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Username Post: Intake manifold that matches the double hump heads intake??        (Topic#365492)
Sabelstrom 
Newbie
Posts: 17

Age: 37
Loc: Sweden
Reg: 05-10-21
06-11-21 11:42 AM - Post#2821490    

Hi.

I need a intake manifold that fits the ports on mu double hump 3782461 heads.

The intake ports are 50.30mm x 28.77mm something like 1.98" x 1.13".

Is there a intake manifold that match the ports?

If not I have read it’s important that the intake manifold has smaller ports then the heads, something about turbulence with sharp corners and edges.

The engine (327 with full roller) has dyno results 360hp @ 5700rpm with Edelbrock C3B intake with intake ports 49.45mm x 32.0mm (not a good match)

I have three intake manifolds on the shelf:
Edelbrock C3B intake with intake ports 49.45mm x 32.0mm (1.95" x 1.26")
Holley 300-38 Street Dominator with intake ports 43.2mm x 27.0mm (1.69" x 1.08")
Edelbrock performer 2101 47.75mm x 28.96mm (1.88" x 1.14")

I don’t have the time or tools to port the heads, but I can port a intake manifold.

Any suggestions on intake manifold, or a manifold that I can port to match the heads?
Or is it overrated to match the manifold to the heads with only 360hp?




 


grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17648
grumpyvette
Age: 73
Loc: FLORIDA USA
Reg: 03-16-01
06-11-21 01:53 PM - Post#2821493    
    In response to Sabelstrom

minor mis-matches in the port shape, in height or width are NOT critical, and I certainly would not be very concerned with minor mis-matches, now if you can match the ports it certainly won't hurt, to do so, but its really not critical.
find the closest intake gasket in port size, and use it as a guide to match the ports to as close as possible

COMMON SBC INTAKE GASKET PORTS
felpro # 1204=Port Size: 1.23" x 1.99"=2.448 sq inches

felpro # 1205=Port Size: 1.28" x 2.09"=2.67 sq inches

felpro # 1206=Port Size: 1.34" x 2.21"=2.96 sq inches

felpro # 1207=Port Size: 1.38" x 2.28"=3.146 sq inches

felpro # 1209=Port Size: 1.38" x 2.38"=3.28 sq inches

felpro # 1255 VORTEC=Port Size: 1.08" x 2.16"-2.33 sq inches

felpro # 1263=Port Size: 1.31" x 2.02"=2.65 sq inches

felpro # 1266=Port Size: 1.34" x 2.21"=2.96 sq inches

felpro # 1284 LT1=Port Size: 1.25 x 2.04''=2.55 sq inches

felpro # 1289 FASTBURN=Port Size: 1.30" x 2.31" 3.00 sq inches

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 06-11-21 02:11 PM. Reason for edit: No reason given.

 
69_BOWTIE 
Senior Member
Posts: 1134

Loc: WYOMING,USA
Reg: 02-27-02
06-11-21 06:24 PM - Post#2821500    
    In response to grumpyvette

I run the Edel. performer on both my 327/461 humpers and not a problem.

2001 Silverado 4X4
2005 FXDWGI
69 CHEVY Short Step
63 IMPALA 2/DR HRDTOP 327


 
Rick_L 
Member #409
Posts: 27879
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
06-11-21 07:03 PM - Post#2821501    
    In response to Sabelstrom

As a general statement, you'd like for any mismatch in size be from the manifold being smaller than the head.



 
Sabelstrom 
Newbie
Posts: 17

Age: 37
Loc: Sweden
Reg: 05-10-21
06-12-21 10:45 PM - Post#2821547    
    In response to Rick_L

Thanks for all the answers.

Got some answers from Holley. The Weiand Street Warrior 8120WND, 8125 and 8126 have Port Size: 1.84” height 1.12" width. Good enough to port match.

Any toughs on those? My first reaction was the low RPM range, i have stall at 3000 so a higher RPM range should be better, maybe a carb spacer will do the trick?



 
Sabelstrom 
Newbie
Posts: 17

Age: 37
Loc: Sweden
Reg: 05-10-21
06-14-21 02:06 PM - Post#2821599    
    In response to Sabelstrom

I have looked up some dyno test with and without portmatching the intake manifold, its not mush to gain in those cases 1-3% hp.

The dyno test seems to gain more with a good intake like Edelbrock Air Gap 7501 or Edelbrock 2701.



 
rumrumm 
"20th Year" Silver Supporting Member
Posts: 2115
rumrumm
Loc: Macomb, IL
Reg: 10-18-01
06-15-21 06:15 AM - Post#2821623    
    In response to Sabelstrom

If you are thinking of changing intake manifolds, and you are going to drive your car in cold weather, go with the Edelbrock RPM rather than the Air Gap. Air Gaps can be fussy in cold weather.

Lynn

"There's no 12-step program for stupid."


383 sbc, Eagle, AFR, SRP, CompCams, Edelbrock, FiTECH. Dyno #'s: 450 hp @ 5700, 468 lb. ft. of torque @ 4300.



 
Sabelstrom 
Newbie
Posts: 17

Age: 37
Loc: Sweden
Reg: 05-10-21
06-15-21 01:40 PM - Post#2821640    
    In response to rumrumm

Its my summer car, so not in cold weather, 10-35°C usually, don't have a choke on my carb either.





 


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