[dboyett38606]

I was at a local body shop the other day and spotted a big block chevy engine,when I asked what they where doing with it they told me it was going to the scrap yard.So the next day I went to buy it and the son the owner didn't know what it was,and he sold it to me for a 100 dollars complete engine.I had already ran the eng. numbers on it so I gave it to him,It turned out to be a std. 454 4 bolt main with dimple rods,he said the guy ran it hot,and it did have a blow-ed headgasket,but its now at the machine shop,and the crank was new bearings rings all looked new,I'm having it bored,decked,cam bearings,freeze plugs pretty much everything.What I was wondering what would be a good combo that could get my 70 model camaro in the high 10s? I know I'm gonna run alum. heads ,and probably domes,but I still want it to run on pump gas(prem) any info would help on other engines you have built.This is my first bbc,and I want to make a killer engine out of it thanks for reading

 

[54truck]

Did you have it checked to sure that the block is not cracked? That is the first thing I would do before I spent money on it. Bud

 

[dboyett38606]

Did you have it checked to sure that the block is not cracked? That is the first thing I would do before I spent money on it. Bud

ye its done i'm going to get it in the morning

 

[mynuffinfutsitch]

buy you some brodix bb2 xtra heads
run some dished pistons
put a cam with around 260 duration @.050 and .600-.750 lift
some good forged internals would be a good idea
also stroking it to a 496 would be a good idea also

you could also think about spraying it or using a 6-71 or 8-71 blower

run some 3.73 or 4.11 gears in it, and maybe a 4000 rpm stall converter

your car should be able to run in the 10s and be pump gas friendly with some of these combos

 

[CptKaos]

My current project is a 496 stroker motorics in photo gallery
Scat crank and rods
Brodix BB 2 Plus heads
Comp roller rockers
Doug Herbert solid roller cam (CBH7), lifters and pushrods
SRP small popup pistons which with these heads 10.3 to 1 CR
EdelBrock RPM airgap intake
850 Mighty Demon
MSD E-curve dist

 

[firestone]

There are a couple of things to consider. In order to get the motor to make the power you are after, you are probably looking at a max RPM of 6500-7000 RPM. That being the case, I would recommned getting an aftermarket rotating assembly. If you end up doing that, I would recommend building a 496. Once you get into aftermarket parts, it really does not cost much more to stroke it. If you are after something a little less expensive, I would look at using as much of your rotating assembly as you can and using a set of ported 049 or 781 heads. With a mid 240's at .050 ~.600 lift cam You could make around 550-600 hp @ 6000-6300 RPM with that setup. If you went with the 496, I would recommend the 315cc AFR heads and a solid roller cam in the mid 250's at .050 duration ~.650 lift. With that setup and 10.5:1 compression, I think you would be in the 700-750 range at ~6500-6700 RPM.

Here is a motor I just built and what power it should make:


496
9.5:1
248 254 @.050 ~.600 lift solid flat tappet cam
victor jr port matched to heads
fully ported oval 049 heads with 2.19 1.88 valves.
This motor should be around 600 hp/600 ft lbs pretty easily

This is a motor my friend built:

461
9.5:1
242 248 @ .050 .600 lift hyd roller cam
Victor Jr intake ported
cleaned up 781 oval heads 2.19 1.88 valves
This motor made 560 hp @6100 RPM/560 ft lbs with 20w50 oil on an engine dyno.

These show what the AFR 315cc heads are capeable of:

512 ci
~9:1 (would be a better match with 10.5:1)
254 260 @.050 .660 lift solid roller cam
victor jr intake
AFR 315cc heads

741 hp @ 6400 RPM 690 ft lbs @ 5100 RPM
http://airflowresearch.com/articles/article052/A-P4.htm

496 cid
10.4:1
255 265 @.050 .629 .629 lift hyd roller cam
holley single plane intake
AFR 315cc heads
Fuel injected

728 hp @ 6800 RPM 645 ft lbs @ 5400 RPM
http://airflowresearch.com/articles/article071/A-P1.htm

My motor is not in my car, so I dont know what it will do in the 1/4, but I have heard of combinations similar to mine in novas running really low 11's on drag radials and full exhaust

Adam

 

[ratlover]

don't intend to hijack the thread, but where do these blocks typically crack?

