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Username Post: 383 VS 396 SBC        (Topic#174332)
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-09-07 02:58 PM - Post#1292482    

Hi guys, I want to build a second engine for my car,its a kit AC Cobra 1150kgs, tremec 600 g/box and a 3.54:1 PL diff. I have built a nice 350 chevy with 420hp/415tq. I want some more power!!

What are the pros and cons between a 383 VS a 396??

I have a good second hand 60's block that needs a 30thou rebore and want to fit a stroker kit to it.

I want my power between 2500rpm to 6500rpm.

Is there a special piston required for a 396ci?

Can anyone on help me out with a spec list??

This is what I am thinking.

750 mighty demon carb,
vic jnr intake or air gap intake,
210 afr Eliminator head 75cc chambers
10.5 compression
HYD or solid roller cam 235/240?? Grumpy??
Crane 1.5 rockers
Eagle crank 3,875 forged internal balance
Eagle H beam rods 6"
Forged pistons, flat top?? decked .36 quench??Make??

Your views please.

Thanks.







 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16145
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
11-09-07 03:09 PM - Post#1292490    
    In response to goatlips

383 comonly uses a 3.75" stroke crank, the 396 SBC comonly uses a 3.875" stroke

read thru this

http://airflowresearch.com/articles/article031/A -P...

http://www.adperformance.com/index.php?main_page=p...

http://www.speedomotive.com/ps-527-85-395cid-raci n...

http://www.ohiocrank.com/chevy_rotating.html


http://www.chevytalk.org/fusionbb/showtopic.php?ti...


I had very good results useing a 10.5:1 cpr and my crane 119661 hydrolic roller cam in my 383, I tried a crower 00471, it made better peak hp, but lost some low rpm driveability, but then I built it to use with a 175-200 hp shot of nitrous and a 3000 stall converter and 3.73:1 rear gear

http://www.cranecams.com/?show=browseParts& ;act...

http://www.crower.com/misc/cam_spec/cam_fin der.php...


a 396 SBC takes a DIFFERANT CONNECTING ROD OR A DIFFERANT COMPRESSION HEIGHT PISTON than a 383 sbc


look over the info and talk to your engine builder and both cam companies about your engine combo, listen to everyone input and make your choices, don,t rule out a health nitrous plate, it does wonders for the power when you really want to get excessive
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 11-09-07 03:32 PM. Reason for edit: No reason given.

 
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-09-07 03:17 PM - Post#1292495    
    In response to grumpyvette

Thanks grumps,I read that a few weeks ago when we last talked about it.

So it would still use the same piston as if it were a 383??

Can you recommed a good company your side of the pond for a stroker kit??

How about a couple of cam choices for me??

 
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-09-07 03:55 PM - Post#1292517    
    In response to goatlips

Yeah I have a nitrous kit fitted aswell,but never used it! Don't think my 350 bottom end is strong enough for it,thats why I am going forged this time.



 
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-09-07 04:04 PM - Post#1292521    
    In response to goatlips

What are your views on this company and rotating kit??

http://www.cnc-motorsports.com/product.asp?ProdID=...



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16145
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
11-09-07 05:53 PM - Post#1292579    
    In response to goatlips

  • goatlips Said:
What are your views on this company and rotating kit??

http://www.cnc-motorsports.com/product.asp?ProdID=...





ID add these options

Kit Upgrades
Eagle H Beam Rods with ARP L-19 Bolts (add $ 85.00)
Internally Balanced Assembly (add $ 110.00)

parts look good , and IVE not heard anything bad about there parts/service, but be sure to verify ballance and clearances and finish on the parts
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 11-09-07 05:55 PM. Reason for edit: No reason given.

 
55chevy383 
Silver Supporting Member
Posts: 1306
55chevy383
Age: 46
Loc: Noble, Ok.
Reg: 12-08-05
11-09-07 06:41 PM - Post#1292602    
    In response to grumpyvette

I have the AFR 210's prior to the eliminator, and the intake ports on the Victor Jr. are smaller than the heads, a better match is the Super Victor, unless you plan on port matching the Victor Jr. intake to the heads. Just wanted to let you know.

Phil
11.66 @ 115 N/A.
Phil's '55


Edited by 55chevy383 on 11-09-07 06:42 PM. Reason for edit: No reason given.

 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16145
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
11-09-07 07:02 PM - Post#1292617    
    In response to 55chevy383

good point!
for some unexplainable reason,I was assuming he had already purchased and currently owns those intakes,and port matched both the intakes listed to match the AFR heads and both were re-used off the current 350sbc
btw if theres GOING TO BE a port mis-match its suggested the intake runner is slighly smaller than the ports in the heads as the minor lip formed tends to slow reversion pulses slightly going back to the plenum and the lip turbulance may help the fuel stay in suspension better
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 11-09-07 07:06 PM. Reason for edit: No reason given.

