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good cam specs for a 496 bbc for dragster
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DRR Trophy
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good cam specs for a 496 bbc for dragster. my combo is a 496 with 4.25 crank 6.385 rod with 43 cc dome piston and right now a set of bb2 xtra 360 heads with sniper jr intake , wanting to run 5.0s with it its a diamond dragster
 
Posts: 166 | Location: tennessee | Registered: November 29, 2008Reply With QuoteReport This Post
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what compression?

FYI, heads and intake manifold are wayyyyy too big!


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

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Posts: 7912 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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yea I know ,trying to find a smaller set but I had them for another short block I was going to buy , should be 13 +
 
Posts: 166 | Location: tennessee | Registered: November 29, 2008Reply With QuoteReport This Post
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on the intake side, 270s @ .050
on the exhaust side about 16 degrees more @ .050 than the intake.

about .760 lift on the exhaust and as much intake lift over .800 as you can get with good P to V clearance

111 LSA


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7912 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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y less exhaust lift
 
Posts: 166 | Location: tennessee | Registered: November 29, 2008Reply With QuoteReport This Post
DRR Trophy
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Ed, what Brodix head do you think would be best on his combination? Not a loaded question.
 
Posts: 42 | Location: Work | Registered: April 12, 2010Reply With QuoteReport This Post
DRR Trophy
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would a bb2 x work .they show 340cc
 
Posts: 166 | Location: tennessee | Registered: November 29, 2008Reply With QuoteReport This Post
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if you already own it yes, if not no.

quote:
Originally posted by JPosey:
Ed, what Brodix head do you think would be best on his combination? Not a loaded question.

this is a 454 and a combo that was the norm 20 years ago. 99% of the BBC race heads on the market now where designed for the larger bore, 4.500+ BBC combo today, not the 4.250+ combos.

My advice is look at heads with a 300-320cc intake runner.

The best head for this bore is a Brodix based casting, CNC'd by Weld Tech but its for a class/displacement specific engine and too costly for bracket racers.

40coupe who posts here on occasional has a stout 468 with AFR 305cc heads IIRC.

I also recommend having whatever head you go with angle milled.

FYI, my 900+ HP 14:1 522 with a 4.560 bore has 329cc heads with a Vic jr. manifold bolted to them and the cam has low 270 duration @ .050 on the intake and mid 280 on the exhaust


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

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Posts: 7912 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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Thanks, I have been following along with of some of the stock block builds as I await mine to be finished. Sorry if I derailed the O.P.
 
Posts: 42 | Location: Work | Registered: April 12, 2010Reply With QuoteReport This Post
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quote:
My advice is look at heads with a 300-320cc intake runner.



I agree with Ed, A small runner can surprise you. Our 3450 lb firebird has been 9.56 @142 mph with a set of Brodix STS-1 CNC heads with only a 305 runner and a .270/.277 / 730 lift cam on a .030 over 454. That's on alcohol, its slower on gas. I figure it makes about 750hp.
 
Posts: 1042 | Location: Monroe twp nj | Registered: December 05, 2005Reply With QuoteReport This Post



DRR Sportsman
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My 498 BBC , 13.5 cr with similar cam specs Ed suggested runs 5.0s in a RED. On gas. The heads are AFR 335 CNC. Keep in mind engines are nothing more than air pumps. The more efficient, the more power.
 
Posts: 423 | Location: Louisville, Kentucky | Registered: August 05, 2003Reply With QuoteReport This Post
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quote:
Originally posted by td9757:
good cam specs for a 496 bbc for dragster. my combo is a 496 with 4.25 crank 6.385 rod with 43 cc dome piston and right now a set of bb2 xtra 360 heads with sniper jr intake , wanting to run 5.0s with it its a diamond dragster


I had this same combination in my SST Camaro and I had a 272/288 775/724 on a 110 installed at 108, alky carb. Went 5.80's and 8.80's at 2800lbs with a 4.30 gear turning about 7200 in the lights


Keeping the Socialists and NEO-LIBERALS at bay with FACTS one post at a time !!!

Providing advice based on WINNING CHAMPIONSHIPS AND RACES across the country in door cars and dragsters from 12 seconds to low 6 seconds in both (not a first round by bye-back window regular at the only track I go to). Providing WINNING ADVICE BASED ON FACTS AND PERSONAL EXPERIENCE ON CARS I WORK ON, OWN AND RACE. Not unsubstantiated opinion I came up with sitting on the toilet.
 
Posts: 2793 | Location: Rockwall, Texas | Registered: June 25, 2002Reply With QuoteReport This Post
DRR Sportsman
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To attain the 5.0s in the 1/8' you mention I would be more interested in what the car weighs race ready with you in it. If it's like these other chromed out 295" candy painted dragsters with 14 batteries, an alternator, air tank, dual brakes, dual chutes, wing, with 16x37" beadlocked steamrollers and a 300 pounder turning the wheel no magic bump stick will get you there!
 
Posts: 481 | Location: here | Registered: February 12, 2006Reply With QuoteReport This Post
DRR Trophy
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My car did go 4.90-5.0 but is a hard tail. My old cam was 284in 294ex @ .050 with .768 and .758 ex lift. The cam I'm going with us 284in and 298 ex with .817 in and .774 ex lift. 505 with 13.5 comp. On gas. Basic light hard tail.
 
Posts: 42 | Location: Work | Registered: April 12, 2010Reply With QuoteReport This Post
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Both way too big @ .050


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7912 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
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posey, what rear gear and how many RPM are you turning it? injected or alky carbed?


Keeping the Socialists and NEO-LIBERALS at bay with FACTS one post at a time !!!

Providing advice based on WINNING CHAMPIONSHIPS AND RACES across the country in door cars and dragsters from 12 seconds to low 6 seconds in both (not a first round by bye-back window regular at the only track I go to). Providing WINNING ADVICE BASED ON FACTS AND PERSONAL EXPERIENCE ON CARS I WORK ON, OWN AND RACE. Not unsubstantiated opinion I came up with sitting on the toilet.
 
Posts: 2793 | Location: Rockwall, Texas | Registered: June 25, 2002Reply With QuoteReport This Post
DRR Sportsman
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Did a 505 couple years ago.AFR 335 ,14CR, Edel 454R ,Cam was 270-284-111.824.760.Made 903 HP at 7100rpms.Bill C.


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Posts: 151 | Location: Paterson N.J. | Registered: September 21, 2006Reply With QuoteReport This Post
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quote:
Originally posted by The Bozman:
posey, what rear gear and how many RPM are you turning it? injected or alky carbed?
I leave at 4400-4600 shift on time usually 7050rpm, cross 7000. 1/8 mile only. Gas 1050 dominator. 4.30 gears, 33.5 tires. Engine is almost ready as its been apart for three years because of timing chain failure.
 
Posts: 42 | Location: Work | Registered: April 12, 2010Reply With QuoteReport This Post
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you're shifting at least 500 RPM too soon with that cam


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7912 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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When it was first built I shifted at 6600 like I did the 427. The more I raised RPM the faster it went. 7150 is highest rpm it has shifted at. I do however have Eagle IMPORT rods and crank. This is only reason I have not tested shifting at higher rpm. If I had to do over it would be something USA made.
 
Posts: 42 | Location: Work | Registered: April 12, 2010Reply With QuoteReport This Post



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