Edelbrock STR-15-8 Modifications

[Allan Wilkinson]

I have a chance to pick up an Edelbrock STR 15 intake for low deck, and wondering if anyone knows anything about modifing these for better performance? I have heard they will work better on big inch strokers and I would be using it on a 383/496. Ive heard stuff about popsicle sticks, epoxy and jetting. Just a little about the car setup if that helps, 67 Dart, 3.91 gears, manual 727, 2800 stall, and most likely a comp hyd roller 549/.544" lift and 242 intake and 248 exhaust at .050", heads I havent purchased yet but probably victors or trickflows. Will be mostly street use and some 1/4 mile.
I know there are much better alternatives for an intake, but really love the look of a cross ram. Could also use it on a 63 belvedere that I might frankenstein together as a max wedge clone. Any info or suggestions will be appreciated, thanks

 

[66Satellite47]

The old DC manuals have details on their recommendations. No personal experience. Bet it still depends on the carb you use.

 

[lewtot184]

the factory carbs were pretty small and jetting specs wouldn't be relevant with the big inches/cam even if you had them. most of those types of intakes had distribution issues of some sort or another. some guys put pop-off valves in them for the inevitable back fire.

 

[wyrmrider]

you can port them to be equal and do the same as epoxy and popsicle sticks
we even stuck a blower on one- worked great until the backfire
2 AVS
2 TQ
small primaries and big secondaries would be better than a square carb for driving not racing
we ran similar on the Javelin Trans AM car- unfortunately my carb/ tuning expert went to the big pro in the sky
I would not run race car type carbs on the street
plan on doing some tuning

 

[66Satellite47]

you can port them to be equal and do the same as epoxy and popsicle sticks
we even stuck a blower on one- worked great until the backfire
2 AVS
2 TQ
small primaries and big secondaries would be better than a square carb for driving not racing
we ran similar on the Javelin Trans AM car- unfortunately my carb/ tuning expert went to the big pro in the sky
I would not run race car type carbs on the street
plan on doing some tuning

Really good point, an STR manifold is a quirky race piece, you really know WTF you're doing with it.

 

[rlem1977]

You probably can get just as good of performance from either a Edelbrock Torker or Performer RPM or Mopar M-1 with a single Holley. Less complicated, and probably less expensive if you are needing to modify the STR-15. Just a thought.

 

[polyjohn]

Hi Allan, stunning manifold the STR-15-8-bbl.

I have one from the late sixties that was used at Weslake Eng. UK, STR-14-4 dominator, for a development 426 race-engine.
They had a few a few 'fuelling issues' which is documented somewhere in the DC world?
The Weslake/Edelbrock intake was highly modified for the Ovalport heads that were on that engine.


I can show some pictures of the 'internal dams' that were fitted at that time.

The gasket in the last picture is from a W2 set-up, about 25% smaller than the W1 bigblock heads/intake.

The Mopar M1 manifold looks PUNY next to this Edelbrock beauty lol...

 

[Allan Wilkinson]

Thanks for the info. I also have another set-up that may work good. A Spreadbore top plate and kinda rare 1000 cfm Thermoquad (4847SA)