where I read it now.....it told it's heavt cast counter part. But this is why they crack. And from your above post....we have no octane limits. As for the heads what should we expect to pay for a set of double humps? Thanks for the replies guys.

John

Merlin
Dirt Full Roller

Total posts: 26
posted September 11, 2002 09:02 AM
Well....around where i live you could expect to pay about $100 for a set of bare castings. Maybe $275 complete. I'll do some digging on those prices tho. Let me know if you want a pair. My friend is selling a few bare sets.

ray14
Dirt Full Roller

Total posts: 67
posted September 18, 2002 10:00 PM
i just bought a set of 461 for 200 dollars the old bouble humps wwoooooooooooohoooooooooo

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