 
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-10-07 05:05 AM - Post#1292804    
    In response to grumpyvette

I am using a edelbrock air gap port matched to my 195 AFR heads on the 350 chevy. I think I will be better of selling the complete engine as a turn key rather than brake it for spares for my new engine.

I do not have the hood clearance for a super Vic intake,I only have a few MM spare with the airgap fitted as it is.

 
55chevy383 
Silver Supporting Member
Posts: 1306
55chevy383
Age: 46
Loc: Noble, Ok.
Reg: 12-08-05
11-10-07 09:06 AM - Post#1292906    
    In response to goatlips

You'll have to have the Airgap hogged out a little more, as the ports on the 195's are smaller than the 210's. But like Grumpy said, it's better to have the intake smaller, than the head port to be smaller. Also remember, if you have the heads milled down, they'll have to back cut the intake mating surface on the head to avoid sealing issues. AFR does this automatically if you have the heads milled, but it never hurts to ask a reminder question.

Phil
11.66 @ 115 N/A.
Phil's '55


 
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-11-07 05:07 PM - Post#1293749    
    In response to 55chevy383

Do you guys think the 210 afr Eliminator heads will be ok for this build or can someone recommend me something else or something smaller?


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16145
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
11-11-07 06:39 PM - Post#1293827    
    In response to goatlips

Id sellect the AFR 195cc Eliminator heads for that build BUT theres no reason to swap IF youve already got the AFR 210s Eliminator heads, either cylinder head will work, its just each choice has addvantages and disaddvantages due to the design, the advantage of the smaller ports is a trade off that favors the low and mid rpm tq but slightly restricts the upper rpm power the 210cc Eliminator heads ports give you, it depends on what your trying to do, if it was intended to be a nitrous equiped combo engine build with a larger cam durration and more cpr then the 210cc Eliminator heads would be the choice, theres not alot of advantage in the larger ports if the cam youve sellected and lower compression ratio to use pump gas and 3.45:1 rear gearing are restricting there opperational RPM range and flow rates to what the slightly smaller ports can easily supply, making most of the higher flow potential of the larger heads basically unreached and unusable in the current combos peramiters and operational restrictions.
swap to a 250-255 dur @.050 lift, on a 106 LCA and a 12.8:1 cpr and use a super vic intake and 4.56 rear gears and the 210cc heads will be a better choice, but it won,t be street drivable in traffic, or run on pump gas
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 11-11-07 06:52 PM. Reason for edit: No reason given.

 
55chevy383 
Silver Supporting Member
Posts: 1306
55chevy383
Age: 46
Loc: Noble, Ok.
Reg: 12-08-05
11-11-07 06:42 PM - Post#1293829    
    In response to goatlips

Are your AFR 195's in good shape? If so that's a damn good head, and should support over 500 hp. If you build the 383, I'd stay with the 195's, if you build the 396, I'd go with the 210's. If your future plans are going to be to build the motor up with a bigger cam to get more power, the 210's will go farther for you. Just my .02 worth.

Phil
11.66 @ 115 N/A.
Phil's '55


Edited by 55chevy383 on 11-11-07 06:47 PM. Reason for edit: No reason given.

 
goatlips 
Senior Member
Posts: 235

Loc: London UK
Reg: 06-05-05
11-16-07 03:50 PM - Post#1297426    
    In response to 55chevy383

I have not bought any parts yet,my engine block is getting rebored at the moment. My AFR heads are maybe 14 months old with 3K miles on them.

Grumps, this cam http://www.crower.com/misc/cam_spec/cam_fin der.php... You said you lost some bottom end power can you explain a little more in detail?? What RPM did it run badly at??

What HP did it make??

Edited by goatlips on 11-16-07 03:51 PM. Reason for edit: No reason given.

 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 16145
grumpyvette
Age: 66
Loc: FLORIDA USA
Reg: 03-16-01
11-16-07 06:51 PM - Post#1297561    
    In response to goatlips

first keep in mind my car weights at least 700lbs-1000 lbs more than your cobra,and youve got a manual trans Ive got an auto trans thats far less forgiving,im running a highly modified stealthram (EFI TUNNEL RAM),your running carbs, you can use alot more cam than I can ever use, that 00471 cam ran great from about 2600rpm and up, but my current cam pulls from about 2400rpm on up, youll have a differant engine combo with better heads and a larger displacement, your combo should come on slightly faster. you might also keep in mind I built my car mostly for street driving and spirited performance driving, but not as a race combo, I rely mostly on a health dose of nitrous for serious race power and am more concerned with street driving characteristic and don,t have as effective of cylinder heads as your combo.
" " IF YOU CAN'T SMOKE THE TIRES FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK !"


Edited by grumpyvette on 11-16-07 07:04 PM. Reason for edit: No reason given.

 
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