street demon2k3

iTrader: (3)

my friend has an LT4 intake that was supposedly bought from summit a long time ago. he just has it sitting there and i was wondering how i can tell the difference between his intake and say my painted LT1 intake. i saw the ports on the "LT4" intake and noticed that they look just a little smaller, or not smaller but not as squared. also noticed that one of the bolt holes on the driverside was cut across or elongated towards the valve cover side. both intakes look just about the same except for a few casting #'s on the underside of the manifold. would i be able to bolt it on with any major mods or do i need the LT4 heads as well?

the_merv

iTrader: (88)

The LT4 Intakes are supposed to have taller ports, appx. 2.5mm taller than the LT1's. If it was me, I would bolt a true LT4 Intake to LT4 Heads.

Honda Hunter

iTrader: (8)

Why do you want to bolt it on? Not worth it. If he's giving it to you then take it and through it on ebay.

the_merv

iTrader: (88)

I was looking at that whole LT4 Conversion. It would be cool cause it would be different, but that **** is pricy...

Honda Hunter

iTrader: (8)

It's not different. People have been doing it for years. There is nothing super special about a LT4 intake. The money spent on a LT4 conversion could be better spent on the stock castings and a cam.

street demon2k3

iTrader: (3)

i need to pay off some bills and yes im going to put it up in ebay. just want to make sure it is a legit LT4 intake before i buy it. there are casting #'s on the underside of the inatke and i was wondering if i can identify it using those numbers? or are there any other on the outside of the manifold that will help me tell them apart from other painted intakes? i just saw a few intakes on ebay in the upper $400's and there are still a few days left in the auction.

the_merv

iTrader: (88)

They go for some bucks. Some people pn there list the casting numbers, check with the ones they list.

aggiez28

iTrader: (19)

they have different part #s
im sure you can find the pn for each by doing a search or callign a dealership

brook

street demon2k3

iTrader: (3)

thanks guys i found the part #'s on one of the ebay auctions and it seems like in a few days there will be another one added on there. here's the part #'s

125506030
125506031

i think the top one is from GMPP which you cna buy from any GM dealer and the bottom one is from any corvette i guess that came with the LT4 option. correct me if im wrong.

WHITEBIRD

if you need lt4 heads i have some for sale they are new in the box the heads are complete .

Dragframe

iTrader: (14)

LT4 heads have a better design... so if you want a good combo i wouldb e going with so LT4 AFR heads...

1SLO6

iTrader: (8)

LT4 intake has a taller port..... will not fit on stock LT1 heads. Thats y they sell it as a conversion kit. But besides that the intake u buy from Summit is very crude with small ports ......thats y it is so cheap in price. it will cost u another $150 to $350 to get a good port on it....

z_speedfreak

iTrader: (3)

GM stopped making the LT4 intakes, thats why people pay so much for them

WHITEBIRD

GM is soooooooooooooooooo stupid

urbanhunter44

iTrader: (1)

casting numbers don't lie, they're your best bet for proper identification

street demon2k3

iTrader: (3)

do the small ports on the summit intake make any difference power wise or should they just be gasket matched? just wondering cuz they seem to be real small even compared to my LT1 intake.