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#1 |
Registered User
Join Date: May 2011
Location: Mayflower,AR
Posts: 802
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Need help with accessory hole probs
so im looking at beefing my 350 up abit. its got average heads on it. i have a/c and the alt bolted to my heads. im looking for some double humps now to bump some power, but most of them dont have accessory holes and id like to have my a/c system on my truck. any suggestions? and who all has had experience with the smallest of the thumpr cam from comp? im looking for double humps, new springs, thumpr cam, i have an aluminum intake, and prob a 650-750 carb, whats the hp roughly? and anyone with the small thumper and 58cc 305 ho heads? thanks, mike
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-Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s |
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#2 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Need help with accessory hole probs
Im running the 279 thumr with vortec heads. I have a vodoo cam that should be here tomorow sometime to swap it out. Its been broken in and always changed with the zinc VR1. When I pull it i'll keep the lifters in order so someone can use it. If your interested i'll cut you a great deal when I get it pulled (soon?
![]() If I were you id shoot for something more performance oriented..
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#3 | |
Registered User
Join Date: May 2011
Location: Mayflower,AR
Posts: 802
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Re: Need help with accessory hole probs
Quote:
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-Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s Last edited by sir_talk_alot; 02-08-2012 at 11:04 AM. |
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#4 |
Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: Need help with accessory hole probs
I have not done it personally, but it is my understanding that accessory holes can be drilled and tapped by a machine shop. You might be better off buying some complete performance heads through Summit for example. You might end up cheaper than buying the double hump heads and then having the machine work done on both the accessory holes and valves. Another choice might be Vortec heads but you will need to have an intake that is made to fit the vortecs. I sold a set of double humps a couple of years ago for just this reason.
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1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
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#5 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Need help with accessory hole probs
I agree with the aftermarket heads.The choices are wide and you can probably buy a set for just about what a set of heads and machine work will cost you.Check with the head co and see what will work well for your situaton.You might also look at the Edelbrock kits that have cam,heads intake and carb.They're matched to give X HP for the application.You could probably sell the stuff you have to help offset the cost.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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