[U00tlc5]

I am running 12.0 at 110 and want to run a 10.90. I have a BBC option or upgrade current SBC.

Vehicle:
- 1953 Ford Truck (pretend it's a Chevy if it bothers you)
- 3500 lb race weight
- TH350 3000 10" Hughes
- 4.56 spool 9" Cal-Trac bars
- Current 377 best 1.63 / 7.57 89 / 12.00 110

SBC option:
- swap from home bowl ported Vortec heads to AFR 195 or 210.
- reuse current SFT 256/264, .545/.563, 105 LSA
- reuse induction - Wieand TR with 2-600 Holleys
- Replace worn Roller rockers with new

BBC option:
- I have a primo stock 454 with 781 ovals.
- Add hyper pistons for 10-10.5:1
- Add Comp SFT 260/266 .629/.605 108LSA
- Add 2.19/1.88 valves and do my own bowl porting.
- Add RPM air gap and 850 dp Holley
- These are the major items. I have left off the small stuff so as not to bore you.

I'm a budget builder and estimate the sbc option at $2400 and the BBC build and swap at $2100.

I want to break into the high tens (knock a good second off my current ET).

This package does not have to last 10 years, 3 would be nice. It will not be daily driven. It does have to drive 60 miles to the track. I only race a few times a year (wish I could every week). I want pump gas. I also plan on a converter upgrade after I decide on the engine.

Let me know which way you think would have a better chance at a 10 second pass.

Tom

 

[Bob West]

Bore the big block .060, go with a solid roller and I'd say you'll get there.

 

[71 chevy]

you already have an sbc. I would stick with the sbc since what you are doing amounts to a headswap.

the bbc might have some hidden costs you have not factored(like a roller cam) etc

 

[aukai]

I would not race hyper pistons, but that is just me....

 

[Stikman33]

If you really thing the BBC would be a cheaper option there is so much more room to grow in that thing. Someday my 427 will turn into a 496 with a crank and pistons

 

[MadmanMark]

My guess is the better heads would get your sbc real close to 10.9x on a good day with good track prep, but it might get stuck in the low 11s at a typical tnt night. Like Daniel said, the sbc doesn't give you as much room for further improvement as the bbc. The bbc option you showed looks like it might be a little more street friendly, since the cams seem similar and the bbc has an extra 77ci.

 

[66 BRONZE]

I am running 12.0 at 110 and want to run a 10.90. I have a BBC option or upgrade current SBC.

Vehicle:
- 1953 Ford Truck (pretend it's a Chevy if it bothers you)
- 3500 lb race weight
- TH350 3000 10" Hughes
- 4.56 spool 9" Cal-Trac bars
- Current 377 best 1.63 / 7.57 89 / 12.00 110

SBC option:
- swap from home bowl ported Vortec heads to AFR 195 or 210.
- reuse current SFT 256/264, .545/.563, 105 LSA
- reuse induction - Wieand TR with 2-600 Holleys
- Replace worn Roller rockers with new

BBC option:
- I have a primo stock 454 with 781 ovals.
- Add hyper pistons for 10-10.5:1
- Add Comp SFT 260/266 .629/.605 108LSA
- Add 2.19/1.88 valves and do my own bowl porting.
- Add RPM air gap and 850 dp Holley
- These are the major items. I have left off the small stuff so as not to bore you.

I'm a budget builder and estimate the sbc option at $2400 and the BBC build and swap at $2100.

I want to break into the high tens (knock a good second off my current ET).

This package does not have to last 10 years, 3 would be nice. It will not be daily driven. It does have to drive 60 miles to the track. I only race a few times a year (wish I could every week). I want pump gas. I also plan on a converter upgrade after I decide on the engine.

Let me know which way you think would have a better chance at a 10 second pass.

Tom

$300 difference to put on KILLER set of AFR heads and keep your sbc, thats a no brainer. You did not mention the time and effort to home port the 781's,and the hidden cost of a new build. I know what its like to home port heads.It was fun (I did a set of "A" casting heads for my BBO/442). Don't get me wrong I am a BB fan but those AFR'S will smack those vortecs,just make sure you use ARP studs. Don't get me going on that one.

