(This is on a roller cam 96 351w long block/e40d with 93 ecu and accessories in a 93 bronco)

I decided to follow the advice of many of one of my previous posts and sold my GT40P heads as well as some funky bbk headers I had sourced for 750, (somehow came out ahead on that deal lmao). I was initially planning to buy the LMR 170cc sve heads, but they were sold out so I ended up getting these funky Chinese vevor 175cc aluminum heads after one of my friends who runs them on a 302 fox recommended them,

Weirdly enough the castings were decent and they fit well, so I guess we'll see how they hold up over the next year or so,

However they have larger ports than the stock E7 heads by far, about 2.100 x 1.280 on the intake side of things best I can tell according to the intake gasket used, the stock efi truck intake is significantly smaller do there's a pretty bad step up, I know the reverse is bad but how bad is this? My guess is its reducing velocity pretty bad and maybe creating a low pressure zone that FUBARS atomization?

I also converted to 1.7 ratio SpeedMaster roller rockers at the same time, despite this the truck actually seems slower below 3000 rpm or so, at which point It seems better than before?

Im planning to go through and do a mild cam and the edelbrock efi intake once I'm back for summer, does anyone know if the Edelbrock ports are any bigger? Or if there's enough material to match them? They don't list the size on Edelbrocks website.

My only other guess for the poor performance would be the ECU throwing a fit as I know the Speed density can be funky at times, anyone here have other ideas?

Does anyone here use the Edelbrock efi truck manifolds? I'm looking at the 3881 model at the moment and I'm wondering if anyone's been able to gasket match it large enough for fel pro 1262 gaskets.

This is the 1262 Gasket over the new mystery Chinese heads

This is a 1262 Gasket over the stock 93 truck intake that I've heard is notorious for poor flow

 

INTAKE MANIFOLD REFERENCE RECOMMENDED GASKET
3881 Edelbrock #7220 Port: 1.20” x 2.00”, .060” Thickness

 

Thank you! I haven't been able to find the port sizes anywhere! Not even on Edelbrocks own website.

In that Case Ill need to match out about a 1/10 of an inch on height which while still quite a bit I think there should be enough material to do that.

 

Its found in the installation instructions PDF file under Product Attachments on Edelbrocks website.

 

You will usually find the Edelbrock 3881 listed as 1.85" x 1.04", but I measured mine at 1.86" x 1.10" before porting. The correct gasket for that intake unported will be the Felpro 1250, but do yourself a favor and buy the 1250-S3. The steel core gaskets don't have the tendency to come apart like the composites. Unless you are planning on porting the intake manifold, you don't need the 1262 gasket, you only need to be slightly larger than the manifold ports. If you do port it, then get the 1262-S3.

 

And also, yes, I use the Felpro 1262-S3 gaskets with my combo. My intake is ported just slightly smaller than the AFR 165 ports.

 

I swear I have a lower Edelbrock truck manifold for a 351w. I know I have the 1262 gaskets too. I will report back later today and see what happens.