[ajp454]

Need some opinions on my 496. Will be a street/strip motor in my full weight 69 chevelle. Eagle stroker kit on a .60 over 454. 049 heads with 2.19 1.88 valves aluminum not in my budget right now. Edelbrock rpm manifold with a Holley 850dp. 1 7/8 hooker headers. Compression is around 9.6 to 1 with a .039 gasket. No port work done to heads other than bigger valves. Thinking of going with a comp cams solid 260/[email protected] .629/.629 on a 110 Lsa. http://m.summitracing.com/parts/cca-11-220-4 the car is a 4 speed car close ratio muncie with 4.11 gears out back. How does this sound Anny suggestions? How much power might I be making? I'd like low 11s maybe high 10s at the track.

 

[Indiansprings]

Cam is to big and you will pick up A LOT of power with some port work.
Pretty much the same engine I have but my cam a hyd roller and is on the mild side. I have 049 irons with 2.25 intake valves and a great porting job done on mine. Same compression.

 

[badrad]

Overall, I like the build but I would use a cam with more split duration.

 

[cstraub]

You need more headers for any power over 6000 rpm. If you want to turn it to 5700 or so the headers are fine. Cam needs more split, less duration if max is 6000 rpm and a tighter lobe sep.

 

[pauls72]

Cam def needs more split. Have a little port work done and have straub grind a cam if you can. Overall I like the combo as well.

 

[ajp454]

Cam is to big and you will pick up A LOT of power with some port work.
Pretty much the same engine I have but my cam a hyd roller and is on the mild side. I have 049 irons with 2.25 intake valves and a great porting job done on mine. Same compression.

Contemplating having them ported just don't wanna invest the same amount of money into them as aluminum heads

 

[steelcomp]

Contemplating having them ported just don't wanna invest the same amount of money into them as aluminum heads

Key here is the cam. Go with Chris' recommendations, leave the heads, save your $$. You can make some real fun, real respectable power with those heads with the right cam.
JMO

 

[ajp454]

You need more headers for any power over 6000 rpm. If you want to turn it to 5700 or so the headers are fine. Cam needs more split, less duration if max is 6000 rpm and a tighter lobe s

What durarion/ lift grind do you suggest with my setup? Thinking i might need to shift up around 6500 to not be outta breath by the end of the 1/4 mile either that or cut back on my rear gear ratio. Like to keep the 4.11s though

 

[ajp454]

Key here is the cam. Go with Chris' recommendations, leave the heads, save your $$. You can make some real fun, real respectable power with those heads with the right cam.
JMO

Im thinking so but if i can do a little.clean up mysefl it probaly wont hurt too

 

[pauls72]

Im thinking so but if i can do a little.clean up mysefl it probaly wont hurt too

Sometimes it can if you don't know what your trying to do

 

[cstraub]

We just had a set of home ported BBC aluminum heads on he bench. From factory stock the heads are down 20 cfm from .300 to .600 average.

 

[Indiansprings]

We just had a set of home ported BBC aluminum heads on he bench. From factory stock the heads are down 20 cfm from .300 to .600 average.

What did the guy look like when you broke the news to him.

 

[pauls72]

We just had a set of home ported BBC aluminum heads on he bench. From factory stock the heads are down 20 cfm from .300 to .600 average.

There you go right there lol.

 

[cstraub]

What did the guy look like when you broke the news to him.

He hasn't picked them up yet so he doesn't know.

Similar thing happened with a set of AFR's. Customer bought them "ported" by someone and they had killed the flow on them.

 

[72BBMonte]

He hasn't picked them up yet so he doesn't know.

Similar thing happened with a set of AFR's. Customer bought them "ported" by someone and they had killed the flow on them.

They also put steeper valve angle on heads which shows better flow at high lift but low lift suffers. They also wear faster. Cars may or may not run better after novice port and valve job work.

The guys that said "cam" are right imho. No OEM heads work well with a single pattern cam and that one is too big for your combination anyway. imo.

Have fun.

 

[dtrubey]

Do talk to Chris. There are a lot of good running 496's here without a bunch of head work done and his cams!!

 

[ajp454]

He hasn't picked them up yet so he doesn't know.

Similar thing happened with a set of AFR's. Customer bought them "ported" by someone and they had killed the flow on them.

Maybe I'll leave them alone then! Haha

 

[ajp454]

They also put steeper valve angle on heads which shows better flow at high lift but low lift suffers. They also wear faster. Cars may or may not run better after novice port and valve job work.

The guys that said "cam" are right imho. No OEM heads work well with a single pattern cam and that one is too big for your combination anyway. imo.

Have fun.[/QUOT

Any suggestions on a cam profile?

 

[pauls72]

That's where you need to talk to Chris. I would think hell use about a 12* split

 

[ajp454]

That's where you need to talk to Chris. I would think hell use about a 12* split

Sent chris a pm