LT4 intake differences

[jcunningham57]

bought a gm lt4 intake but the intake runners are smaller than my factory roadmaster intake what the f@!? Ive read up on it got two answers say runners are .100 to .250 which one is right.Ive measured with a tape measure seem to be the same on runner length.No 1/16 to 1/4 difference.The guy i bought it from said he had the sides machined to fit his lt1 heads.I have 195 trick flows I want it to breathe at its best,w/ a52mm t.b.

[ZR1BLAZER]

sounds like someone sold you a standared LT1 intake painted red and called it an LT4 intake. but with some port work on the intake runners and the throttle body side it will flow just as good if not better then the LT4 intake.

[Melonhead]

sounds like someone sold you a standared LT1 intake painted red and called it an LT4 intake. but with some port work on the intake runners and the throttle body side it will flow just as good if not better then the LT4 intake.

X2 on this. Looks like you were sold the wrong intake. Hope you didn't spend too much for it.

You can get the gaskets for the LT4 and port match to that. The best way, would be to match the heads. Take a manila folder and use bolts to hold the folder over the intake holes. Take a ball pean hammer and slowly tap out the shape of each port and bolt hole. It is best to do all the bolt holes first and use bolts to stop the folder from moving. Once you have your pattern, port the runners on the intake to match. the pattern can be used to verify the second head is the same and use the same pattern for both sides. Good luck.

[jcunningham57]

Part #12550631 looks to be factory powder coat.I know that the factory lt4 didnt have a egr cause of the cam profile?I think it might be a summit intake?

[harleyboy]

this is the summit intake.
http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D7109&N=700+115&autoview=sku

[jcunningham57]

its not an edelbrock