 

[steelcomp]

There's no substitute for displacement. Onward and upward.

 

[blue66]

There's no substitute for displacement. Onward and upward.

:yes: x2......except maybe boost!!

BTW it's "No replacement for displacment!" LOL

 

[wildman926]

I just went through this decision, and opted for a BBC, and I already have the AFR 195 Eliminators that have less than 400 miles on them. I am in the process of trading a forged 383 stroker for a forged BBC. The stroker would have recieved my AFR's and would be a killer piece. But, I opted to trade it with it's Sportsman II heads, and keep the AFR's to sell. The BBC comes with 049's as well.

 

[badrad]

There's no substitute for displacement. Onward and upward.

I'll x3 this, plus it leaves room to grow later on, ie better heads and such.

 

[U00tlc5]

Thanks for the input guys. I feel like I would be smarter going BBC, but the challenge of doing it with a SBC is really appealing to me. I kinda like doing more with less.

My small block is only a 2 bolt main, so running 10.90 might be pushing the envelope. That's where the beef of the Big Block starts to make sense.

I don't know if dropping a full second swapping from Vortecs to AFR's is a reasonable expectation.

On the other hand, I'm probably expecting too much out of my porting ability on the big block heads.

 

[Mikeys69]

Being it's a mixed up setup all ready. I would say a LS swap would be perfect. Sell off your SBC to help with the cost over run.
396 or 6.0 undecided: Please read -> http://www.chevelles.com/forums/showthread.php?t=289649

 

[66 BRONZE]

Thanks for the input guys. I feel like I would be smarter going BBC, but the challenge of doing it with a SBC is really appealing to me. I kinda like doing more with less.

My small block is only a 2 bolt main, so running 10.90 might be pushing the envelope. That's where the beef of the Big Block starts to make sense.

I don't know if dropping a full second swapping from Vortecs to AFR's is a reasonable expectation.

On the other hand, I'm probably expecting too much out of my porting ability on the big block heads.

What are the specs of your bottom end ???

 

[onebad82z]

SBC option:
- swap from home bowl ported Vortec heads to AFR 195 or 210.

nd I already have the AFR 195 Eliminators that have less than 400 miles on them... and keep the AFR's to sell.

Hmmm.... anyone else see this match up? PM Walt maybe?

 

[71 chevy]

lol. good catch.

i still say sbc. here are more mild bbcs with factory heads, running 12s than there are running 10.90s

 

[68chevelle533]

To run high 10s you will need to mph in the low 120s probably around 122. To go from 110mph to 122 in a 3600lb car takes an extra 120 or so horsepower. The AFRs will pick you up for sure but it will take more than a head swap to reach your goals.

 

[onebad82z]

To run high 10s you will need to mph in the low 120s probably around 122. To go from 110mph to 122 in a 3600lb car takes an extra 120 or so horsepower. The AFRs will pick you up for sure but it will take more than a head swap to reach your goals.

:yes:

... add a plate!

 

[66 BRONZE]

To run high 10s you will need to mph in the low 120s probably around 122. To go from 110mph to 122 in a 3600lb car takes an extra 120 or so horsepower. The AFRs will pick you up for sure but it will take more than a head swap to reach your goals.

Good call:thumbsup:, Tom just add some NOS. You said you will only be at the track 2 times a year and it's only for 2-3 years so save for your BBC and spray it. I still say stay with the SBC but if its about economics then spray it...

 

[U00tlc5]

Bottom end is a 2 bolt 509 block with stock main bolts, cast crank 0.010 under 3.48 stroke, factory 5.7 "X" rods, beem polished with ARP bolts (skipped the shot peening). TRW forged flat tops (heavy). "Just like they built in the 80's!"

Sound like a 10.90 short block? Maybe for a couple of passes. The timeslip lives forever though!

Saying this outloud makes me think the big block is the smarter choice. I don't want to put much more money into the small block, like splayed caps and lighter pistons.