Upgrading sbc 327 with crossram and efi

67 rscamaro

Member
I need input from who has done this with old school Sbc 327. Iam not making a strip machine but a streetable car I can enjoy on long hauls. I know sounds odd but a crossram just looks outstanding to me at car shows.
i have a SJ 327 and a offy crossram with dual four top plate.
thinking about Trickflow dhc heads.
advise on cam, which brand efi,
any help is much appreciated
 
We would be interested in this. My uncle is looking to get this Chevy with SJ 327 after we finished brake pads and toyo tires on the Silverado this week. Crossram setup sounds interesting.
 

early 302cubic inch Z28 camaros came with an OPTIONAL extra cost ,dual quad cross ram intake in the trunk,
Ive worked on several in the past and significant power gains could be had, swapping to a cam similar to,
a crane 110921 solid lifter cam,
especially in a larger displacement 11:1 compression engine ,
which was very commonly done, and I built several 377-406 SBC with the cross ram intakes ,
4.11:1 rear gears and muncie 4 speeds, headers etc. which really made the camaros noticeably faster

 

early 302cubic inch Z28 camaros came with an OPTIONAL extra cost ,dual quad cross ram intake in the trunk,
Ive worked on several in the past and significant power gains could be had, swapping to a cam similar to,
a crane 110921 solid lifter cam,
especially in a larger displacement 11:1 compression engine ,
which was very commonly done, and I built several 377-406 SBC with the cross ram intakes ,
4.11:1 rear gears and muncie 4 speeds, headers etc. which really made the camaros noticeably faster

But to make it more highway cruiser, wouldn’t a roller cam be a choice? The bad thing about retiring from the military and staying around fort Benning/Columbus Georgia area is the distance to drive to car shows. 2 hour minimum
 
yeah a roller cam would be better, and something like the crower 00471 RICK used in his T-bucket, used in a in a 327 used as daily transportation, would be rather effective, but those hydraulic roller cams were rare and really expensive back in the early 70s, unlike today,
the crower 00471 RICK used in his T-bucket, would work reasonably well, as a daily driver , while combining good long term durability on a street car, with brisk performance characteristics, obviously the rear gear ratio, should be in the 3.54:1-4.11:1 range, use a 3200 rpm stall converter and over drive ratio auto transmission or manual transmission, large transmission fluid cooler, about 10.5:1-11:1 static compression, low restriction headers and exhaust matching the cam profile helps immensely
and Id suggest two 450 - to 600 cfm max size cfm carbs
 



obviously you have efi options, you should look into the details and discuss the options if going efi
 
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I did pull the trigger on fitech dual efi kit. Had to take advantage of cyber Monday. Also purchased Trickflow DHC heads as well
I know this thread is over two years old, I was wondering how it came out since I picked up an offy intake and I am heading down the same road but with a 408 and ported DHC heads. Any advice would be great!
Thanks!
 
clear pictures would be great?
use of the OFFY intake with the dual EFI throttle bodys,
should be a huge improvement on the ported DHC heads
and much better than hugely restrictive OEM HEADS
obviously youll want a decent fuel pump and fuel lines and fuel filters
 
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Here are the spec’s 408 10.25 or so with heads roller HR cam TKO 600 3.73-3.90 gears
 

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looks like it should result in a rather effective combo with that dual EFI INTAKE,
I don't see any obvious mis-matched components it looks well thought out!
I hope you've got a manual transmission or a 3200 rpm stall speed converter,
and you've used a good set of headers and a low restriction, high flow exhaust?
 
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looks like it should result in a rather effective combo with that dual EFI INTAKE,
I don't see any obvious mis-matched components it looks well thought out!
I hope you've got a manual transmission or a 3200 rpm stall speed converter,
and you've used a good set of headers and a low restriction, high flow exhaust?
Yes 13/4 Hooker Comps custom exhaust 2.5 x pipe Magnaflows. TREMEC TKO 600. Not sure about rear gear set yet
 
none of us had any experience tuning the first time, just read the directions carefully ,
make sure the fuel pressure is correct per those instructions,
and it will certainly help if you have a vacuum gauge and a accurate infrared temp gun,multi meter and fuel pressure gauge
index.php


assuming your referring to throttle body spacers on the cross ram intake ,
Id wait to test adding the spacer unless its needed to mount the twin throttle bodys



 
none of us had any experience tuning the first time, just read the directions carefully ,
make sure the fuel pressure is correct per those instructions,
and it will certainly help if you have a vacuum gauge and a accurate infrared temp gun,multi meter and fuel pressure gauge
index.php


assuming your referring to throttle body spacers on the cross ram intake ,
Id wait to test adding the spacer unless its needed to mount the twin throttle bodys

I have both. Do you know how the SJ 327 Camaro made out with his? On Engine masters they had one one theirs and it gave them better distribution. But those were carbs.
Thanks Jeff
 
I've used the OFFY cross ram intakes with mildly modified 1984 crossfire throttle body injectors and with dual 500 cfm, and dual 600 cfm carbs,
both carbs and throttle body injection on the offy intake, required some tuning effort but both worked out very well.
BTW both worked out better once I raised the fuel pressure just a little bit over what the cars had originally.
be aware some distributors won't fit that intake
an adjustable fuel pressure regulator is useful as is having a fuel pressure gauge you can see while driving to help diagnose any issues that you have.

ofy-5893.jpg

cross-ram-manifold.jpg



 
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This should make the cam card easier to read.

@Updated 67 RS
Right Click on the image, then on the pop up menu click on "Save image as" and browse to where you want to keep the new image. Click "Save"


Lunati_HR_SBC_20129908_543_559.jpg
 
I am sending the intake out for port work in the fall. I am hoping to fill some of the dead spots in the corners and increase response and distribution. Wish me luck.
 
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