 

[dboyett38606]

i Don know i have never seen one crack. Well I got the block,and new pistons they have a .230 dome its 30 over,I'm thinking of using a set of pro-comp alum. heads I am going to port match the intake to the heads,and a little port work on the heads I am using a victor junior intake,but I haven't decided on the cam. I got a crane hi-drallic roller off ebay with 632" of lift on the intake,and exhaust.I'm not sure if I'm going to use it though.Has anyone ever ran these pro comp heads I looked at the flow nubers and they look really good what do you guys think?

flow #'s
Lift Int Ex
.100 74.3 62.0
.200 166 118
.300 245 160
.400 308 195
.500 340 229
.600 360 248
.700 375 265

 

[xntrik]

Remember, famed builder Steve Henderson said many times......

"You can build a 475 hp engine with a fuel problem, or a 450 hp engine that will run on junk."

 

[firestone]

I just have a couple of questions,

What size runner do those pro comp heads have?
what is the duration @.050 on that cam?
How much do the heads cost?

Adam

 

[dboyett38606]

I just have a couple of questions,

What size runner do those pro comp heads have?
what is the duration @.050 on that cam?
How much do the heads cost?

Adam

the runners are 320cc the chambers are 115cc

 

[firestone]

I have never used those heads, but I have heard from one head guy that they were not worth buying. I dont know what is bad about them, but usually, you get what you pay for. Below is a link to a similar combo where they were brought up. I realize that this is just one guys opinion, but he does a lot of head work, and it is all I have really heard about them.

http://forums.racingjunk.com/viewtopic.php?t=1902&postdays=0&postorder=asc&start=15

Adam

 

[65 Imp SS]

If you look at Car Craft mag. of March of 2007 they have an article of a 496 on pump gas and also the dyno results and engine spec's.

 

[firestone]

There have been some more replys about the heads you are looking at on the link above if you wanted to see them.

Adam

 

[dboyett38606]

There have been some more replys about the heads you are looking at on the link above if you wanted to see them.

Adam

Thanks i wonder how he knows about these heads I'm not going to run them this is why i love this site

 

[mynuffinfutsitch]

I have never used those heads, but I have heard from one head guy that they were not worth buying. I dont know what is bad about them, but usually, you get what you pay for. Below is a link to a similar combo where they were brought up. I realize that this is just one guys opinion, but he does a lot of head work, and it is all I have really heard about them.

http://forums.racingjunk.com/viewtopic.php?t=1902&postdays=0&postorder=asc&start=15

Adam

Where i work at the guy who builds racing motors (Oakley Racing Motors) told me you have to do alot to get power out of AFR heads than Brodix or Dart Heads

actually since ive been working there, i NEVER seen AFR heads yet, Only Brodix,World,Dart, and i think some Trick Flows

http://webpages.charter.net/joeoakley/18889328407_0_ALB.jpg

i think thats a 8 sec motor (for a s10) with Brodix heads
Joe (who builds the motors) is on the phone.

at the shop now they have a bbf with prototype heads from brodix

 

[firestone]

I beleive that,to say you need to do a lot of work to a set of AFR's to get them to make power compared to Brodix or Dart is simply not true. If anything, it is the other way around. AFR's big selling point is that you have the option of buying them fully CNC ported. If you compare an out of the box CNC'd AFR 357 compared to an out of the box as cast Dart 360, the AFR's would have a huge advantage. I realize that this is comparing a CNC'd head to an as cast head, and that the AFR's are $3100 a set whereas, for example, the 345's are only $2600 out of Jegs, but to get the as cast Dart or Brodix head close to the AFR, you would need to do considerable porting; it would probably cost upwards of $1000. Chances are you will have more money in the Dart or Brodix heads in the end for about the same performance. Dart and Brodix both make CNC versions of their heads, but from all that I have seen they are about the same as or more expensive than AFR's. The Dart 355 CNC heads are $3652 for a set and the Brodix BB2 EXTRA CNC 355 heads are $2950 a set, both out of Jegs, some of the deviation of the price of the Darts is due to different parts used in the heads though. The thing is, AFR probably has a leg up on the other cylinder head compaines when it comes to CNC porting. They have been doing it since the late 70's. Dart and Brodix make great heads, but when it comes to bang for the buck, I have yet to see a set of BBC heads that outperform AFR.

Here is a little AFR history
http://www.airflowresearch.com/about.php

Adam