Looking for more from crate motor?
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
Looking for more from crate motor?
Got a 77 with a Blueprint 396 smallblock crate engine. Looking for more low end torque.( never enough right?) Also have a duntov diffy with 4 11s. I know that I'm limited from certain things because it will void a warranty. Would love some advice.
Race Director
Joined: May 2006
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do you have total mechanical advance set for 34 degrees like Blueprint suggests?
what intake and carburetor?
http://www.blueprintengines.com/inde...-base-bp3961ct
what intake and carburetor?
http://www.blueprintengines.com/inde...-base-bp3961ct
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
do you have total mechanical advance set for 34 degrees like Blueprint suggests?
what intake and carburetor?
http://www.blueprintengines.com/inde...-base-bp3961ct
what intake and carburetor?
http://www.blueprintengines.com/inde...-base-bp3961ct
Racer
Joined: Jul 2013
Posts: 307
Likes: 19
From: Kirkland WA
I have a crate motor 385 with a similar cam and 1.6 roller rockers. It dyno'd 486hp and 503tq. With your 396 I might assume you could pick up noticeable torque throughout the rpm range with 1.6 rockers. Might be your best bang for the buck at this point if everything else is flowing well.
Steve
Steve
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Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
I have a crate motor 385 with a similar cam and 1.6 roller rockers. It dyno'd 486hp and 503tq. With your 396 I might assume you could pick up noticeable torque throughout the rpm range with 1.6 rockers. Might be your best bang for the buck at this point if everything else is flowing well.
Steve
Steve
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 113
From: Michigan
Too big if it's a street car, 1-3/4 would be better, 1-5/8 and you'd loose a bit of top end but have a lot more low end torque and since your not using a single plane I'm gonna say your not racing only with a high stall.
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
Considering the 1200 dollars I just spent on the Doug's side pipes, I would like to avoid changing headers.the intake came on the engine. Are you saying a single apllies more low end torque and the 2800 was bps reccomended stall
Racer
Joined: Jul 2013
Posts: 307
Likes: 19
From: Kirkland WA
http://blueprintengines.com/index.ph...-base-bp3961ct Just make sure we're talking about this same build.
these heads can take up to .575 lift so with the cam they've described (.510 intake and .520 exhaust @1.5) you can use the 1.6 rockers to arrive at a total of .544 intake and .555 exhaust lift. I don't know if you need to change out the pushrods but maybe one of the head/cam gurus can speak on that.
Last edited by Silvertone; Dec 29, 2015 at 07:23 PM.
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
Based on the data at:
http://blueprintengines.com/index.ph...-base-bp3961ct Just make sure we're talking about this same build.
these heads can take up to .575 lift so with the cam they've described (.510 intake and .520 exhaust @1.5) you can use the 1.6 rockers to arrive at a total of .544 intake and .555 exhaust lift. I don't know if you need to change out the pushrods but maybe one of the head/cam gurus can speak on that.
http://blueprintengines.com/index.ph...-base-bp3961ct Just make sure we're talking about this same build.
these heads can take up to .575 lift so with the cam they've described (.510 intake and .520 exhaust @1.5) you can use the 1.6 rockers to arrive at a total of .544 intake and .555 exhaust lift. I don't know if you need to change out the pushrods but maybe one of the head/cam gurus can speak on that.
Racer
Joined: Jul 2013
Posts: 307
Likes: 19
From: Kirkland WA
I think this idea has potential for better mid-range torque, which is what I'm after on the street. If you're truly talking about "low-end" like under 2500 rpm then you won't get much out of it. Best to check with Blueprint for fitment and torque potential. I don't want you to run into pushrods rubbing the head or guideplates or anything like that. Not being familiar with your specific heads, all I can see is they flow a little less than my Profiler 195s.
Fortunately its not a Ford, so you shouldn't have piston to valve interference but again it depends on the piston they've used.
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
Sure you want low end and not more power period?
Your car is a little heavy but wiht those gears are you even able to hook up period?
Unless you got into porting heads, more cam converter single plane etc or dropping compression and adding a small blower..money money money
Never enough is it? Theres always a 421, 427, 434 etc
Wish there was more info on those heads
Maybe do your 200r4 &converter first then see how it runs
Your car is a little heavy but wiht those gears are you even able to hook up period?
Unless you got into porting heads, more cam converter single plane etc or dropping compression and adding a small blower..money money money
Never enough is it? Theres always a 421, 427, 434 etc
Wish there was more info on those heads
Maybe do your 200r4 &converter first then see how it runs
Last edited by cv67; Dec 29, 2015 at 08:02 PM.
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
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From: Carrollton, Georgia
Single plane add low end torque?
Race Director
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From: Corsicana, Tx
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Before I started changing things...I'd look into the overall tune of the thing. Not sure who makes the heads...but if they are close to the airflow listed...they should do OK for street playing. The cam is the most suspect. Lots of duration for a HR with next to nothing on lift. That insinuates long, slow lazy lobes. Any idea of the LSA of the cam?
Which 750 Holley carb? Mechanical or vacuum secondary? Have you verified timing?
As mentioned...with 4.11's and a 2800 converter...you ought to be launching like crazy especially on drag radials.
I don't think rockers are going to change the world on that cam...but since the ones on it at stamped it says...no telling what they are actually getting at the valve.
Headers aren't so bad for a 396" engine. What size are the internal dimensions of the sidepipes?
JIM
Which 750 Holley carb? Mechanical or vacuum secondary? Have you verified timing?
As mentioned...with 4.11's and a 2800 converter...you ought to be launching like crazy especially on drag radials.
I don't think rockers are going to change the world on that cam...but since the ones on it at stamped it says...no telling what they are actually getting at the valve.
Headers aren't so bad for a 396" engine. What size are the internal dimensions of the sidepipes?
JIM
Thread Starter
Racer
Joined: Apr 2015
Posts: 412
Likes: 12
From: Carrollton, Georgia
Before I started changing things...I'd look into the overall tune of the thing. Not sure who makes the heads...but if they are close to the airflow listed...they should do OK for street playing. The cam is the most suspect. Lots of duration for a HR with next to nothing on lift. That insinuates long, slow lazy lobes. Any idea of the LSA of the cam?
Which 750 Holley carb? Mechanical or vacuum secondary? Have you verified timing?
As mentioned...with 4.11's and a 2800 converter...you ought to be launching like crazy especially on drag radials.
I don't think rockers are going to change the world on that cam...but since the ones on it at stamped it says...no telling what they are actually getting at the valve.
Headers aren't so bad for a 396" engine. What size are the internal dimensions of the sidepipes?
JIM
Which 750 Holley carb? Mechanical or vacuum secondary? Have you verified timing?
As mentioned...with 4.11's and a 2800 converter...you ought to be launching like crazy especially on drag radials.
I don't think rockers are going to change the world on that cam...but since the ones on it at stamped it says...no telling what they are actually getting at the valve.
Headers aren't so bad for a 396" engine. What size are the internal dimensions of the sidepipes?
JIM
And the cam spec is listed by Blueprint at 110* lsa